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@apollo/server

4.10.3

Patch Changes

  • #7866 5f335a5 Thanks @tninesling! - Catch errors thrown by subscription generators, and gracefully clean up the subscription instead of crashing.

4.10.2

Patch Changes

  • #7849 c7e514c Thanks @TylerBloom! - In the subscription callback server plugin, terminating a subscription now immediately closes the internal async generator. This avoids that generator existing after termination and until the next message is received.

4.10.1

Patch Changes

  • #7843 72f568e Thanks @bscherlein! - Improves timing of the willResolveField end hook on fields which return Promises resolving to Arrays. This makes the use of the setCacheHint method more reliable.

4.10.0

Minor Changes

  • #7786 869ec98 Thanks @ganemone! - Restore missing v1 skipValidation option as dangerouslyDisableValidation. Note that enabling this option exposes your server to potential security and unexpected runtime issues. Apollo will not support issues that arise as a result of using this option.

  • #7803 e9a0d6e Thanks @favna! - allow stringifyResult to return a Promise<string>

    Users who implemented the stringifyResult hook can now expect error responses to be formatted with the hook as well. Please take care when updating to this version to ensure this is the desired behavior, or implement the desired behavior accordingly in your stringifyResult hook. This was considered a non-breaking change as we consider that it was an oversight in the original PR that introduced stringifyResult hook.

Patch Changes

  • #7793 9bd7748 Thanks @bnjjj! - General availability of subscription callback protocol

  • #7799 63dc50f Thanks @stijnbe! - Fix type of ApolloServerPluginUsageReporting reportTimer

  • #7740 fe68c1b Thanks @barnisanov! - Uninstalled body-parser and used express built-in body-parser functionality instead(mainly the json middleware)

4.9.5

Patch Changes

4.9.4

Patch Changes

  • #7747 ddce036e1 Thanks @trevor-scheer! - The minimum version of graphql officially supported by Apollo Server 4 as a peer dependency, v16.6.0, contains a serious bug that can crash your Node server. This bug is fixed in the immediate next version, graphql@16.7.0, and we strongly encourage you to upgrade your installation of graphql to at least v16.7.0 to avoid this bug. (For backwards compatibility reasons, we cannot change Apollo Server 4's minimum peer dependency, but will change it when we release Apollo Server 5.)

    Apollo Server 4 contained a particular line of code that makes triggering this crashing bug much more likely. This line was already removed in Apollo Server v3.8.2 (see #6398) but the fix was accidentally not included in Apollo Server 4. We are now including this change in Apollo Server 4, which will reduce the likelihood of hitting this crashing bug for users of graphql v16.6.0. That said, taking this @apollo/server upgrade does not prevent this bug from being triggered in other ways, and the real fix to this crashing bug is to upgrade graphql.

4.9.3

Patch Changes

  • a1c725eaf Thanks @trevor-scheer! - Ensure API keys are valid header values on startup

    Apollo Server previously performed no sanitization or validation of API keys on startup. In the case that an API key was provided which contained characters that are invalid as header values, Apollo Server could inadvertently log the API key in cleartext.

    This only affected users who:

    • Provide an API key with characters that are invalid as header values
    • Use either schema or usage reporting
    • Use the default fetcher provided by Apollo Server or configure their own node-fetch fetcher

    Apollo Server now trims whitespace from API keys and validates that they are valid header values. If an invalid API key is provided, Apollo Server will throw an error on startup.

    For more details, see the security advisory: https://github.com/apollographql/apollo-server/security/advisories/GHSA-j5g3-5c8r-7qfx

4.9.2

Patch Changes

  • #7699 62e7d940d Thanks @trevor-scheer! - Fix error path attachment for list items

    Previously, when errors occurred while resolving a list item, the trace builder would fail to place the error at the correct path and just default to the root node with a warning message:

    Could not find node with path x.y.1, defaulting to put errors on root node.

    This change places these errors at their correct paths and removes the log.

4.9.1

Patch Changes

4.9.0

Minor Changes

  • #7617 4ff81ca50 Thanks @trevor-scheer! - Introduce new ApolloServerPluginSubscriptionCallback plugin. This plugin implements the subscription callback protocol which is used by Apollo Router. This feature implements subscriptions over HTTP via a callback URL which Apollo Router registers with Apollo Server. This feature is currently in preview and is subject to change.

