TypeError

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.

Constructor

TypeError(): Creates a new TypeError object.

Instance properties

TypeError.prototype.message: Error message. Although ECMA-262 specifies that TypeError should provide its own message property, in SpiderMonkey, it inherits Error.prototype.message.
TypeError.prototype.name: Error name. Inherited from Error.
TypeError.prototype.fileName: Path to file that raised this error. Inherited from Error.
TypeError.prototype.lineNumber: Line number in file that raised this error. Inherited from Error.
TypeError.prototype.columnNumber: Column number in line that raised this error. Inherited from Error.
TypeError.prototype.stack: Stack trace. Inherited from Error.

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 (ECMAScript) # sec-native-error-types-used-in-this-standard-typeerror

Browser compatibility

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