How does this tool infer nested object types?

The engine recursively traverses the JSON AST, extracting each child object into an independent, PascalCase-named interface/struct (e.g. Address, Metadata) to promote clean type modularity.

Are Zod schemas generated with runtime inference types?

Yes. Every generated Zod schema includes both the runtime schema definition (`export const UserSchema = z.object({...})`) and the static TypeScript inferred type (`export type User = z.infer `).

How are Python naming conventions handled (camelCase to snake_case)?

The Python and Rust generators automatically translate JavaScript camelCase keys (e.g. `isVerified`) into idiomatic snake_case identifiers (`is_verified`) while preserving serialization contracts.

Is my proprietary API JSON sent to external servers?

No. All AST parsing, schema inference, and code generation execute entirely client-side inside your web browser’s JavaScript engine.

Developer Tools

JSON to Types Online

Transform JSON objects into strongly typed TypeScript interfaces, Zod validation schemas, Python dataclasses, Rust structs, and Go structs with 100% client-side privacy.

Quick Answer & Summary

The JSON to Types Online is a fast, accurate Developer Tools utility designed to transform json objects into strongly typed typescript interfaces, zod validation schemas, python dataclasses, rust structs, and go structs with 100% client-side privacy. entirely in your browser with zero server data storage.

JSON to Multi-Language Type Generator

Generate strongly typed TypeScript interfaces, Zod runtime validation schemas, Python dataclasses, Rust structs, and Go structs from arbitrary JSON.

Target Language

Root Type Name

Make Properties Optional

JSON Input

Generated TYPESCRIPT Types (2)

export interface UserProfile {
  id: string;
  name: string;
  email: string;
  role: string;
  active: boolean;
  metadata: Metadata;
  permissions: string[];
}

export interface Metadata {
  lastLogin: string;
  ipAddress: string;
  sessionCount: number;
}

Type Systems, Polyglot Architecture & API Contract Safety

In modern polyglot microservice architectures, data contracts frequently cross language boundaries between frontend clients (TypeScript/React), backend microservices (Go/Rust), and data science pipelines (Python). Converting unstructured JSON API payloads into strict compile-time types prevents runtime exceptions, unhandled null pointers, and schema drift.

Language Idioms & Type Mapping

TypeScript: Generates strict interface contracts with primitive mappings (string, number, boolean, Array<T>) and recursive child interfaces.
Zod: Produces runtime validation schemas (z.object, z.string().email(), z.array()) coupled with static type inference.
Python: Uses PEP 557 @dataclass decorators and PEP 484 type hints (List, Optional, Any).
Rust: Outputs memory-safe structs with Serde derive macros (Serialize, Deserialize) and strong numerical distinction (i64 vs f64).
Go: Generates PascalCase struct fields with explicit struct field tags (`json:"fieldName"`).

100% In-Browser Privacy

Whether you are converting confidential production JSON payloads or internal database dumps, all AST traversal and code emissions execute locally in browser RAM without server interaction.

Share This Tool

Help your team and fellow developers save time with free, private client-side utilities.

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Toolbox Editorial TeamVerified Authors

Systems & Security Engineers • Applied Cryptography & High-Performance Web Tools

Updated: September 2026

100% In-BrowserZero server storage

Standards AuditedRFC & ISO compliant

Peer ReviewedEditorial Policy

Documentation & Guide

How to Use JSON to Types Online

Paste or Load JSON Payload

Paste your sample JSON API response, config file, or database record into the input editor.

Select Target Language

Choose your desired programming language: TypeScript, Zod, Python Dataclasses, Rust Serde, or Go.

Customize Type Properties

Define the Root Type name and toggle optional property annotations (? / Option<T> / Optional[T]).

Copy or Export Code

Click Copy to clipboard or export directly to a .ts, .py, .rs, or .go source file.

Practical Examples & Conversions

Input

{"id": 1, "name": "Alice", "address": {"city": "Metropolis"}}

Output

export interface UserProfile {
  id: number;
  name: string;
  address: Address;
}

Frequently Asked Questions (PAA)

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Authoritative Standards & Citations

Calculations and algorithms on this page are implemented and verified in strict accordance with the following official technical specifications:

IETF (Internet Engineering Task Force)

RFC 7519: JSON Web Token (JWT)

Standardized compact, URL-safe means of representing claims to be transferred between two parties.

W3C Recommendation

Web Cryptography API Specification

Standard JavaScript API for performing basic cryptographic operations in web applications.

IETF Standards Track

RFC 4122: A Universally Unique IDentifier (UUID) URN Namespace

Definition of uniform format and generation algorithms for UUIDs.