JSON to TypeScript Interface & JSON Schema
Convert JSON objects into TypeScript interfaces, types, Zod schemas, and standard JSON Schema (Draft-07).
Raw JSON Input
Generated TypeScript Interfaces
// Waiting for JSON input...About this tool
How to use it
- Paste your raw JSON payload, API response, or configuration object into the editor.
- Select your desired output target: TypeScript Interfaces, Type Aliases, JSON Schema (Draft-07), or Zod Validation Schema.
- Customize the root interface name (e.g. UserProfile, OrderResponse, ConfigState).
- Toggle optional property markers (?) or readonly modifiers as needed.
- Click 'Copy Output' to paste the generated type declarations into your codebase.
Why it matters
Frontend and backend TypeScript developers spend hours manually typing out repetitive interface contracts from JSON API responses. Automating recursive type inference, PascalCase naming, and schema generation saves significant engineering time while eliminating human typing errors.
When to use it
Use this converter when integrating third-party REST or GraphQL APIs, setting up runtime schema validation with Zod, drafting OpenAPI schemas, or migrating JavaScript projects to strict TypeScript.
Good to know
Conversion runs entirely within your web browser using client-side JavaScript. No sensitive API tokens, user data, or JSON payloads are ever transmitted over the network or saved to external servers.
Common questions
Should I use TypeScript interface or type alias?
Both define object shapes in TypeScript. `interface` is traditionally preferred for public API models and object definitions because interfaces support declaration merging and extension (`extends`). `type` is preferred for unions, primitives, and complex computed types.
How does the tool handle nested JSON objects?
Nested objects are recursively extracted into their own clean, separate PascalCase interfaces (for example, an `address` property will automatically generate an `export interface Address { ... }` block).
What is JSON Schema Draft-07?
JSON Schema is an IETF standard for annotating and validating JSON documents. Draft-07 is the most widely supported version across backend frameworks (such as AJV, Python jsonschema, and OpenAPI 3.0 specs).
Can I generate Zod schemas for runtime validation?
Yes! Select 'Zod Validation Schema (z.object)' in the output dropdown to generate executable Zod validation code (`export const RootSchema = z.object({ ... })`) that enforces runtime safety.
Is my JSON payload kept private?
Yes, 100%. The conversion algorithm executes entirely on your device via client-side JavaScript. No data is sent to an external server or cloud service.