JSON Schema to TypeScript Converter
Paste an actual JSON Schema document to instantly generate matching TypeScript interfaces, reading type, properties, required, and items keywords directly. Free online developer tool.
Paste a JSON Schema document
TypeScript Interfaces
Interface definitions will appear here...
Free JSON Schema to TypeScript Converter
Paste an actual JSON Schema document — not a plain JSON data sample — to instantly generate matching TypeScript interface declarations. This tool reads type,properties, required, and items keywords directly from your schema, so it works even for fields your schema declares but that don't appear in any sample data.
How to Use It
Paste a draft-07-style JSON Schema object into the input box, or click "Load Example Schema" to see a sample run. The tool converts your schema's type/properties/required/items keywords into the same internal shape used by this site's JSON-to-TypeScript converter, then reuses that exact converter to generate one interface per object level, with nested objects pulled into their own named interfaces.
Example
Given a schema with properties: { name: { type: "string" }, age: { type: "integer" } }and required: ["name"], the tool generates interface Root { name: string; age?: number; }— age is marked optional because it wasn't listed in required.
Common Use Cases
- Generating TypeScript types directly from an API's published JSON Schema / OpenAPI definitions.
- Typing a config file that's validated against a JSON Schema, without hand-writing interfaces.
- Keeping frontend types in sync with a backend's JSON Schema contract.
- Converting a schema-driven form definition into matching TypeScript types.
FAQs
How is this different from the JSON to TypeScript tool?
The JSON to TypeScript tool reads a plain JSON data sample and infers types from the actual values it finds. This tool instead reads a real JSON Schema document and uses its explicittype/required declarations — no data sample needed, since the schema already states the types directly.
Which JSON Schema keywords are supported?
The converter reads type (as a string or as an array like ["string", "null"]for nullable fields), properties, required, and items. Other validation keywords like pattern or minimum don't have a TypeScript equivalent and are ignored.
Is my schema uploaded anywhere?
No — parsing and type generation happen entirely client-side in your browser. Nothing you paste is sent to a server.