title | slug | tags | browser-compat | |||||
---|---|---|---|---|---|---|---|---|
TypeError |
Web/JavaScript/Reference/Global_Objects/TypeError |
|
javascript.builtins.TypeError |
{{JSRef}}
The TypeError
object represents an error when an operation could not be performed, typically (but not exclusively) when a value is not of the expected type.
A TypeError
may be thrown when:
- an operand or argument passed to a function is incompatible with the type expected by that operator or function; or
- when attempting to modify a value that cannot be changed; or
- when attempting to use a value in an inappropriate way.
TypeError
is a {{Glossary("serializable object")}}, so it can be cloned with {{domxref("structuredClone()")}} or copied between Workers using {{domxref("Worker.postMessage()", "postMessage()")}}.
- {{jsxref("Global_Objects/TypeError/TypeError", "TypeError()")}}
- : Creates a new
TypeError
object.
- : Creates a new
- {{jsxref("Error.prototype.message", "TypeError.prototype.message")}}
- : Error message. Inherited from {{jsxref("Error")}}.
- {{jsxref("Error.prototype.name", "TypeError.prototype.name")}}
- : Error name. Inherited from {{jsxref("Error")}}.
- {{jsxref("Error.prototype.cause", "TypeError.prototype.cause")}}
- : Error cause. Inherited from {{jsxref("Error")}}.
- {{jsxref("Error.prototype.fileName", "TypeError.prototype.fileName")}} {{non-standard_inline}}
- : Path to file that raised this error. Inherited from {{jsxref("Error")}}.
- {{jsxref("Error.prototype.lineNumber", "TypeError.prototype.lineNumber")}} {{non-standard_inline}}
- : Line number in file that raised this error. Inherited from {{jsxref("Error")}}.
- {{jsxref("Error.prototype.columnNumber", "TypeError.prototype.columnNumber")}} {{non-standard_inline}}
- : Column number in line that raised this error. Inherited from {{jsxref("Error")}}.
- {{jsxref("Error.prototype.stack", "TypeError.prototype.stack")}} {{non-standard_inline}}
- : Stack trace. Inherited from {{jsxref("Error")}}.
try {
null.f()
} catch (e) {
console.log(e instanceof TypeError) // true
console.log(e.message) // "null has no properties"
console.log(e.name) // "TypeError"
console.log(e.fileName) // "Scratchpad/1"
console.log(e.lineNumber) // 2
console.log(e.columnNumber) // 2
console.log(e.stack) // "@Scratchpad/2:2:3\n"
}
try {
throw new TypeError('Hello', "someFile.js", 10)
} catch (e) {
console.log(e instanceof TypeError) // true
console.log(e.message) // "Hello"
console.log(e.name) // "TypeError"
console.log(e.fileName) // "someFile.js"
console.log(e.lineNumber) // 10
console.log(e.columnNumber) // 0
console.log(e.stack) // "@Scratchpad/2:2:9\n"
}
{{Specifications}}
{{Compat}}
- {{jsxref("Error")}}