JSON to Zod: Generate TypeScript Validation Schemas Automatically
2026-04-29 6 min read
Zod is a TypeScript-first schema validation library that combines type inference with runtime validation. Our JSON to Zod converter generates schemas from JSON, giving you both compile-time types and runtime safety.
JSON to Zod Schema
JSON input
{
"id": 1,
"email": "alice@example.com",
"verified": true,
"role": "admin"
} Generated Zod schema
import { z } from "zod";
const UserSchema = z.object({
id: z.number(),
email: z.string().email(),
verified: z.boolean(),
role: z.enum(["admin", "user"])
});
type User = z.infer<typeof UserSchema>;Validation in Action
Parse and validate
// Valid data
const user = UserSchema.parse(data);
// Invalid data — throws ZodError
try {
UserSchema.parse({ id: "not-a-number", email: "invalid" });
} catch (err) {
console.error(err.errors); // detailed error info
}Perfect for NextJS API Routes
NextJS route handler
import { NextRequest, NextResponse } from "next/server";
export async function POST(req: NextRequest) {
const data = UserSchema.safeParse(await req.json());
if (!data.success) {
return NextResponse.json({ error: data.error }, { status: 400 });
}
// data.data is now typed as User
return NextResponse.json({ created: data.data });
}Generate Zod schemas
Paste your JSON and get TypeScript validation schemas instantly.