How to use the JSON Schema Generator
1. Paste a sample JSON object that represents the shape of your data.
2. Click Generate Schema — a draft-07 JSON Schema is created with types, required fields, and format hints.
3. Copy the schema and use it in your API validation, form generation, or documentation.
What is it?
JSON Schema is a vocabulary for annotating and validating JSON documents (draft-07 / 2019-09 / 2020-12). It's used by OpenAPI/Swagger specs, form generators (react-jsonschema-form), API validators, and code generators. This tool infers types, required fields, nested object shapes, and common string formats (email, date-time, UUID, URI) from your sample data.
Benefits
Spot structural bugs at a glance
Formatted output reveals missing brackets, extra commas, and misaligned blocks that are completely invisible in minified or compressed code.
Faster code reviews
Reviewers focus on logic and correctness instead of deciphering indentation. Paste formatted output directly into PRs, issue comments, or Slack.
Documentation-ready output
Well-formatted JSON, SQL, XML, and YAML paste cleanly into READMEs, API docs, Confluence pages, and Notion without additional reformatting.
Editor-independent cleanup
Format any file from any source in seconds — no Prettier config, no ESLint setup, no language-specific formatter to install and configure.
Frequently asked questions
What formats does it detect?
email, uri, date (YYYY-MM-DD), date-time (ISO 8601), and uuid — detected by pattern matching on string values.
Should I use this schema as-is in production?
Use it as a starting point. Review and adjust optional fields (not everything in your sample may always be required), add minLength/maxLength constraints, and review additionalProperties settings.