How do I convert JSON to Flow?
Paste your JSON sample into the editor on this page. The Flow output updates live — copy it or download a .js file.
JSON to Flow
Generate Flow type definitions from JSON instantly. Convert API responses into typed Flow objects for JavaScript projects with fast browser-based processing.
Options
Input JSON
Paste or edit your JSON sample
Flow output
Facebook Flow type definitions
Ready
type Root = {
id: number,
name: string,
email: string,
active: boolean,
score: number,
tags: string[],
profile: {
age: number,
city: string,
},
};Why JSON to Flow?
Legacy Flow codebases still need accurate types from JSON API samples.
This page presets Flow output so you can paste API JSON and ship typed code faster.
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FAQ
Is JSON to Flow conversion free?
Yes. JSON to Flow conversion on WebioTools is free for normal usage and runs in your browser.
Is my JSON data sent to a server?
No. Code generation happens locally in your browser. Your JSON never leaves your device.
Can I use this for API responses?
Absolutely. Paste REST or GraphQL JSON responses to scaffold Flow definitions for your project.