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JavaScript | MDN

 Generated on January 22 2026 11:25 AM

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JavaScript | MDN

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Description

JavaScript (JS) is a lightweight interpreted (or just-in-time compiled) programming language with first-class functions. While it is most well-known as the scripting language for Web pages, many non-browser environments also use it, such as Node.js, Apache CouchDB and Adobe Acrobat. JavaScript is a prototype-based, garbage-collected, dynamic language, supporting multiple paradigms such as imperative, functional, and object-oriented.

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Headings

H1 H2 H3 H4 H5 H6
1 5 3 0 0 0
  • [H1] JavaScript
  • [H2] In this article
  • [H2] Beginner's tutorials
  • [H2] JavaScript guides
  • [H2] Reference
  • [H2] Help improve MDN
  • [H3] Fundamental language guides
  • [H3] Intermediate
  • [H3] Advanced

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just-in-time compiled Internal Passing Juice
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AggregateError: No Promise in Promise.any was resolved Internal Passing Juice
Error: Permission denied to access property "x" Internal Passing Juice
InternalError: too much recursion Internal Passing Juice
RangeError: argument is not a valid code point Internal Passing Juice
RangeError: BigInt division by zero Internal Passing Juice
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RangeError: form must be one of 'NFC', 'NFD', 'NFKC', or 'NFKD' Internal Passing Juice
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RangeError: x can't be converted to BigInt because it isn't an integer Internal Passing Juice
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ReferenceError: must call super constructor before using 'this' in derived class constructor Internal Passing Juice
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SyntaxError: incomplete quantifier in regular expression Internal Passing Juice
SyntaxError: invalid assignment left-hand side Internal Passing Juice
SyntaxError: invalid BigInt syntax Internal Passing Juice
SyntaxError: invalid capture group name in regular expression Internal Passing Juice
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SyntaxError: invalid class set operation in regular expression Internal Passing Juice
SyntaxError: invalid decimal escape in regular expression Internal Passing Juice
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SyntaxError: new keyword cannot be used with an optional chain Internal Passing Juice
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SyntaxError: raw bracket is not allowed in regular expression with unicode flag Internal Passing Juice
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TypeError: calling a builtin X constructor without new is forbidden Internal Passing Juice
TypeError: can't access/set private field or method: object is not the right class Internal Passing Juice
TypeError: can't assign to property "x" on "y": not an object Internal Passing Juice
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TypeError: can't define property "x": "obj" is not extensible Internal Passing Juice
TypeError: can't delete non-configurable array element Internal Passing Juice
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TypeError: X.prototype.y called on incompatible type Internal Passing Juice
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typeerror expression invalid class function assignment object regular syntaxerror javascript

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javascript 44
typeerror 38
expression 22
class 19

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