jscodeshift vs jSparrow

jscodeshift is a free toolkit for developers who build and run codemods across JavaScript, TypeScript, or Flow projects. A codemod parses source into an abstract syntax tree, changes that tree, and generates source code. The runner applies a transform to each file and reports files that were not transformed. Its command line accepts a local transform, a URL, or paths from standard input. Parser choices include Babel, Babylon, Flow, TypeScript, and TSX, with Babel as the default. Users can set child-process limits, choose extensions, exclude paths with ignore patterns or configuration files, and preview changes in dry-run mode. The API supports traversal, filtering, finding, replacing, inserting, removing, and renaming syntax-tree nodes, with optional formatting during output. jscodeshift wraps recast to help preserve source style. Jest and Jasmine utilities support fixture or inline tests, and VS Code debugging guidance is documented. It runs on Linux, macOS, Windows, or self-hosted environments under an MIT license.

jSparrow is a Java cleanup and refactoring tool for Eclipse IDE and Maven, running on Linux, macOS and Windows. It lists more than 90 refactorings for Java 1.1 and later, with project-level and batch operation. Diff View compares original and proposed code so changes can be reviewed before application. Markers suggest quick fixes during programming, and the base product includes them at no charge. Interactive rules can replace standard output with logging, rename fields to Java naming conventions and remove unused methods, fields and types. Analysis and refactoring run offline, and the FAQ says code is not sent to external servers or third parties. Internet access is required to persist locked refactorings through the NetLicensing API; offline validation servers are available. The site describes jSparrow as open-source, with no license needed since version 4.20.0. Twenty rules are free; paid licenses are $169 a month or $1,325 a year.