Recast is an abstract syntax tree (AST) to AST transform tool, primarily used for safely performing automated code modifications, also known as codemods. It simplifies modifying JavaScript syntax by providing a wrapper around Esprima/Acorn parsers and Escodegen code generators. Recast preserves original formatting and comments, making it ideal for complex transformations without impacting readability or introducing accidental errors. This ensures modified code remains consistent with the original style.