JSON to TypeScript Converter
100% Local Browser ProcessingJSON Developer SuiteGenerated TypeScript Output
Paste raw JSON code on the left to generate strongly-typed TypeScript interfaces here.
How to Convert JSON to TypeScript Interfaces Online
Generate strongly-typed TypeScript definitions and interface AST nodes in seconds directly inside your browser memory with 100% privacy guarantee.
Paste or Upload JSON
Paste your raw API response or database JSON payload into the left code editor, upload a .json file, or click 'Try Sample JSON' for instant 1-click testing.
Configure TypeScript Settings
Set your custom Root Interface Name (e.g. RootObject, UserData), toggle 'interface' vs 'type', add 'export' modifiers, or enable 'readonly' properties.
Copy or Download .ts
Click 'Copy TypeScript' to copy generated code to your clipboard, or click 'Download .ts' to save the strongly-typed interface file to your project.
JSON Value → TypeScript Type Conversion Rules
Understand how primitive JSON values, arrays, and nested objects map directly into TypeScript types.
| JSON Input Data | TS Inferred Type | Extraction Style | Generated TS Code |
|---|---|---|---|
| String ("hello") | string | Primitive string type signature | name: string; |
| Number (42, 99.5) | number | Primitive number type signature | score: number; |
| Boolean (true / false) | boolean | Primitive boolean flag signature | active: boolean; |
| Array of Strings (["admin", "dev"]) | string[] | Typed primitive array signature | roles: string[]; |
| Nested Object ({ "ip": "127.0.0.1" }) | Sub-Interface (Meta) | Extracted reusable interface | meta: Meta; |
| Array of Objects ([{ "id": 1 }]) | Sub-Interface Array (UserItem[]) | Array of extracted interfaces | users: UserItem[]; |
Why Use Meema Tools JSON to TypeScript?
Built for maximum developer productivity, automatic sub-interface extraction, and 100% client-side security.
Instant Interface Generation
Parses complex JSON payloads and generates strongly-typed TypeScript definitions in milliseconds.
100% Local Privacy
Zero server uploads. Your JSON data payloads and API responses remain strictly on your local device.
Sub-Interface Extraction
Automatically extracts deeply nested JSON objects into clean, modular sub-interfaces.
Customizable Export & Readonly
Configure custom root names, export modifiers, and readonly property fields with 1 click.
Frequently Asked Questions
About JSON to TypeScript
Everything you need to know about JSON to TypeScript interface conversion, sub-interface extraction, and privacy.
100% Confidentiality
All JSON code is parsed into TypeScript interfaces locally on your computer. Zero code bytes touch any external server.
Paste your raw JSON code or upload a .json file into the input editor. Our engine instantly analyzes your JSON object structure and generates clean, strongly-typed TypeScript interfaces or type aliases.
Nested JSON objects are automatically extracted into separate, reusable sub-interfaces (e.g. UserMeta, Address, OrderDetails) linked cleanly to your root interface.
Yes! Type any custom root name (such as ApiResponse, UserData, or ProductList) and toggle between 'interface' and 'type' declarations, optional 'export' keywords, and 'readonly' fields.
Yes, 100% private and secure! All AST parsing and TypeScript interface generation execute entirely inside your browser's local JavaScript memory. Zero code bytes leave your device.
Arrays containing primitive values (strings, numbers, booleans) generate clean array types like string[] or number[]. Arrays containing objects infer sub-interfaces and generate typed arrays like UserItem[].
No! Meema Tools JSON to TypeScript Converter is 100% free with unlimited document processing, zero file caps, and no user registration required.
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