SyntaxError
The SyntaxError
object represents an error when trying to interpret syntactically invalid code.
Description
A SyntaxError
is thrown when the JavaScript engine encounters tokens or token order that does not conform to the syntax of the language when parsing code.
Syntax
JavaScript
Copy Code
new SyntaxError([<var>message</var>[, <var>fileName</var>[, <var>lineNumber</var>]]])
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
Properties
SyntaxError.prototype
- Allows the addition of properties to a
SyntaxError
object.
Methods
The global SyntaxError
contains no methods of its own, however, it does inherit some methods through the prototype chain.
SyntaxError
instances
Properties
SyntaxError.prototype.constructor
- Specifies the function that created an instance's prototype.
SyntaxError.prototype.message
- Error message. Although ECMA-262 specifies that
SyntaxError
should provide its ownmessage
property, in SpiderMonkey, it inheritsError.prototype.message
. SyntaxError.prototype.name
- Error name. Inherited from
Error
. SyntaxError.prototype.fileName
- Path to file that raised this error. Inherited from
Error
. SyntaxError.prototype.lineNumber
- Line number in file that raised this error. Inherited from
Error
. SyntaxError.prototype.columnNumber
- Column number in line that raised this error. Inherited from
Error
. SyntaxError.prototype.stack
- Stack trace. Inherited from
Error
.
Methods
Although the SyntaxError
prototype object does not contain any methods of its own, SyntaxError
instances do inherit some methods through the prototype chain.
Examples
Catching a SyntaxError
JavaScript
Copy Code
try { eval('hoo bar'); } catch (e) { console.log(e instanceof SyntaxError); // true console.log(e.message); // "missing ; before statement" console.log(e.name); // "SyntaxError" console.log(e.fileName); // "Scratchpad/1" console.log(e.lineNumber); // 1 console.log(e.columnNumber); // 4 console.log(e.stack); // "@Scratchpad/1:2:3\n" }
Creating a SyntaxError
JavaScript
Copy Code
try { throw new SyntaxError('Hello', 'someFile.js', 10); } catch (e) { console.log(e instanceof SyntaxError); // true console.log(e.message); // "Hello" console.log(e.name); // "SyntaxError" console.log(e.fileName); // "someFile.js" console.log(e.lineNumber); // 10 console.log(e.columnNumber); // 0 console.log(e.stack); // "@Scratchpad/2:11:9\n" }
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript 3rd Edition (ECMA-262) | Standard | Initial definition. |
ECMAScript 5.1 (ECMA-262) The definition of 'SyntaxError' in that specification. |
Standard | |
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'SyntaxError' in that specification. |
Standard | |
ECMAScript 2017 Draft (ECMA-262) The definition of 'SyntaxError' in that specification. |
Draft |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
See also
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/javascript/reference/global_objects/syntaxerror