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ReferenceError.referenceError

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

Syntax

new ReferenceError([message[, fileName[, lineNumber]]])

Parameters

message Optional
Human-readable description of the 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 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() 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() constructor 1 18 4 10.1 1 1.0
Server
Node.js
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/ReferenceError