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Esprima (esprima.org, BSD license) is a high performance,standard-compliantECMAScriptparser written in ECMAScript (also popularly known asJavaScript).Esprima is created and maintained byAriya Hidayat,with the help ofmany contributors.

• Full support for ECMAScript 2019 (ECMA-262 10th Edition)
• Sensiblesyntax tree format as standardized byESTree project
• Experimental support forJSX, a syntax extension forReact
• Optional tracking of syntax node location (index-based and line-column)
• Heavily tested (~1600unit tests withfull code coverage)

Esprima can be used to performlexical analysis (tokenization) orsyntactic analysis (parsing) of a JavaScript program.

A simple example on Node.js REPL:

>varesprima=require('esprima');>varprogram='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 thecomplete documentation.