Release/0.21.4 (axios#4025)

* fix json transform when data is pre-stringified (axios#4020)

* [Updating] incorrect JSON syntax in README.md

* [Releasing] v0.21.4

Co-authored-by: Guillaume FORTAINE <guillaume+github@fortaine.com>

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+### 0.21.4 (September 6, 2021)
+
+Fixes and Functionality:
+- Fixing JSON transform when data is stringified. Providing backward compatability and complying to the JSON RFC standard ([#4020](https://github.com/axios/axios/pull/4020))
+
+Huge thanks to everyone who contributed to this release via code (authors listed below) or via reviews and triaging on GitHub:
+
+- [Jay](mailto:jasonsaayman@gmail.com)
+- [Guillaume Fortaine](https://github.com/gfortaine)
+- [Yusuke Kawasaki](https://github.com/kawanet)
+- [Dmitriy Mozgovoy](https://github.com/DigitalBrainJS)
+
 ### 0.21.3 (September 4, 2021)
 
 Fixes and Functionality:

README.md

@@ -474,7 +474,7 @@ These are the available config options for making requests. Only the `url` is re
     silentJSONParsing: true, // default value for the current Axios version
 
     // try to parse the response string as JSON even if `responseType` is not 'json'
-    forcedJSONParsing: true;
+    forcedJSONParsing: true,
 
     // throw ETIMEDOUT error instead of generic ECONNABORTED on request timeouts
     clarifyTimeoutError: false,

bower.json

@@ -1,7 +1,7 @@
 {
   "name": "axios",
   "main": "./dist/axios.js",
-  "version": "0.21.3",
+  "version": "0.21.4",
   "homepage": "https://axios-http.com",
   "authors": [
     "Matt Zabriskie"

lib/defaults.js

@@ -26,6 +26,21 @@ function getDefaultAdapter() {
   return adapter;
 }
 
+function stringifySafely(rawValue, parser, encoder) {
+  if (utils.isString(rawValue)) {
+    try {
+      (parser || JSON.parse)(rawValue);
+      return utils.trim(rawValue);
+    } catch (e) {
+      if (e.name !== 'SyntaxError') {
+        throw e;
+      }
+    }
+  }
+
+  return (encoder || JSON.stringify)(rawValue);
+}
+
 var defaults = {
 
   transitional: {
@@ -58,7 +73,7 @@ var defaults = {
     }
     if (utils.isObject(data) || (headers && headers['Content-Type'] === 'application/json')) {
       setContentTypeIfUnset(headers, 'application/json');
-      return JSON.stringify(data);
+      return stringifySafely(data);
     }
     return data;
   }],

package.json

@@ -1,6 +1,6 @@
 {
   "name": "axios",
-  "version": "0.21.3",
+  "version": "0.21.4",
   "description": "Promise based HTTP client for the browser and node.js",
   "main": "index.js",
   "types": "index.d.ts",

test/specs/defaults.spec.js

@@ -20,6 +20,19 @@ describe('defaults', function () {
     expect(defaults.transformRequest[0]({foo: 'bar'})).toEqual('{"foo":"bar"}');
   });
 
+  it("should also transform request json when 'Content-Type' is 'application/json'", function () {
+    var headers = {
+      'Content-Type': 'application/json',
+    };
+    expect(defaults.transformRequest[0](JSON.stringify({ foo: 'bar' }), headers)).toEqual('{"foo":"bar"}');
+    expect(defaults.transformRequest[0]([42, 43], headers)).toEqual('[42,43]');
+    expect(defaults.transformRequest[0]('foo', headers)).toEqual('"foo"');
+    expect(defaults.transformRequest[0](42, headers)).toEqual('42');
+    expect(defaults.transformRequest[0](true, headers)).toEqual('true');
+    expect(defaults.transformRequest[0](false, headers)).toEqual('false');
+    expect(defaults.transformRequest[0](null, headers)).toEqual('null');
+  });  
+
   it('should do nothing to request string', function () {
     expect(defaults.transformRequest[0]('foo=bar')).toEqual('foo=bar');
   });