ast-grep

MIT structural AST search and rewrite (sg)

Rust / Terminal · OSS/MIT · 16.3k

Reviewed 2026-09-12 · last push 2026-10-15 · repo checked 2026-10-19

What's Good

MIT. ast-grep/ast-grep (`sg`). Pattern-based structural search, lint (`scan`), and codemod rewrite across many languages via tree-sitter. Interactive rewrite, LSP, and Node API (`@ast-grep/napi`). Homepage ast-grep.github.io; source github.com/ast-grep/ast-grep.

The Catch

Vs Semgrep (SAST/SCA product with Free Edition caps) and ripgrep (text search): ast-grep is the *structural AST CLI/codemod*, not a hosted AppSec platform and not byte/regex grep. You author AST patterns; text-only hunts still belong to rg. Slug is `ast-grep` (binary often `sg`).

Verdict

MIT AST search/rewrite. Free forever; match syntax trees, not just strings.

Embed

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