Free JSON to TypeScript Tool
Convert JSON objects to TypeScript interfaces automatically. Free, fast, and works entirely in your browser with no sign-up required.
JSON to TypeScript
Convert JSON objects to TypeScript interfaces, type aliases, Zod schemas, or JSON Schema with smart type inference, tuple detection, and history.
Quick Presets
Options
JSON Input
About JSON to TypeScript
Output Formats
- TypeScript interfaces
- TypeScript type aliases
- Zod validation schemas
- JSON Schema (draft-07)
Type Detection
- Nested objects as separate types
- Mixed arrays and tuple detection
- Null vs undefined handling
- Enum generation from strings
- Auto-detect optional keys from samples
Features
- Multiple samples for better inference
- Readonly and optional modifiers
- Namespace wrapping
- Download as .ts or .d.ts
- Syntax-highlighted output
- Quick presets for common use cases
- Ctrl+Enter keyboard shortcut
Privacy First: All processing happens locally in your browser. Your JSON data is never sent to any server.
Related Tools
Frequently Asked Questions
What is the JSON to TypeScript converter?
The JSON to TypeScript converter is a free online tool that automatically generates TypeScript interfaces from JSON objects, saving you time writing type definitions.
Is the JSON to TypeScript converter free?
Yes, it is completely free with no registration required. All conversion happens client-side in your browser.
Does it handle nested objects?
Yes, the JSON to TypeScript converter handles deeply nested objects and arrays, generating proper TypeScript interfaces for each level.
Is my data safe with this tool?
Absolutely. The JSON to TypeScript Tool processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.
Does the JSON to TypeScript Tool work on mobile devices?
Yes, the JSON to TypeScript Tool is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.
Do I need to create an account to use this tool?
No account or registration is needed. Simply open the JSON to TypeScript Tool in your browser and start using it immediately. There are no sign-up walls or usage restrictions.
How do I use the JSON to TypeScript Tool?
Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.
Which browsers are supported?
The JSON to TypeScript Tool works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.
Related Tools
Free CSS Minifier Online
Minify CSS code to reduce file size and improve loading speed. Free, fast, and works entirely in your browser with no sign-up required.
Free JavaScript Minifier
Minify JavaScript code to reduce file size and improve performance. Free, fast, and works entirely in your browser with no sign-up required.
Free HTML Minifier Online
Minify HTML code to reduce page size and loading time. Free, fast, and works entirely in your browser with no sign-up required.
Free SQL Formatter & Beautifier
Format and beautify SQL queries for better readability. Free, fast, and works entirely in your browser with no sign-up required.
About Free JSON to TypeScript Tool
Free JSON to TypeScript Tool is a free, browser-based tool in our Code Tools collection. Everything runs locally on your device — no uploads, no sign-up, and your data stays private.