JSON to TypeScript Type Generator
JSON input
JSON to TypeScript Type Generator
Paste sample JSON and get TypeScript interfaces with nested objects, arrays, and union types inferred automatically.
Features
Type inference
Infers string, number, boolean, null from values.
Nested structures
Recursive interfaces; array element types merged.
Custom root name
Rename the root interface (default Root).
FAQ
- How accurate are types?
- Based on sample data. Mixed shapes produce union types—use representative samples.
- Can I copy the output?
- Yes. One-click copy of generated TypeScript.