JSON → Types Generator
Infers type definitions from a JSON sample: paste any JSON and get TypeScript interfaces, Python dataclasses or Go structs, with nested objects broken out into their own named types.
Runs 100% in your browser — your files never leave your device.
Read the full guide to this tool
Notes
- Types are inferred from one sample, so a field that happens to be null or missing here may need widening by hand.
- Arrays infer their element type from all elements; mixed arrays fall back to a union or "any".
- Runs 100% in your browser — your files and data never leave your device.
Related tools
Test Data Generator
Fake names, emails, addresses — CSV or JSON datasets.
XML Formatter & Validator
Pretty-print, minify and validate XML.
iCalendar Generator & Parser
Create .ics event files and inspect existing ones.
vCard Generator & Parser
Create .vcf contact files and inspect existing ones.
Auto Analyst: Instant Statistical Report
Drop a CSV or Excel file and get a statistician’s report: data problems, distributions, every real relationship, key drivers and Simpson’s paradox warnings, in plain English.
CSV Viewer & Editor
View, edit, sort, filter and extract columns from CSV files.