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Instantly convert JSON Schema specifications (Draft 4, Draft 7, and Draft 2020-12) into clean TypeScript interfaces, type aliases, and Zod runtime validation schemas. Supports nested objects, enums, required arrays, descriptions, sample presets, and 100% browser-local privacy.
Convert Draft 4/7/2020-12 specifications into type definitions & Zod schemas
// ==========================================
// 1. TypeScript Interface Definition
// ==========================================
/** Standard user account profile model with authorization roles and contact information. */
export interface UserProfile {
/** Unique user identifier (UUID v4 / KSUID) */
id: string;
/** Unique handle or screen name */
username: string;
/** Primary verified user email address */
email: string;
/** Account activation status */
isActive: boolean;
/** User age in years */
age?: number;
/** Assigned access control roles */
roles: ("admin" | "developer" | "editor" | "viewer")[];
profile?: UserProfile_Profile;
}
// ==========================================
// 2. Zod Runtime Validation Schema
// ==========================================
import { z } from "zod";
export const userProfileSchema = z.object({
id: z.string().describe("Unique user identifier (UUID v4 / KSUID)"),
username: z.string().min(3).max(30).describe("Unique handle or screen name"),
email: z.string().email().describe("Primary verified user email address"),
isActive: z.boolean().describe("Account activation status"),
age: z.number().int().min(18).max(120).describe("User age in years").optional(),
roles: z.array(z.enum(["admin", "developer", "editor", "viewer"])).describe("Assigned access control roles"),
profile: z.object({
firstName: z.string(),
lastName: z.string(),
avatarUrl: z.string().url().optional(),
bio: z.string().max(500).optional(),
socials: z.object({
github: z.string().optional(),
twitter: z.string().optional(),
}).optional(),
}).optional(),
}).describe("Standard user account profile model with authorization roles and contact information.");
export type UserProfile = z.infer<typeof userProfileSchema>;Test candidate JSON payload instances against your JSON Schema definition to verify property types, required fields, and enum rules.
Click "Validate Payload" to test candidate JSON against your JSON Schema rules.
Paste your W3C/IETF JSON Schema definition or load a pre-configured sample preset (User Profile, E-Commerce Product, or AI Agent Tool Input).
Select output mode (Interface + Zod, Interface Only, or Zod Only), set root type name, and toggle optional or readonly modifiers.
Copy formatted TypeScript & Zod code blocks directly to your clipboard, test sample candidate payload instances, or download `.ts` files.
Zero network transmission. Your API specifications, JSON Schema drafts, domain entities, and data models stay 100% inside local browser memory.
Compatible with modern W3C/IETF JSON Schema standards (`$schema`), including title, description, required arrays, format, and enum constraints.
Generate both static TypeScript interfaces/type aliases and Zod runtime validation schemas (`z.object({...})`) simultaneously.
Maps JSON Schema `enum`, `oneOf`, `anyOf`, and `type` arrays into TypeScript union types and Zod enums (`z.enum([...])` / `z.union([...])`).
Validate sample JSON payload instances against target schema rules in real time to catch type errors and missing required fields before deployment.
Load pre-configured production schemas (User Profile, E-Commerce Product, AI Agent Tool Input) and download ready-to-import `.ts` files.
Unlike third-party cloud tools that transmit API schemas over external networks, HiMat's JSON Schema to TypeScript & Zod Generator runs 100% locally in your web browser. Neither your JSON Schema definitions, property names, nor domain models leave your local device.
Our browser-local compiler analyzes your JSON Schema definition (Draft 4, 7, or 2020-12), extracts properties, required arrays, enums, formats, and descriptions, and compiles corresponding TypeScript interfaces and Zod schemas in real time.
No. The HiMat JSON Schema to TypeScript & Zod Generator operates 100% locally in your web browser. Neither your JSON Schema input, property names, nor generated TypeScript code are ever transmitted over the network.
Our tool supports standard JSON Schema Draft 4, Draft 7, and Draft 2020-12 specifications, parsing object properties, required arrays, string formats (email, uri), numeric limits, and enum arrays.
JSON Schema is ideal for cross-language API documentation, while Zod enables runtime validation in Next.js Server Actions, tRPC routers, and LLM structured function calling. Converting JSON Schema to Zod unites static type safety with runtime verification.
Yes, 100% free with no account registration required, no usage limits, and zero advertisements.
HiMat Technology designs and builds production Next.js App Router platforms, AI agent function calling integrations, multi-agent orchestrations, and secure backend systems with guaranteed code ownership.
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