Paste strict JSON
The sample stays inside the no-network capsule.
Private JSON type inference
Generate TypeScript types from JSON without uploading it
TypeDraft parses one bounded strict-JSON sample in an isolated no-network capsule. It creates deterministic nested declarations, merges array object shapes, marks absent properties optional and keeps null visible in unions.
No account · no upload · interfaces or type aliases · copy or download
Three explicit steps
Paste, configure, review
Choose the declaration style
Use interfaces or type aliases, with explicit export and readonly options.
Review the inferred draft
Compare it with the real schema before committing it.
Developer workflow
Useful for a fast, reviewable starting point
- Draft API response types from representative fixtures.
- Merge differing object keys found in one JSON array.
- Compare interface and type-alias output before adapting it to the codebase.
Private by construction
Generate the draft in this browser
Paste a representative sample, inspect every inferred choice and copy only the reviewed output.