JSParser is an updgraded version, for Dart 2.4 and above, of ParseJS. ParseJS is a JavaScript parser for Dart. It is well-tested and is reasonably efficient. Original project : https://github.com/asgerf/parsejs.dart This project is intended to migrate it to dart 2.4 or above

Example Usage

import 'package:jsparser/jsparser.dart';
import 'dart:io';

void main() {
    new File('test.js').readAsString().then((String code) {
        Program ast = parsejs(code, filename: 'test.js');
        // Use the AST for something


The jsparser function takes the following optional arguments:

  • filename: An arbitrary string indicating where the source came from. For your convenience this will be available on Node.filename and on ParseError.filename.
  • firstLine: The line number to associate with the first line of code. Default is 1. Useful if code was extracted from an HTML file, and you prefer absolute line numbers.
  • handleNoise: If true, parser will try to ignore hash bangs and HTML comment tags surrounding the source code. Default is true.
  • annotate: If true, parser will initialize Node.parent, Scope.environment, and Name.scope, to simplify subsequent AST analysis. Default is true.
  • parseAsExpression: If true, the input will be parsed as an expression statement.

To run test cases

  1. Open terminal and cd to parsejs.dart/test/util directory
  2. Do npm install
  3. CD to parsejs.dart/test/ director and run ./runtest