    You can enable callback subscriptions like so:

    import { ApolloServerPluginSubscriptionCallback } from "@apollo/server/plugin/subscriptionCallback";
import { ApolloServer } from "@apollo/server";

const server = new ApolloServer({
  // ...
  plugins: [ApolloServerPluginSubscriptionCallback()],
});

    Note that there is currently no tracing or metrics mechanism in place for callback subscriptions. Additionally, this plugin "intercepts" callback subscription requests and bypasses some of Apollo Server's internals. The result of this is that certain plugin hooks (notably executionDidStart and willResolveField) will not be called when handling callback subscription requests or when sending subscription events.

    For more information on the subscription callback protocol, visit the docs: https://www.apollographql.com/docs/router/executing-operations/subscription-callback-protocol/

Patch Changes

4.8.1

Patch Changes

4.8.0

Minor Changes

  • #7634 f8a8ea08f Thanks @dfperry5! - Updating the ApolloServer constructor to take in a stringifyResult function that will allow a consumer to pass in a function that formats the result of an http query.

    Usage:

    const server = new ApolloServer({
  typeDefs,
  resolvers,
  stringifyResult: (value: FormattedExecutionResult) => {
    return JSON.stringify(value, null, 2);
  },
});

4.7.5

Patch Changes

  • #7614 4fadf3ddc Thanks @Cellule! - Publish TypeScript typings for CommonJS modules output.

    This allows TypeScript projects that use CommonJS modules with moduleResolution: "node16" or moduleResolution: "nodeNext" to correctly resolves the typings of apollo's packages as CommonJS instead of ESM.

  • Updated dependencies [4fadf3ddc]:

    • @apollo/cache-control-types@1.0.3
    • @apollo/server-gateway-interface@1.1.1
    • @apollo/usage-reporting-protobuf@4.1.1

4.7.4

Patch Changes

  • 0adaf80d1 Thanks @trevor-scheer! - Address Content Security Policy issues

    The previous implementation of CSP nonces within the landing pages did not take full advantage of the security benefit of using them. Nonces should only be used once per request, whereas Apollo Server was generating one nonce and reusing it for the lifetime of the instance. The reuse of nonces degrades the security benefit of using them but does not pose a security risk on its own. The CSP provides a defense-in-depth measure against a potential XSS, so in the absence of a known XSS vulnerability there is likely no risk to the user.

    The mentioned fix also coincidentally addresses an issue with using crypto functions on startup within Cloudflare Workers. Crypto functions are now called during requests only, which resolves the error that Cloudflare Workers were facing. A recent change introduced a precomputedNonce configuration option to mitigate this issue, but it was an incorrect approach given the nature of CSP nonces. This configuration option is now deprecated and should not be used for any reason since it suffers from the previously mentioned issue of reusing nonces.

    Additionally, this change adds other applicable CSPs for the scripts, styles, images, manifest, and iframes that the landing pages load.

    A final consequence of this change is an extension of the renderLandingPage plugin hook. This hook can now return an object with an html property which returns a Promise<string> in addition to a string (which was the only option before).

4.7.3

Patch Changes

  • #7601 75b668d9e Thanks @trevor-scheer! - Provide a new configuration option for landing page plugins precomputedNonce which allows users to provide a nonce and avoid calling into uuid functions on startup. This is useful for Cloudflare Workers where random number generation is not available on startup (only during requests). Unless you are using Cloudflare Workers, you can ignore this change.

    The example below assumes you've provided a PRECOMPUTED_NONCE variable in your wrangler.toml file.

    Example usage:

    const server = new ApolloServer({
  // ...
  plugins: [
    ApolloServerPluginLandingPageLocalDefault({
      precomputedNonce: PRECOMPUTED_NONCE,
    }),
  ],
});

4.7.2

Patch Changes

  • #7599 c3f04d050 Thanks @trevor-scheer! - Update @apollo/utils.usagereporting dependency. Previously, installing @apollo/gateway and @apollo/server could result in duplicate / differently versioned installs of @apollo/usage-reporting-protobuf. This is because the @apollo/server-gateway-interface package was updated to use the latest protobuf, but the @apollo/utils.usagereporting package was not. After this change, users should always end up with a single install of the protobuf package when installing both @apollo/server and @apollo/gateway latest versions.

