The WebAssembly.CompileError() constructor creates a new WebAssembly CompileError object, which indicates an error during WebAssembly decoding or validation.


new WebAssembly.CompileError(message, fileName, lineNumber)


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.


The CompileError constructor contains no unique properties of its own, however, it does inherit some properties through the prototype chain.

Specifies the function that created an instance's prototype.
Error message. Although ECMA-262 specifies that URIError should provide its own message property, in SpiderMonkey, it inherits Error.prototype.message.
Error name. Inherited from Error.
Path to file that raised this error. Inherited from Error.
Line number in file that raised this error. Inherited from Error.
Column number in line that raised this error. Inherited from Error.
Stack trace. Inherited from Error.


The CompileError constructor contains no methods of its own, however, it does inherit some methods through the prototype chain.

Returns code that could eval to the same error. Inherited from Error.
Returns a string representing the specified Error object.. Inherited from Error.


The following snippet creates a new CompileError instance, and logs its details to the console:

try {
  throw new WebAssembly.CompileError('Hello', 'someFile', 10);
} catch (e) {
  console.log(e instanceof CompileError); // true
  console.log(e.message);                 // "Hello"
  console.log(e.name);                    // "CompileError"
  console.log(e.fileName);                // "someFile"
  console.log(e.lineNumber);              // 10
  console.log(e.columnNumber);            // 0
  console.log(e.stack);                   // returns the location where the code was run


Specification Status Comment
WebAssembly JavaScript Interface
The definition of 'WebAssembly constructors' in that specification.
Working Draft Initial WebAssembly draft definition.
ECMAScript Latest Draft (ECMA-262)
The definition of 'NativeError' in that specification.
Draft Definition of standard NativeError types.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support5716522 No4411
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support5757 Yes1522 ?117.0

1. This feature is behind the Experimental JavaScript Features preference.

2. Disabled in the Firefox 52 Extended Support Release (ESR).

See also

Document Tags and Contributors

Contributors to this page: chrisdavidmills, fscholz, ukyo, lukewagner
Last updated by: chrisdavidmills,