jscodeshift

It is a tool specifically for batch-modifying JavaScript and TypeScript code, allowing you to write a small rule to automatically run across the entire project without opening each file manually.

It solves the pain of manually editing hundreds of files being tiring and prone to errors, replacing the traditional practice of opening files one by one and significantly reducing human error.

Suitable for frontend development engineers, technical leads, or developers maintaining large legacy projects who frequently need to upgrade dependencies.

Used to upgrade old library API calls, unify team code styles, migrate variable naming conventions, or batch replace outdated functions.

It understands code structure rather than simple text replacement, preserves original formatting, and supports a dry-run to check results before saving, ensuring modification safety.

Requires some JavaScript scripting knowledge, no extra server deployment needed, runs directly in the local command line, with many ready-made templates available on GitHub.