4.7.1

Patch Changes

  • #7539 5d3c45be9 Thanks @mayakoneval! - 馃悰 Bug Fix for Apollo Server Landing Pages on Safari. A Content Security Policy was added to our landing page html so that Safari can run the inline scripts we use to call the Embedded Sandbox & Explorer.

4.7.0

Minor Changes

  • #7504 22a5be934 Thanks @mayakoneval! - In the Apollo Server Landing Page Local config, you can now opt out of the telemetry that Apollo Studio runs in the embedded Sandbox & Explorer landing pages. This telemetry includes Google Analytics for event tracking and Sentry for error tracking.

    Example of the new config option:

    const server = new ApolloServer({
  typeDefs,
  resolvers,
  plugins: [
    process.env.NODE_ENV === 'production'
      ? ApolloServerPluginLandingPageProductionDefault({
          graphRef: 'my-graph-id@my-graph-variant',
          embed: {
            runTelemetry: false
          },
        })
      : ApolloServerPluginLandingPageLocalDefault({
          embed: {
            runTelemetry: false
          },
        }),
  ],
});

4.6.0

Minor Changes

  • #7465 1e808146a Thanks @trevor-scheer! - Introduce new opt-in configuration option to mitigate v4 status code regression

    Apollo Server v4 accidentally started responding to requests with an invalid variables object with a 200 status code, where v3 previously responded with a 400. In order to not break current behavior (potentially breaking users who have creatively worked around this issue) and offer a mitigation, we've added the following configuration option which we recommend for all users.

    new ApolloServer({
  // ...
  status400ForVariableCoercionErrors: true,
});

    Specifically, this regression affects cases where input variable coercion fails. Variables of an incorrect type (i.e. String instead of Int) or unexpectedly null are examples that fail variable coercion. Additionally, missing or incorrect fields on input objects as well as custom scalars that throw during validation will also fail variable coercion. For more specifics on variable coercion, see the "Input Coercion" sections in the GraphQL spec.

    This will become the default behavior in Apollo Server v5 and the configuration option will be ignored / no longer needed.

Patch Changes

  • #7454 f6e3ae021 Thanks @trevor-scheer! - Start building packages with TS 5.x, which should have no effect for users

  • #7433 e0db95b96 Thanks @KGAdamCook! - Previously, when users provided their own documentStore, Apollo Server used a random prefix per schema in order to guarantee there was no shared state from one schema to the next. Now Apollo Server uses a hash of the schema, which enables the provided document store to be shared if you choose to do so.

4.5.0

Minor Changes

  • #7431 7cc163ac8 Thanks @mayakoneval! - In the Apollo Server Landing Page Local config, you can now automatically turn off autopolling on your endpoints as well as pass headers used to introspect your schema, embed an operation from a collection, and configure whether the endpoint input box is editable. In the Apollo Server Landing Page Prod config, you can embed an operation from a collection & we fixed a bug introduced in release 4.4.0

    Example of all new config options:

    const server = new ApolloServer({
  typeDefs,
  resolvers,
  plugins: [
    process.env.NODE_ENV === 'production'
      ? ApolloServerPluginLandingPageProductionDefault({
          graphRef: 'my-graph-id@my-graph-variant',
          collectionId: 'abcdef',
          operationId: '12345'
          embed: true,
          footer: false,
        })
      : ApolloServerPluginLandingPageLocalDefault({
          collectionId: 'abcdef',
          operationId: '12345'
          embed: {
            initialState: {
              pollForSchemaUpdates: false,
              sharedHeaders: {
                "HeaderNeededForIntrospection": "ValueForIntrospection"
              },
            },
            endpointIsEditable: true,
          },
          footer: false,
        }),
  ],
});

  • #7430 b694bb1dd Thanks @mayakoneval! - We now send your @apollo/server version to the embedded Explorer & Sandbox used in the landing pages for analytics.

Patch Changes

  • #7432 8cbc61406 Thanks @mayakoneval! - Bug fix: TL;DR revert a previous change that stops passing includeCookies from the prod landing page config.

    Who was affected?

