Developer
TypeScript Type Generator
Generate TypeScript interfaces and types from pasted JSON examples locally in your browser.
Generated types are based on examples. Review optional fields, unions, nulls, dates, IDs, and domain-specific types before using them in production.
How to use TypeScript Type Generator
Best for
- Drafting TypeScript interfaces from API response samples.
- Turning JSON examples into readable types for docs, tests, and prototypes.
- Spotting mixed field types before writing stricter application models.
Steps
- Paste a JSON object or array into the input box.
- Name the root interface.
- Generate the TypeScript output, review inferred optional and union types, and copy it.
Notes
- Generated TypeScript is based on example data and should be reviewed before production use.
- Fields that are missing from some array items are marked optional.
FAQ
Does TypeScript Type Generator upload my JSON?
No. Type generation runs locally in your browser.
Why are some fields optional?
When an array contains objects with different keys, fields missing from at least one item are marked optional.