JSON to TypeScript
12 toolsGenerate a TypeScript interface from JSON.
Everything you'd need a dedicated JSON app for — formatting, a collapsible tree view, structural diffing, converting to/from CSV, YAML, and XML, generating TypeScript interfaces and JSON Schemas, querying with JSONPath, and validating JSON Lines — runs entirely client-side using your browser's native JSON engine, so nothing you paste is ever sent to a server.
How to use this tool
- 1Paste a sample JSON payload — e.g. an API response.
- 2A matching TypeScript interface is generated automatically, with nested objects as separate interfaces.
- 3Copy it into your project.
Frequently asked questions
How are nested objects handled?
Each nested object gets its own named interface (based on its key), referenced from the parent — matching how you'd typically structure hand-written types.
What if a field could be more than one type?
The generator infers a type from the single sample value provided — it can't detect that a field might sometimes be null or a different type unless your sample shows that case.
Is my JSON uploaded anywhere?
No, the interface is generated entirely in your browser.