    Any Apollo Server instance that passes a graphRef to a production landing page with a non-default includeCookies value that does not match the Include cookies setting on your registered variant on studio.apollographql.com.

    How were they affected?

    From release 4.4.0 to this patch release, folks affected would have seen their Explorer requests being sent with cookies included only if they had set Include cookies on their variant. Cookies would not have been included by default.

4.4.1

Patch Changes

  • Updated dependencies [021460e95]:
    • @apollo/usage-reporting-protobuf@4.1.0

4.4.0

Minor Changes

4.3.3

Patch Changes

  • #7331 9de18b34c Thanks @trevor-scheer! - Unpin node-abort-controller and update to latest unbreaking patch

  • #7136 8c635d104 Thanks @trevor-scheer! - Errors reported by subgraphs (with no trace data in the response) are now accurately reflected in the numeric error stats.

    Operations that receive errors from subgraphs (with no trace data in the response) are no longer sent as incomplete, error-less traces.

    If you are upgrading to or beyond this version, you may notice a change in your error stats in Apollo Studio. Previously, configuring fieldLevelInstrumentation inadvertently affected the counting of error stats in the usage reporting plugin (whenever fieldLevelInstrumentation was set to or resolved to 0, errors would not be counted). With this change, errors are counted accurately regardless of the fieldLevelInstrumentation setting.

    Note: in order for this fix to take effect, your @apollo/gateway version must be updated to v2.3.1 or later.

4.3.2

Patch Changes

  • #7314 f246ddb71 Thanks @trevor-scheer! - Add an __identity property to HeaderMap class to disallow standard Maps (in TypeScript).

    This ensures that typechecking occurs on fields which are declared to accept a HeaderMap (notably, the httpGraphQLRequest.headers option to ApolloServer.executeHTTPGraphQLRequest and the http.headers option to ApolloServer.executeOperation). This might be a breaking change for integration authors, but should be easily fixed by switching from new Map<string, string>() to new HeaderMap().

  • #7326 e25cb58ff Thanks @trevor-scheer! - Pin node-abort-controller version to avoid breaking change. Apollo Server users can enter a broken state if they update their package-lock.json due to a breaking change in a minor release of the mentioned package.

    Ref: southpolesteve/node-abort-controller#39

  • Updated dependencies [e0f959a63]:

    • @apollo/server-gateway-interface@1.1.0

4.3.1

Patch Changes

  • #7313 ec28b4b33 Thanks @vtipparam! - Allow case insensitive lookup on headers. Use HeaderMap instead of plain Map for headers in expressMiddleware.

  • #7311 322b5ebbc Thanks @axe-me! - Export intermediate ApolloServerOptions* types

  • #7274 3b0ec8529 Thanks @patrick91! - The subgraph spec has evolved in Federation v2 such that the type of _Service.sdl (formerly nullable) is now non-nullable. Apollo Server now detects both cases correctly in order to determine whether to:

    1. install / enable the ApolloServerPluginInlineTrace plugin
    2. throw on startup if ApolloServerPluginSchemaReporting should not be installed
    3. warn when ApolloServerPluginUsageReporting is installed and configured with the __onlyIfSchemaIsNotSubgraph option

4.3.0

Minor Changes

  • #7241 d7e9b9759 Thanks @glasser! - If the cache you provide to the persistedQueries.cache option is created with PrefixingKeyValueCache.cacheDangerouslyDoesNotNeedPrefixesForIsolation (new in @apollo/utils.keyvaluecache@2.1.0), the apq: prefix will not be added to cache keys. Providing such a cache to new ApolloServer() throws an error.

Patch Changes

  • #7232 3a4823e0d Thanks @glasser! - Refactor the implementation of ApolloServerPluginDrainHttpServer's grace period. This is intended to be a no-op.

  • #7229 d057e2ffc Thanks @dnalborczyk! - Improve compatibility with Cloudflare workers by avoiding the use of the Node util package. This change is intended to be a no-op.

  • #7228 f97e55304 Thanks @dnalborczyk! - Improve compatibility with Cloudflare workers by avoiding the use of the Node url package. This change is intended to be a no-op.

