Schema Builder
Build JSON schemas visually with field types, validation and presets
Templates
Popular Schemas
Build JSON schemas visually — add fields, set types and validation rules, and export valid JSON Schema Draft-7 ready for form validators, APIs, and config files.
Supported field types
| Type | Example value | Use for |
|---|---|---|
| string | "hello" | Names, emails, URLs, text |
| number | 42, 3.14 | Prices, counts, measurements |
| integer | 42 | IDs, counts (whole numbers only) |
| boolean | true / false | Toggles, flags |
| array | [1, 2, 3] | Lists of any other type |
| object | { "key": "value" } | Nested structured data |
| null | null | Explicitly nullable fields |
What is JSON Schema for?
- Validating API request and response bodies.
- Generating forms automatically from schemas.
- Documenting data structures in a standard format.
- Generating TypeScript types via tools like json-schema-to-typescript.
- Config file validation (e.g. package.json, VSCode settings).
Frequently asked questions
What is JSON Schema?
A vocabulary for describing the structure and constraints of JSON documents. Widely used for validation, documentation, and code generation.
Which version is supported?
JSON Schema Draft-7 — the most widely-compatible version for validators and tools.
Can I import existing schemas?
Yes — paste any JSON Schema and the visual editor loads it for editing.
Can I generate TypeScript from the schema?
Not yet in this tool, but you can export the schema and run it through json-schema-to-typescript.