fkling/astexplorer

Health v2 · maintenance only

Adoption not part of the score

6542 stars · 773 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

A web-based tool for exploring the abstract syntax trees (ASTs) generated by dozens of parsers for JavaScript, CSS, HTML, GraphQL, YAML, and more. It also lets developers prototype AST transforms with tools like Babel, ESLint, and jscodeshift directly in the browser.

Use cases

• inspect the AST of a JavaScript snippet
• compare output of different parsers like babel, acorn, and typescript
• prototype a babel plugin transform
• write and test a jscodeshift codemod
• explore the AST of CSS or HTML code
• debug eslint rule development by viewing the parsed tree
• learn how code is represented as syntax trees

When to choose

• you are developing or debugging AST-based tools like babel plugins, eslint rules, or codemods
• you want to quickly inspect how a parser represents code without setting up a project
• you need to compare AST output across many parsers and languages in one place

When to avoid

• you need AST parsing as a library inside your own application - use the individual parsers directly
• you need offline or programmatic AST analysis at scale
• you need parsers for languages not listed among its supported set

Facets

application · maturity active

parser developer-tools editor web-scraping developer-tools parsers web-development programming-languages browser ast ast-explorer code-parsing babel jscodeshift codemirror online-tool web-server javascript nodejs

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