  • #7241 d7e9b9759 Thanks @glasser! - For ease of upgrade from the recommended configuration of Apollo Server v3.9+, you can now pass new ApolloServer({ cache: 'bounded' }), which is equivalent to not providing the cache option (as a bounded cache is now the default in AS4).

4.2.2

Patch Changes

  • #7203 2042ee761 Thanks @glasser! - Fix v4.2.0 (#7171) regression where "operationName": null, "variables": null, and "extensions": null in POST bodies were improperly rejected.

4.2.1

Patch Changes

  • #7187 3fd7b5f26 Thanks @trevor-scheer! - Update @apollo/utils.keyvaluecache dependency to the latest patch which correctly specifies its version of lru-cache.

  • Updated dependencies [3fd7b5f26]:

    • @apollo/server-gateway-interface@1.0.7

4.2.0

Minor Changes

  • #7171 37b3b7fb5 Thanks @glasser! - If a POST body contains a non-string operationName or a non-object variables or extensions, fail with status code 400 instead of ignoring the field.

    In addition to being a reasonable idea, this provides more compliance with the "GraphQL over HTTP" spec.

    This is a backwards incompatible change, but we are still early in the Apollo Server 4 adoption cycle and this is in line with the change already made in Apollo Server 4 to reject requests providing variables or extensions as strings. If this causes major problems for users who have already upgraded to Apollo Server 4 in production, we can consider reverting or partially reverting this change.

  • #7184 b1548c1d6 Thanks @glasser! - Don't automatically install the usage reporting plugin in servers that appear to be hosting a federated subgraph (based on the existence of a field _Service.sdl: String). This is generally a misconfiguration. If an API key and graph ref are provided to the subgraph, log a warning and do not enable the usage reporting plugin. If the usage reporting plugin is explicitly installed in a subgraph, log a warning but keep it enabled.

Patch Changes

  • #7170 4ce738193 Thanks @trevor-scheer! - Update @apollo/utils packages to v2 (dropping node 12 support)

  • #7172 7ff96f533 Thanks @trevor-scheer! - startStandaloneServer: Restore body-parser request limit to 50mb (as it was in the apollo-server package in Apollo Server 3)

  • #7183 46af8255c Thanks @glasser! - Apollo Server tries to detect if execution errors are variable coercion errors in order to give them a code extension of BAD_USER_INPUT rather than INTERNAL_SERVER_ERROR. Previously this would unconditionally set the code; now, it only sets the code if no code is already set, so that (for example) custom scalar parseValue methods can throw errors with specific codes. (Note that a separate graphql-js bug can lead to these extensions being lost; see graphql/graphql-js#3785 for details.)

  • Updated dependencies [4ce738193, 45856e1dd]:

    • @apollo/server-gateway-interface@1.0.6

4.1.1

Patch Changes

  • #7118 c835637be Thanks @glasser! - Provide new GraphQLRequestContext.requestIsBatched field to gateways, because we did add it in a backport to AS3 and the gateway interface is based on AS3.

  • Updated dependencies [c835637be]:

    • @apollo/server-gateway-interface@1.0.5

4.1.0

Minor Changes

  • 2a2d1e3b4 Thanks @glasser! - The cache-control HTTP response header set by the cache control plugin now properly reflects the cache policy of all operations in a batched HTTP request. (If you write the cache-control response header via a different mechanism to a format that the plugin would not produce, the plugin no longer writes the header.) For more information, see advisory GHSA-8r69-3cvp-wxc3.

  • 2a2d1e3b4 Thanks @glasser! - Plugins processing multiple operations in a batched HTTP request now have a shared requestContext.request.http object. Changes to HTTP response headers and HTTP status code made by plugins operating on one operation can be immediately seen by plugins operating on other operations in the same HTTP request.

  • 2a2d1e3b4 Thanks @glasser! - New field GraphQLRequestContext.requestIsBatched available to plugins.

4.0.5

Patch Changes

  • #7104 15d8d65e0 Thanks @glasser! - New ApolloServerPluginSchemaReportingDisabled plugin which can override the APOLLO_SCHEMA_REPORTING environment variable.

  • #7101 e4e7738be Thanks @glasser! - Manage memory more efficiently in the usage reporting plugin by allowing large objects to be garbage collected more quickly.

