Flow To JavaScript Converter
Strip Flow type annotations and convert Flow code to plain JavaScript instantly in your browser.
Convert Flow to Plain JavaScript
Flow adds static type annotations to JavaScript, but many projects eventually migrate to plain JavaScript or TypeScript. Removing type syntax by hand is tedious and easy to get wrong. This Flow to JavaScript converter strips Flow annotations and outputs clean, runnable JavaScript instantly.
What this tool does
Paste Flow-annotated code and receive JavaScript with types, interfaces, and type imports removed. Enable
stripping without an @flow pragma when working with files that omit the header comment. Pretty
output mode removes type tokens entirely instead of leaving whitespace gaps.
Migration and cleanup workflows
After converting Flow to JavaScript, you may want to generate TypeScript types from JSON payloads using our JSON to TypeScript POJO Generator. For general JavaScript formatting, pair this with the TypeScript Formatter which also handles JavaScript syntax.
Frequently Asked Questions
Do I need an @flow comment in my code?
By default, the tool strips annotations even without an @flow pragma. Disable that
option if you only want to process files that explicitly declare Flow at the top.
What is pretty output mode?
Pretty mode removes type annotations cleanly so the resulting JavaScript reads naturally. Without it, types are replaced with spaces to preserve original character positions for source map compatibility.
Does this convert Flow to TypeScript?
No. This tool outputs plain JavaScript without type annotations. For TypeScript source,
use the
Flow to TypeScript Converter
or the
Flow to TypeScript Declaration Converter
for .d.ts output.
Is my code uploaded to a server?
No. The Flow parser and transformer run entirely in your browser. Your source code stays local during conversion.
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