JSON to TypeScript
The JSON to TypeScript Converter helps you generate TypeScript interfaces and type definitions from JSON objects. Turn sample API responses and structured data into useful starting points for frontend applications, Node.js projects, and TypeScript development. Reduce repetitive manual typing and make it easier to model the shape of your data. Use this free online JSON to TypeScript tool to generate definitions from your JSON input.
Use your own data or load a sample to see how this tool works.
What is JSON to TypeScript?
A JSON to TypeScript Converter generates TypeScript interfaces and type definitions from sample JSON data. Turn API responses and structured objects into useful starting points for defining data models in frontend applications, Node.js projects, and TypeScript codebases. This free online JSON to TypeScript tool reduces repetitive manual typing and helps you describe the expected shape of your data.
Why use this tool?
- Inspect or reshape structured data without writing a script.
- Find syntax and conversion problems before the data reaches your application.
- Work with API responses, configuration files and exported data in one place.
How to use JSON to TypeScript
- Step 1. Paste your data or load a file into the input area.
- Step 2. Run the tool and read the result or any error message.
- Step 3. Copy or download the output and check it against what your application expects.
Common use cases
Represent JSON data with a TypeScript type
Use a type or interface to describe the expected shape of parsed JSON in your application.
type User = {
id: number;
name: string;
active: boolean;
};
const user: User = { id: 1, name: "Ada", active: true };Important notes
- Output depends on the input being valid, so fix syntax errors first.
- Check sensitive data handling before pasting private data into any online tool.
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JSON to TypeScript FAQ
What is JSON to TypeScript?
Convert JSON to TypeScript interfaces and types online. Generate type definitions from JSON objects for APIs, frontend apps, and Node.js projects.
Do I need an account to use JSON to TypeScript?
No. You can use it without creating an account.