Flow – static type checker

Flow is a static type checker for your JavaScript code. It does a lot of work to make you more productive. Making you code faster, smarter, more confidently, and to a bigger scale.

Flow checks your code for errors through static type annotations. These types allow you to tell Flow how you want your code to work, and Flow will make sure it does work that way.

This is free and open source software.

Website: github.com/facebook/flow
Support:
Developer: Meta Platforms, Inc. and affiliates
License: MIT License

Flow is written in OCaml and JavaScript. Learn OCaml with our recommended free books and free tutorials. Learn JavaScript with our recommended free books and free tutorials.


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Read our verdict in the software roundup.


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