index.md

title	slug	tags	browser-compat
TypeError	Web/JavaScript/Reference/Global_Objects/TypeError	Class JavaScript Object Reference 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()")}}.

Constructor

• {{jsxref("Global_Objects/TypeError/TypeError", "TypeError()")}}
  • : Creates a new TypeError object.

Instance properties

• {{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")}}.

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

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• {{jsxref("Error")}}