TypeError() constructor

The TypeError() constructor creates a new error when an operation could not be performed, typically (but not exclusively) when a value is not of the expected type.

Syntax

new TypeError()
new TypeError(message)
new TypeError(message, options)
new TypeError(message, fileName)
new TypeError(message, fileName, lineNumber)

TypeError()
TypeError(message)
TypeError(message, options)
TypeError(message, fileName)
TypeError(message, fileName, lineNumber)

Note: TypeError() can be called with or without new. Both create a new TypeError instance.

Parameters

message Optional

Human-readable description of the error

options Optional

An object that has the following properties:

cause Optional

A property indicating the specific cause of the error. When catching and re-throwing an error with a more-specific or useful error message, this property can be used to pass the original error.

fileName Optional

The name of the file containing the code that caused the exception

lineNumber Optional

The line number of the code that caused the exception

Examples

Catching a TypeError

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"
}

Creating a TypeError

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

Specification
ECMAScript Language Specification
# sec-nativeerror-constructors

Browser compatibility

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See also