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esprima (4.0.1)

Published 2026-02-24 13:56:21 +00:00 by atheaadmin

Installation

Setup this registry in your project .npmrc file:

registry=

To install the package using npm, run the following command:

npm install esprima@4.0.1

or add it to the package.json file:

"esprima": "4.0.1"

For more information on the npm registry, see the documentation.

About this package

Esprima (esprima.org, BSD license) is a high performance, standard-compliant ECMAScript parser written in ECMAScript (also popularly known as JavaScript). Esprima is created and maintained by Ariya Hidayat, with the help of many contributors.

Features

• Full support for ECMAScript 2017 (ECMA-262 8th Edition)
• Sensible syntax tree format as standardized by ESTree project
• Experimental support for JSX, a syntax extension for React
• Optional tracking of syntax node location (index-based and line-column)
• Heavily tested (~1500 unit tests with full code coverage)

API

Esprima can be used to perform lexical analysis (tokenization) or syntactic analysis (parsing) of a JavaScript program.

A simple example on Node.js REPL:

> var esprima = require('esprima');
> var program = 'const answer = 42';

> esprima.tokenize(program);
[ { type: 'Keyword', value: 'const' },
  { type: 'Identifier', value: 'answer' },
  { type: 'Punctuator', value: '=' },
  { type: 'Numeric', value: '42' } ]
  
> esprima.parseScript(program);
{ type: 'Program',
  body:
   [ { type: 'VariableDeclaration',
       declarations: [Object],
       kind: 'const' } ],
  sourceType: 'script' }

For more information, please read the complete documentation.

Dependencies

Development Dependencies

ID	Version
codecov.io	~0.1.6
escomplex-js	1.2.0
everything.js	~1.0.3
glob	~7.1.0
istanbul	~0.4.0
json-diff	~0.3.1
karma	~1.3.0
karma-chrome-launcher	~2.0.0
karma-detect-browsers	~2.2.3
karma-edge-launcher	~0.2.0
karma-firefox-launcher	~1.0.0
karma-ie-launcher	~1.0.0
karma-mocha	~1.3.0
karma-safari-launcher	~1.0.0
karma-safaritechpreview-launcher	~0.0.4
karma-sauce-launcher	~1.1.0
lodash	~3.10.1
mocha	~3.2.0
node-tick-processor	~0.0.2
regenerate	~1.3.2
temp	~0.8.3
tslint	~5.1.0
typescript	~2.3.2
typescript-formatter	~5.1.3
unicode-8.0.0	~0.7.0
webpack	~1.14.0

Keywords

ast ecmascript esprima javascript parser syntax

Details

npm

2026-02-24 13:56:21 +00:00

1

Ariya Hidayat

Project Site

BSD-2-Clause

latest

51 KiB

Assets (1)

esprima-4.0.1.tgz 51 KiB

Versions (2) View all

4.0.1 2026-02-24

1.2.2 2026-02-24