  • #7101 e4e7738be Thanks @glasser! - The usage reporting plugin now defaults to a 30 second timeout for each attempt to send reports to Apollo Server instead of no timeout; the timeout can be adjusted with the new requestTimeoutMs option to ApolloServerPluginUsageReporting. (Apollo's servers already enforced a 30 second timeout, so this is unlikely to break any existing use cases.)

  • #7104 15d8d65e0 Thanks @glasser! - It is now an error to combine a "disabled" plugin such as ApolloServerPluginUsageReportingDisabled with its enabled counterpart such as ApolloServerPluginUsageReporting.

4.0.4

This version has no changes; @apollo/server and @apollo/server-integration-test are published with matching version numbers and we published a new version of @apollo/server-integration-test.

4.0.3

Patch Changes

  • #7073 e7f524eac Thanks @glasser! - Never interpret GET requests as batched. In previous versions of Apollo Server 4, a GET request whose body was a JSON array with N elements would be interpreted as a batch of the operation specified in the query string repeated N times. Now we just ignore the body for GET requests (like in Apollo Server 3), and never treat them as batched.

  • #7071 0ed389ce8 Thanks @glasser! - Fix v4 regression: gateway implementations should be able to set HTTP response headers and the status code.

4.0.2

Patch Changes

  • #7035 b3f400063 Thanks @barryhagan! - Errors resulting from an attempt to use introspection when it is not enabled now have an additional validationErrorCode: 'INTROSPECTION_DISABLED' extension; this value is part of a new enum ApolloServerValidationErrorCode exported from @apollo/server/errors.

4.0.1

Patch Changes

  • #7049 3daee02c6 Thanks @glasser! - Raise minimum engines requirement from Node.js v14.0.0 to v14.16.0. This is the minimum version of Node 14 supported by the engines requirement of graphql@16.6.0.

  • #7049 3daee02c6 Thanks @glasser! - Require Node.js v14 rather than v12. This change was intended for v4.0.0 and the documentation already stated this requirement, but was left off of the package.json engines field in @apollo/server inadvertently.

4.0.0

BREAKING CHANGES

Apollo Server contains quite a few breaking changes: most notably, a brand new package name! Read our migration guide for more details on how to update your app.

Bumped dependencies

The minimum versions of these dependencies have been bumped to provide an improved foundation for the development of future features.

  • Dropped support for Node.js v12, which is no longer under long-term support from the Node.js Foundation.
  • Dropped support for versions of the graphql library prior to v16.6.0.
    • Upgrading graphql may require you to upgrade other libraries that are installed in your project. For example, if you use Apollo Server with Apollo Gateway, you should upgrade Apollo Gateway to at least v0.50.1 or any v2.x version for full graphql 16 support before upgrading to Apollo Server 4.
  • If you use Apollo Server with TypeScript, you must use TypeScript v4.7.0 or newer.

New package structure

Apollo Server 4 is distributed in the @apollo/server package. This package replaces apollo-server, apollo-server-core, apollo-server-express, apollo-server-errors, apollo-server-types, and apollo-server-plugin-base.

The @apollo/server package exports the ApolloServer class. In Apollo Server 3, individual web framework integrations had their own subclasses of ApolloServer. In Apollo Server 4, there is a single ApolloServer class; web framework integrations define their own functions which use a new stable integration API on ApolloServer to execute operations.

Other functionality is exported from "deep imports" on @apollo/server. startStandaloneServer (the replacement for the batteries-included apollo-server package) is exported from @apollo/server/standalone. expressMiddleware (the replacement for apollo-server-express) is exported from @apollo/server/express4. Plugins such as ApolloServerPluginUsageReporting are exported from paths such as @apollo/server/plugin/usageReporting.

The @apollo/server package is built natively as both an ECMAScript Module (ESM) and as a CommonJS module (CJS); Apollo Server 3 was only built as CJS. This allows ESM-native bundlers to create more efficient bundles.

Other packages have been renamed:

Removed web framework integrations

Prior to Apollo Server 4, the only way to integrate a web framework with Apollo Server was for the Apollo Server project to add an official apollo-server-x subclass maintained as part of the core project. Apollo Server 4 makes it easy for users to integrate with their favorite web framework, and so we have removed most of the framework integrations from the core project so that framework integrations can be maintained by users who are passionate about that framework. Because of this, the core project no longer directly maintains integrations for Fastify, Hapi, Koa, Micro, AWS Lambda,Google Cloud Functions, Azure Functions, or Cloudflare. We expect that community integrations will eventually be created for most of these frameworks and serverless environments.

