SyntaxError

Baseline Widely available *

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨July 2015⁩.

* Some parts of this feature may have varying levels of support.

TheSyntaxError object represents an error when trying to interpret syntactically invalid code. It is thrown when the JavaScript engine encounters tokens or token order that does not conform to the syntax of the language when parsing code.

SyntaxError is aserializable object, so it can be cloned withstructuredClone() or copied betweenWorkers usingpostMessage().

SyntaxError is a subclass ofError.

Constructor

SyntaxError(): Creates a newSyntaxError object.

Instance properties

Also inherits instance properties from its parentError.

These properties are defined onSyntaxError.prototype and shared by allSyntaxError instances.

SyntaxError.prototype.constructor: The constructor function that created the instance object. ForSyntaxError instances, the initial value is theSyntaxError constructor.
SyntaxError.prototype.name: Represents the name for the type of error. ForSyntaxError.prototype.name, the initial value is"SyntaxError".

Instance methods

Inherits instance methods from its parentError.

Examples

Catching a SyntaxError

try {  eval("hoo bar");} catch (e) {  console.log(e instanceof SyntaxError); // true  console.log(e.message);  console.log(e.name); // "SyntaxError"  console.log(e.stack); // Stack of the error}

Creating a SyntaxError

try {  throw new SyntaxError("Hello");} catch (e) {  console.log(e instanceof SyntaxError); // true  console.log(e.message); // "Hello"  console.log(e.name); // "SyntaxError"  console.log(e.stack); // Stack of the error}