JSON to TypeScript Interface
Generate TypeScript interfaces from JSON. Paste your JSON, set the root interface name, and get clean typed definitions instantly.
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Help & answers
Frequently Asked Questions
What does JSON to TypeScript generate?
It converts example API JSON into TypeScript interface definitions with correctly typed fields, nested interfaces for objects, and typed array fields — ready to paste into your project.
Should I use real API output or a made-up example?
Always use real API output. Real responses expose optional fields, null values, and nested structures that a made-up example often misses, leading to type errors at runtime.
How do I handle nullable or optional fields?
Review the generated interface and mark fields that may be absent with ? for optional or string | null for nullable. The generator makes a best guess from your example but you should verify against the full API contract.
Can I use the generated interfaces immediately in my project?
Yes. Paste the output into a .ts types file and import it where you use the API data. When the API changes, regenerate from fresh output and compare the diff before updating consuming code.
Important disclaimer: Alexonic Tools is completely free to use. There is no charge, and we do not save tool inputs or generated results. We value customer privacy and keep building and fixing each day. Always verify important financial, payroll, legal, tax, business, or production-code results before relying on them. If you see an issue, need a tool, or require an update, send feedback to the developer.