Apollo Server's support for the Express web framework no longer also supports its older predecessor Connect.

Removed constructor options

  • The dataSources constructor option essentially added a post-processing step to your app's context function, creating DataSource subclasses and adding them to a dataSources field on your context value. This meant the TypeScript type the context function returns was different from the context type your resolvers and plugins receive. Additionally, this design obfuscated that DataSource objects are created once per request (i.e., like the rest of the context object). Apollo Server 4 removes the dataSources constructor option. You can now treat DataSources like any other part of your context object. See the migration guide for details on how to move your dataSources function into your context function.
  • The modules constructor option was just a slightly different way of writing typeDefs and resolvers (although it surprisingly used entirely different logic under the hood). This option has been removed.
  • The mocks and mockEntireSchema constructor options wrapped an outdated version of the @graphql-tools/mocks library to provide mocking functionality. These constructor options have been removed; you can instead directly incorporate the @graphql-tools/mock package into your app, enabling you to get the most up-to-date mocking features.
  • The debug constructor option (which defaulted to true unless the NODE_ENV environment variable is either production or test) mostly controlled whether GraphQL errors responses included stack traces, but it also affected the default log level on the default logger. The debug constructor option has been removed and is replaced with includeStacktraceInErrorResponses, which does exactly what it says it does.
  • The formatResponse constructor option has been removed; its functionality can be replaced by the willSendResponse plugin hook.
  • The executor constructor option has been removed; the ability to replace graphql-js's execution functionality is still available via the gateway option.

Removed features

  • Apollo Server 4 no longer responds to health checks on the path /.well-known/apollo/server-health. You can run a trivial GraphQL operation as a health check, or you can add a custom health check via your web framework.
  • Apollo Server 4 no longer cares what URL path is used to access its functionality. Instead of specifying the path option to various Apollo Server methods, just use your web framework's routing feature to mount the Apollo Server integration at the appropriate path.
  • Apollo Server 4's Express middleware no longer wraps the body-parser and cors middleware; it is your responsibility to install and set up these middleware yourself when using a framework integration. (The standalone HTTP server sets up body parsing and CORS for you, but without the ability to configure their details.)
  • Apollo Server no longer re-exports the gql tag function from graphql-tag. If you want to use gql, install the graphql-tag package.
  • Apollo Server no longer defines its own ApolloError class and toApolloError function. Instead, use GraphQLError from the graphql package.
  • Apollo Server no longer exports error subclasses representing the errors that it creates, such as SyntaxError. Instead, it exports an enum ApolloServerErrorCode that you can use to recognize errors created by Apollo Server.
  • Apollo Server no longer exports the ForbiddenError and AuthenticationError classes. Instead, you can define your own error codes for these errors or other errors.
  • The undocumented __resolveObject pseudo-resolver is no longer supported.
  • The requestAgent option to ApolloServerPluginUsageReporting has been removed.
  • In the JSON body of a POST request, the variables and extensions fields must be objects, not JSON-encoded strings.
  • The core Apollo Server packages no longer provide a landing page plugin for the unmaintained GraphQL Playground UI. We have published an Apollo Server 4-compatible landing page plugin in the package @apollo/server-plugin-landing-page-graphql-playground, but do not intend to maintain it further after this one-time publish.

Modified functionality

  • The context function is now provided to your integration function (such as startStandaloneServer or expressMiddleware) rather than to the new ApolloServer constructor.
  • The executeOperation method now directly accepts a context value, rather than accepting the arguments to your context function.
  • The formatError hook now receives the original thrown error in addition to the formatted error.
  • Formatted errors no longer contain the extensions.exception field containing all enumerable properties of the originally thrown error. If you want to include more information in an error, specify them as extensions when creating a GraphQLError. The stacktrace field is provided directly on extensions rather than nested under exception.
  • All errors responses are consistently rendered as application/json JSON responses, and the formatError hook is used consistently.
  • Other changes to error handling outside of resolvers are described in the migration guide.
  • The parseOptions constructor option only affects the parsing of incoming operations, not the parsing of typeDefs.

