1[![NPM version](https://img.shields.io/npm/v/esprima.svg)](https://www.npmjs.com/package/esprima) 2[![npm download](https://img.shields.io/npm/dm/esprima.svg)](https://www.npmjs.com/package/esprima) 3[![Build Status](https://img.shields.io/travis/jquery/esprima/master.svg)](https://travis-ci.org/jquery/esprima) 4[![Coverage Status](https://img.shields.io/codecov/c/github/jquery/esprima/master.svg)](https://codecov.io/github/jquery/esprima) 5 6**Esprima** ([esprima.org](http://esprima.org), BSD license) is a high performance, 7standard-compliant [ECMAScript](http://www.ecma-international.org/publications/standards/Ecma-262.htm) 8parser written in ECMAScript (also popularly known as 9[JavaScript](https://en.wikipedia.org/wiki/JavaScript)). 10Esprima is created and maintained by [Ariya Hidayat](https://twitter.com/ariyahidayat), 11with the help of [many contributors](https://github.com/jquery/esprima/contributors). 12 13### Features 14 15- Full support for ECMAScript 2016 ([ECMA-262 7th Edition](http://www.ecma-international.org/publications/standards/Ecma-262.htm)) 16- Sensible [syntax tree format](https://github.com/estree/estree/blob/master/es5.md) as standardized by [ESTree project](https://github.com/estree/estree) 17- Experimental support for [JSX](https://facebook.github.io/jsx/), a syntax extension for [React](https://facebook.github.io/react/) 18- Optional tracking of syntax node location (index-based and line-column) 19- [Heavily tested](http://esprima.org/test/ci.html) (~1300 [unit tests](https://github.com/jquery/esprima/tree/master/test/fixtures) with [full code coverage](https://codecov.io/github/jquery/esprima)) 20 21### API 22 23Esprima can be used to perform [lexical analysis](https://en.wikipedia.org/wiki/Lexical_analysis) (tokenization) or [syntactic analysis](https://en.wikipedia.org/wiki/Parsing) (parsing) of a JavaScript program. 24 25A simple example on Node.js REPL: 26 27```javascript 28> var esprima = require('esprima'); 29> var program = 'const answer = 42'; 30 31> esprima.tokenize(program); 32[ { type: 'Keyword', value: 'const' }, 33 { type: 'Identifier', value: 'answer' }, 34 { type: 'Punctuator', value: '=' }, 35 { type: 'Numeric', value: '42' } ] 36 37> esprima.parse(program); 38{ type: 'Program', 39 body: 40 [ { type: 'VariableDeclaration', 41 declarations: [Object], 42 kind: 'const' } ], 43 sourceType: 'script' } 44``` 45