JSON to TypeScript client-side ?
How to use JSON to TypeScriptGenerate TypeScript interfaces from any JSON, directly in your browser. The tool analyzes the structure of your object and infers the types: strings, numbers, booleans, arrays and nested objects. You get interfaces ready to paste into your project, which saves you valuable time.
This is especially useful for quickly typing an API response: paste a sample payload and immediately get the matching type definitions. You gain TypeScript autocompletion and type checking without any manual effort.
Everything happens locally. Your JSON, which may contain real API data, is never sent to a server and stays completely private.
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Generate TypeScript interfaces from any JSON, directly in your browser. The tool analyzes the structure of your object and infers the types: strings, numbers, booleans, arrays and nested objects. You get interfaces ready to paste into your project, which saves you valuable time. This is especially useful for quickly typing an API response: paste a sample payload and immediately get the matching type definitions. You gain TypeScript autocompletion and type checking without any manual effort. Everything happens locally. Your JSON, which may contain real API data, is never sent to a server and stays completely private.
Generate TypeScript interfaces from JSON.
How to use JSON to TypeScript
Generate TypeScript interfaces from any JSON, directly in your browser. The tool analyzes the structure of your object and infers the types: strings, numbers, booleans, arrays and nested objects. You get interfaces ready to paste into your project, which saves you valuable time. This is especially useful for quickly typing an API response: paste a sample payload and immediately get the matching type definitions. You gain TypeScript autocompletion and type checking without any manual effort. Everything happens locally. Your JSON, which may contain real API data, is never sent to a server and stays completely private.
Frequently asked questions
Are nested objects typed ?
Yes. The tool creates separate interfaces for nested objects so your code stays readable and strongly typed.
How are null values handled ?
A null value produces a type often represented as nullable. Providing a complete example improves the accuracy of the generated types.
Is my JSON sent online ?
No. The type generation runs entirely in your browser, so your data stays private.
Are arrays typed correctly ?
Yes. The tool inspects array elements to infer their type, for example string[] or an array of typed objects.