API to TypeScript Interface Generator

Developing against an API requires accurate types. Our tool takes raw JSON responses from your endpoints and generates complete TypeScript interface definitions automatically.

Generate Interfaces

When to use this solution:

Use this whenever you're integrating a new API or when the backend documentation is missing typed definitions.

Common Use Cases

Mapping REST API responses to UI stateDefining types for frontend-backend contractsRapidly prototyping with external data sourcesDocumenting legacy API payloads with TypeScript

1Step-by-Step Guide

Get API Result

Fetch a sample JSON response from your API (e.g., using Postman or browser network tab).

Paste into Tool

Paste the JSON object into the input editor. Ensure it is a valid JSON format.

Copy Interface

The tool will instantly generate the TypeScript code. Copy it directly into your types file.

Ready to get started?

Use our free tool to solve this problem in seconds. No installation required.

Generate Interfaces

Frequently Asked Questions

Does it support deep nesting?

Yes, the tool recursively parses objects and creates sub-interfaces for all nested levels.

Can I customize the root interface name?

The default is set to 'RootObject', but you can easily rename it after pasting into your code editor.