Type definitions
JSON structure is converted to TypeScript interfaces or types.
Offline engine (processed locally)TYPESCRIPT v1.0.0 Spec
JSON to TypeScript
v1.0.0Convert your sample JSON into precise TypeScript interfaces and type aliases. This free tool handles optional properties, arrays, unions, and nested objects, perfect for adding type safety to your frontend or Node.js apps. No sign-up, works entirely in your browser.
—ms
JSONInput (JSON)Invalid
lines: 5chars: 115Size: 115 BUTF-8
TYPESCRIPTOutput (TYPESCRIPT)
Auto-generated
Converted output will appear herelines: 0chars: 0Size: 0 BUTF-8
Size change: -100.00%TOML compliant: v1.0.0Tool guide
Private processing
Your sample data stays in your browser.
Quick integration
The generated code is ready to copy into your project.
Read the result in your project
export interface ServerConfig {\n host: string;\n port: number;\n}\n\nexport interface AppConfig {\n server: ServerConfig;\n}