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Bethemesh
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JSON to TypeScript Pro

Turn sample JSON into reliable TypeScript models, Zod schemas, or JSON Schema. The inference engine handles nested objects, arrays, unions, optional properties, and null values entirely in your browser.

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  • 100% local
  • Instant
  • Free
  • No account
  • Works offline
  • Clipboard

Why use this tool?

Convert sample JSON into clean, reusable TypeScript models. The tool inspects nested objects and arrays to detect unions, optional properties, and null values without sending your data to a server.

100% local and secure

Your data stays on your device and is never sent to our servers.

Smart processing

Generate, convert, or validate technical data with purpose-built controls.

Supported formats

Technical formats and syntaxes suited to each generator, converter, or validator.

Save time

Get a clean, ready-to-use result in seconds without installing software or configuring a complex workflow.

Fonctionnement

How does this tool work?

The tool first parses the JSON locally in your browser, then recursively inspects every object, array, and primitive value. It merges compatible structures, identifies properties that are missing from some array items, infers the required unions, and preserves nullable values. From this shared intermediate model, it generates consistent TypeScript interfaces, type aliases, a Zod schema, or JSON Schema without network requests or server-side processing.

Use cases

Type an API response

Create the TypeScript interfaces required by an API client from a real and representative response payload.

Add runtime validation

Generate a Zod schema to validate incoming data before your application stores, displays, or transforms it.

Document a data contract

Produce JSON Schema that clearly documents a shared data contract across teams, services, and environments.

Guide

How to use this tool

  1. 1

    Paste a representative sample

    Use an object or array that contains the different shapes your API may return.

  2. 2

    Choose your target

    Generate interfaces, type aliases, a Zod schema, or JSON Schema for your project.

  3. 3

    Integrate the result

    Review the inferred types, then copy or export the generated code.

Tips and best practices

  • Include several array items so optional properties can be detected accurately.
  • Use a domain-specific root name such as UserResponse or ProductCatalog.
  • Review generated unions whenever a field can contain several data shapes.

Frequently asked questions

Is my JSON uploaded to a server?

No. Parsing, type inference, and code generation run entirely inside your browser. Your JSON content is never transmitted to or stored on a remote server.

How are optional properties detected?

When an array contains multiple objects, a property missing from some items is marked optional so the generated model reflects every observed shape accurately.

Why generate a Zod schema?

TypeScript checks code at compile time, while Zod validates the real data received at runtime and can immediately report an invalid or unexpected structure.

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