GraphQL → Zod Schema
Paste your GraphQL type,
input, and
enum
definitions and instantly generate
type-safe Zod schemas.
import { z } from 'zod';
export const RoleSchema = z.enum(["ADMIN", "EDITOR", "VIEWER"]);
export const StatusSchema = z.enum(["DRAFT", "PUBLISHED", "ARCHIVED"]);
export const UserSchema = z.object({
id: z.string(),
name: z.string(),
email: z.string().optional(),
age: z.number().optional(),
isActive: z.boolean(),
role: RoleSchema,
posts: z.array(PostSchema),
});
export const PostSchema = z.object({
id: z.string(),
title: z.string(),
content: z.string().optional(),
published: z.boolean(),
viewCount: z.number().optional(),
tags: z.array(z.string()).optional(),
});
export const CreateUserInputSchema = z.object({
name: z.string(),
email: z.string(),
age: z.number().optional(),
role: RoleSchema.optional(),
});Why Convert GraphQL to Zod?
Runtime Validation for GraphQL
GraphQL provides compile-time type safety, but it doesn't validate data at runtime in your TypeScript code. Zod bridges this gap by letting you validate API responses, form inputs, and resolver arguments against the same type structure defined in your GraphQL schema — catching bugs before they reach production.
Type Inference with Zero Duplication
With Zod's z.infer<typeof Schema>, you get
full TypeScript types derived directly from your validation schemas. Convert your
GraphQL types once and get both runtime validation and
compile-time type checking without maintaining duplicate type
definitions.
Common Use Cases
- Validate GraphQL API responses at runtime
- Generate Zod schemas from existing GraphQL SDL
- Type-safe form validation matching your API types
- Validate webhook payloads against GraphQL types
- Bridge GraphQL enums to Zod string unions
- Create shared validation between frontend and backend
- Validate resolver inputs in GraphQL servers
- Generate TypeScript types from GraphQL via Zod inference
- Enforce data contracts across microservices
How It Works
This tool parses your GraphQL schema entirely in the browser and converts each definition into a Zod validation schema:
String / ID→z.string()Int / Float→z.number()Boolean→z.boolean()enum Role { ADMIN USER }→z.enum(["ADMIN", "USER"])[String!]!→z.array(z.string())[String!]→z.array(z.string()).optional()String!(required) →z.string()String(nullable) →z.string().optional()
Enums are output first so they can be referenced by subsequent type and input schemas.
Custom type references (e.g. User) are converted to
schema references (UserSchema).
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