Free online JSON to TypeScript & Schema converter
Convert raw JSON objects, API responses, and database payloads into strictly typed TypeScript interfaces, type aliases, Zod validation schemas, or JSON Schema Draft-07 specifications. Accelerate your full-stack development without pasting confidential API responses or credentials onto external cloud servers.
How to generate TypeScript from JSON
- Paste your JSON payload into the input editor or click Sample to load a realistic API response.
- Select your target output format: TS Interface, TS Type, Zod Schema, or JSON Schema.
- Customize your root type identifier name and optionally enable readonly property modifiers.
- Copy the generated type declarations directly to your clipboard or download as a .ts file.
Why use client-side type generation
Engineering teams frequently work with proprietary user records, financial payloads, and confidential API contracts. Third-party type generators often log payloads to server disks. ToolCrix computes all AST transformations and type resolutions directly in your browser's local JavaScript engine, safeguarding your intellectual property.
Key features & benefits
- Multi-target code generation: generate TypeScript Interfaces, Type aliases, Zod runtime validators, and JSON Schema.
- Deep nested inference: recursively infers complex nested objects, arrays, and primitive unions.
- Customizable options: set custom root naming and readonly field modifiers.
- Zero server uploads: your proprietary data structures never leave your local environment.