🔒 Runs in your browser — nothing is uploaded✓ Free, no signup
JSON to Zod Schema Generator
Paste JSON to generate Zod schemas that validate data at runtime, plus TypeScript types inferred with z.infer. Nested objects become reusable schemas.
0 characters
Zod schema
When should you use the JSON to Zod?
- Validating API responses at runtime in a TypeScript app
- Creating form or request-body validation for Next.js and tRPC
- Getting types and validation from one source of truth
How to use the JSON to Zod
- 1
Paste JSON
Paste a sample object or array.
- 2
Name the schema
Change Root to something like User — you'll get UserSchema and a User type.
- 3
Choose types
Keep 'Export TypeScript types' on to add z.infer types.
- 4
Copy into your project
Copy the schemas or download schema.ts.
Examples
Optional field from array items
JSON
{
"orders": [
{ "id": 1, "total": 9.5 },
{ "id": 2, "total": 20, "coupon": "SAVE" }
]
}Zod
export const OrderSchema = z.object({
id: z.number().int(),
total: z.number(),
coupon: z.string().optional(),
});
export const RootSchema = z.object({
orders: z.array(OrderSchema),
});Common errors and how to fix them
A field is z.unknown()- The sample only had null or an empty array there. Use a sample with a real value, or edit the schema by hand.
Validation fails for real data- Your sample may not show every variation. Add .optional() or .nullable() where real data can differ.
More from JSON Tools
Free tools that run in your browser — no signup, nothing uploaded.
JSON Auto-Fixer & Formatter
Repair, validate, and beautify broken JSON (missing quotes, trailing commas).
JSON Validator & Linter
Check JSON syntax and see the exact line and column of every error.
JSON Viewer (Tree)
Explore JSON as a collapsible tree with search and click-to-copy paths.
JSON Editor
Edit JSON with live validation, a tree view, formatting and key sorting.
JSON Beautifier
Pretty-print and indent JSON for easy reading and debugging.
JSON Compare & Diff Tool
Find the difference between two JSON objects visually and quickly.
JSON Sorter (Sort Keys)
Sort JSON object keys alphabetically, including nested objects.
JSONPath Tester
Evaluate JSONPath expressions with filters and recursive queries.
JSON Schema Generator
Generate a JSON Schema from any sample JSON document.
JSON to Zod FAQ
A TypeScript-first validation library. You define a schema once and get both runtime validation (schema.parse(data)) and a static type (z.infer<typeof schema>).
Keys missing from some array items get .optional(), and fields that are null in the sample get .nullable().
Whole numbers become z.number().int() and decimals z.number().
Yes. The generated schemas use core APIs — z.object, z.array, z.union, .optional() and .nullable() — that both versions support.
Arrays with different value types become z.array(z.union([...])).
No. Everything runs in your browser, so your JSON never leaves your device.