Plugin API changes

  • The field GraphQLRequestContext.context has been renamed to contextValue.
  • The field GraphQLRequestContext.logger is now readonly.
  • The fields GraphQLRequestContext.schemaHash and GraphQLRequestContext.debug have been removed.
  • The type GraphQLServiceContext has been renamed to GraphQLServerContext, and the fields schemaHash, persistedQueries, and serverlessFramework have been removed; the latter has been semi-replaced by startedInBackground.
  • The http field on the GraphQLRequest object (available to plugins as requestContext.request and as an argument to server.executeOperation) is no longer based on the Fetch API's Request object. It no longer contains an URL path, and its headers field is a Map rather than a Headers object.
  • The structure of the GraphQLResponse object (available to plugins as requestContext.response and as the return value from server.executeOperation) has changed in several ways.
  • The plugins constructor argument does not take factory functions.
  • requestDidStart hooks are called in parallel rather than in series.
  • A few changes have been made which may affect custom gateway and GraphQLDataSource implementations.

Changes to defaults

  • CSRF prevention is on by default.
  • HTTP batching is disabled by default.
  • The default in-memory cache is bounded.
  • The local landing page defaults to the embedded Apollo Sandbox; this provides a user interface for executing GraphQL operations which doesn't require any additional CORS configuration.
  • The usage reporting and inline trace plugins mask errors in their reports by default: error messages are replaced with <masked> and error extensions are replaced with a single extension maskedBy. This can be configured with the sendErrors option to ApolloServerPluginUsageReporting and the includeErrors option to ApolloServerPluginInlineTrace. The rewriteError option to these plugins has been removed; its functionality is subsumed by the new options.

TypeScript-specific changes

  • The TypeScript types for the validationRules constructor option are more accurate.
  • We now use the @apollo/utils.fetcher package to define the shape of the Fetch API, instead of apollo-server-env. This package only supports argument structures that are likely to be compatible across implementations of the Fetch API.
  • The CacheScope, CacheHint, CacheAnnotation, CachePolicy, and ResolveInfoCacheControl types are now exported from the @apollo/cache-control-types package. CacheScope is now a pure TypeScript type rather than an enum.
  • The type for ApolloServer's constructor options argument is now ApolloServerOptions, not Config or ApolloServerExpressConfig.
  • Some other types have been renamed or removed; see the migration guide for details.

New features

  • In TypeScript, you can now declare your server's context value type using generic type syntax, like new ApolloServer<MyContextType>. This ensures that the type returned by your context function matches the context type provided to your resolvers and plugins.
  • ApolloServer now has a well-documented API for integrating with web frameworks, featuring the new executeHTTPGraphQLRequest method.
  • ApolloServer now has explicit support for the "serverless" style of startup error handling. Serverless frameworks generally do not allow handlers to do "async" work during startup, so any failure to load the schema or run serverWillStart handlers can't prevent requests from being served. Apollo Server 4 provides a server.startInBackgroundHandlingStartupErrorsByLoggingAndFailingAllRequests() method as an alternative to await server.start() for use in contexts like serverless environments.
  • You can add a plugin to a server with server.addPlugin(). Plugins can only be added before the server is started. This allows you to pass the server itself as an argument to the plugin.
  • ApolloServer has new public readonly cache and logger fields.
  • When combined with graphql v17 (only available as pre-releases as of September 2022), Apollo Server now has experimental support for incremental delivery directives such as @defer and @stream.
  • Apollo Server 4 adds new plugin hooks startupDidFail, contextCreationDidFail, invalidRequestWasReceived, unexpectedErrorProcessingRequest, didEncounterSubsequentErrors, and willSendSubsequentPayload.
  • If Apollo Server receives an operation while the server is shutting down, it now logs a warning telling you to properly configure HTTP server draining.
  • Apollo Server now supports responses with content-type: application/graphql-response+json when requested by clients via the accept header, as described in the GraphQL over HTTP specification proposal.

Versions prior to 4.0.0

The first version of Apollo Server published in the @apollo/server package is v4.0.0. Before this release, all Apollo Server packages tracked their changes in a single file, which can be found at CHANGELOG_historical.md.