JSON Schema to Zod Converter
Paste an actual JSON Schema document to instantly generate a matching Zod validation schema, reading type, properties, required, and items keywords directly. Free online developer tool.
Paste a JSON Schema document
Zod Schema
Zod schema definitions will appear here...
Free JSON Schema to Zod Converter
Paste an actual JSON Schema document — not a plain JSON data sample — to instantly generate a matching Zod validation schema. 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-Zod converter, then reuses that exact converter to generate onez.object({...}) per object level, with nested objects pulled into their own named schemas.
Example
Given a schema with properties: { name: { type: "string" }, age: { type: "integer" } }and required: ["name"], the tool generatesconst RootSchema = z.object({ name: z.string(), age: z.number().int().optional() });— age gets .optional() because it wasn't listed in required.
Common Use Cases
- Generating runtime Zod validators directly from an API's published JSON Schema definitions.
- Validating form or config input against the same rules described by an existing JSON Schema.
- Keeping a TypeScript backend's Zod validators in sync with a JSON Schema contract.
- Bootstrapping request/response validation for an endpoint that's already documented with JSON Schema.
FAQs
How is this different from the JSON to Zod Schema tool?
The JSON to Zod Schema 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 automatically become Zod refinements and are ignored — add those by hand if you need them.
Is my schema uploaded anywhere?
No — parsing and schema generation happen entirely client-side in your browser. Nothing you paste is sent to a server.