JSON to Flow Converter

How to use

1. Paste a representative JSON payload that matches the response or config shape your Flow-checked code actually consumes.
2. Review the generated `export type` aliases for nested objects, arrays, and optional properties inferred from the sample.
3. Copy the aliases into your typed JavaScript module and refine any exactness, utility wrappers, or shared naming conventions your Flow setup expects.

Benefits

• Keeps Flow-based projects typed without forcing a TypeScript migration just to scaffold payload contracts.
• Produces readable alias output that fits React, React Native, and service modules already checked by Flow.
• Reduces manual nested type authoring for larger API responses and configuration payloads.

Best use cases

• Legacy React and React Native apps that still use Flow for static checks.
• Typed JavaScript service modules that need reusable response aliases from real JSON samples.
• Teams maintaining Flow during a gradual migration where full TypeScript adoption is not immediate.

Flow tips

• Use realistic payloads so optional properties and nested shapes are inferred in a way that matches production responses.
• Keep generated aliases near the API client or shared contract modules that actually consume the payload.
• Switch to the TypeScript routes when downstream tooling or shared packages expect TS-native types instead of Flow aliases.

Implementation tips

• Choose this route when your current toolchain already uses Flow for static checks.
• Review optional properties against real payload variability before treating generated aliases as stable contracts.
• Switch to TypeScript routes instead when downstream consumers expect TS-native tooling, declaration emit, or schema inference.

Sample JSON

{
  "id": 101,
  "name": "Ada Lovelace",
  "active": true,
  "roles": ["admin", "editor"],
  "profile": {
    "email": "ada@example.com",
    "score": 9.8
  }
}

Sample output

export type UserModel = {
  id: number,
  name: string,
  active: boolean,
  roles: Array<string>,
  profile: Profile,
};

export type Profile = {
  email: string,
  score: number,
};

FAQ