JSON to TypeScript Converter

JSON Input0 chars
TypeScript Output0 chars
TypeScript interfaces will appear here...

Features:
- Nested object support
- Array type inference
- Union types for mixed data
- Optional properties
- Readonly modifier
- Export keyword toggle

Features

✓Smart type inference for primitives
✓Nested object extraction
✓Array type detection with union types
✓Null handling and optional properties
✓Special character key escaping
✓PascalCase naming for nested types

What This Tool Does

JSON to TypeScript Converter is built for deterministic developer and agent workflows.

Convert JSON to TypeScript interfaces and types with smart type inference, nested object support, array detection, and union types for mixed data.

Use How to Use for execution steps and FAQ for constraints, policies, and edge cases.

Last updated:

This tool is provided as-is for convenience. Output should be verified before use in any production or critical context.

Agent Invocation

Best Path For Builders

Dedicated API endpoint

Deterministic outputs, machine-safe contracts, and production-ready examples.

Dedicated API

https://aidevhub.io/api/json-to-typescript/

OpenAPI: https://aidevhub.io/api/openapi.yaml

GET /api/json-to-typescript/ GET json-to-typescript
POST /api/json-to-typescript/ POST json-to-typescript

Unified Runtime API

https://aidevhub.io/api/tools/run/?toolId=json-to-typescript&a=...

GET and POST are supported at /api/tools/run/ with identical validation and limits.

Limit: req / s, input max 128 KB.

How to Use JSON to TypeScript Converter

  1. 1

    Paste valid JSON

    Input a JSON object or array. The tool automatically infers TypeScript types from the structure: strings become `string`, numbers become `number`, objects become interfaces, arrays with consistent types become `Type[]`.

  2. 2

    Configure generation options

    Choose whether to use interface or type, decide on `readonly` properties, and pick naming conventions. For strict mode, enable additional validation flags in TypeScript's compiler settings.

  3. 3

    Handle nested structures

    Complex JSON with nested objects generates nested TypeScript interfaces. Each nested object gets its own interface, making the types reusable and easier to refactor.

  4. 4

    Copy and integrate

    Copy the generated TypeScript definitions into your project. Add them to a types file or at the top of your service file. Use the generated types for API responses, function parameters, and state management.

Frequently Asked Questions

What is JSON to TypeScript Converter?
JSON to TypeScript Converter generates TypeScript interfaces and types from JSON data. It uses smart type inference to handle nested objects, arrays, optional fields, and union types.
How do I use JSON to TypeScript Converter?
Paste your JSON data into the editor. The tool analyzes the structure and generates matching TypeScript interfaces with proper types for all fields, including nested objects and arrays. Copy the output into your project.
Is JSON to TypeScript Converter free?
Yes. This tool is free to use with immediate access—no account required.
Does JSON to TypeScript Converter store or send my data?
No. All processing happens entirely in your browser. Your JSON data never leaves your device — nothing is sent to any server.
Does JSON to TypeScript Converter handle nested objects?
Yes. It creates separate named interfaces for nested objects and properly types arrays, including arrays of objects. It also detects union types when array elements have different structures.