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ReferenceError

The ReferenceError object represents an error when a non-existent variable is referenced.

Constructor

ReferenceError()
Creates a new ReferenceError object.

Instance properties

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

Examples

Catching a ReferenceError

try {
  let a = undefinedVariable
} catch (e) {
  console.log(e instanceof ReferenceError)  // true
  console.log(e.message)                    // "undefinedVariable is not defined"
  console.log(e.name)                       // "ReferenceError"
  console.log(e.fileName)                   // "Scratchpad/1"
  console.log(e.lineNumber)                 // 2
  console.log(e.columnNumber)               // 6
  console.log(e.stack)                      // "@Scratchpad/2:2:7\n"
}

Creating a ReferenceError

try {
  throw new ReferenceError('Hello', 'someFile.js', 10)
} catch (e) {
  console.log(e instanceof ReferenceError)  // true
  console.log(e.message)                    // "Hello"
  console.log(e.name)                       // "ReferenceError"
  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

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
ReferenceError 1 12 1 5.5 5 1
ReferenceError() constructor 1 12 1 5.5 5 1
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
ReferenceError 1 18 4 10.1 1 1.0
ReferenceError() constructor 1 18 4 10.1 1 1.0
Server
Node.js
ReferenceError 0.1.100
ReferenceError() constructor 0.1.100

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ReferenceError