benjamn/recast

Health v2 · maintenance only

Adoption not part of the score

5255 stars · 363 forks observed · 2026-08-28

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

Recast is a JavaScript syntax tree (AST) transformer and nondestructive pretty-printer that preserves original formatting where possible. It also generates source maps automatically when reprinting modified syntax trees.

Use cases

• write codemods that refactor JavaScript code automatically
• transform a JavaScript AST and reprint it without losing formatting
• generate source maps for code transformations
• parse and manipulate JavaScript source code programmatically
• build custom linters or code analysis tools
• migrate legacy JavaScript syntax to newer standards

When to choose

• you need to modify JavaScript code while preserving original formatting and comments
• you are building codemods or automated refactoring tools
• you need automatic source map generation for transformed code
• you want a stable, widely-used AST manipulation library

When to avoid

• you only need to parse JavaScript without reprinting it
• you are transforming non-JavaScript languages
• you need a full-featured bundler or transpiler rather than an AST transformer

Facets

library · maturity stable

parser serialization developer-tools parsers developer-tools programming-languages ast source-maps codemod pretty-printer javascript nodejs

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