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TypeMorph vs json-to-ts

Updated

json-to-ts generates TypeScript interfaces from JSON with good nested-type extraction. TypeMorph covers the same use case and adds Zod v4 output, format inference (email/uuid/url/datetime), 160+ additional formats, a web UI, and a VS Code extension. Use json-to-ts if you want a zero-dependency function to call in Node.js code; use TypeMorph if you want richer output or a browser/CLI workflow.

json-to-ts is a well-known npm package that converts JSON to TypeScript interfaces. It handles nested objects cleanly and is easy to call programmatically. TypeMorph covers the same core conversion and extends it with semantic inference, 160+ output formats, a quality scorer, a VS Code extension, and a CLI. Here is an honest side-by-side.

Use TypeMorph if

You want Zod output, format inference (email/uuid/url/datetime), any non-TypeScript target (Go, Rust, Prisma, SQL…), a web UI, a VS Code extension, or a CLI for CI pipelines.

Try TypeMorph free

Use json-to-ts if

You want a tiny, zero-dependency npm function to call programmatically inside your own Node.js code and TypeScript interfaces are the only output you need.

Visit json-to-ts

Same JSON, different Zod

json-to-ts

interface RootObject {
  id: string;
  email: string;
  website: string;
  created_at: string;
  age: number;
}

TypeMorph

// TypeScript (TypeMorph)
export interface User {
  /** @format uuid */  id: string;
  /** @format email */ email: string;
  /** @format uri */   website: string;
  /** @format date-time */ created_at: string;
  age: number;
}

// Zod v4 (TypeMorph — extra format)
export const UserSchema = z.object({
  id: z.uuid(),
  email: z.email(),
  website: z.url(),
  created_at: z.iso.datetime(),
  age: z.number().int().min(0),
});

json-to-ts outputs clean TypeScript interfaces. TypeMorph adds JSDoc @format annotations to TypeScript output and generates Zod v4 with semantic validators from the same input.

Feature Comparison

FeatureTypeMorphjson-to-ts
JSON → TypeScript interfaces
Nested object extraction
Array handling
JSON → Zod v4
Detects email / uuid / url / datetime
int vs float detection
Enum inference from repeated values
JSON → Go / Rust / Python / Java
JSON → Prisma / Drizzle / SQL
OpenAPI / JSON Schema input
Total output formats160+TypeScript only
Schema Quality Score (A–F)
Breaking Change Detector
Web UI (no install)
VS Code Extension
CLI tool (npm)
Programmatic Node.js API
Free & open source

Where TypeMorph stands out

  • Detects email, uuid, url, and datetime formats — TypeScript output gains JSDoc comments and Zod gains semantic validators, where json-to-ts emits plain string
  • Zod v4 output with .email(), .uuid(), .url(), .iso.datetime() inferred from actual values
  • 160+ additional output formats from the same JSON — Go structs, Rust, Prisma, SQL, Protobuf, MCP tool, and more
  • Web UI at typemorph.dev — paste JSON, get TypeScript instantly, no npm install
  • VS Code Extension — convert any .json file with Ctrl+Shift+T without leaving your editor
  • Schema Quality Score and Breaking Change Detector for ongoing schema maintenance

Where json-to-ts stands out

  • Tiny zero-dependency library you can call programmatically in your own Node.js/TypeScript code
  • Clean nested interface extraction with automatic interface naming
  • Well-established with years of production use

Frequently asked

What is a json-to-ts alternative that also generates Zod?

TypeMorph converts JSON to both TypeScript interfaces and Zod v4 schemas from the same input, and it adds semantic validators (z.email(), z.uuid(), z.url()) that json-to-ts cannot produce.

Does json-to-ts work with OpenAPI or JSON Schema input?

No — json-to-ts accepts only raw JSON objects. TypeMorph also accepts OpenAPI 3.x specs and JSON Schema as input.

Can I use TypeMorph programmatically like json-to-ts?

TypeMorph ships a CLI (typemorph-cli) for scripting and CI, and a web UI for browser use. A programmatic Node.js API is on the roadmap but not available yet — for that use case json-to-ts remains the right choice.

Does json-to-ts detect email or UUID types?

No. json-to-ts infers only the JavaScript type (string, number, boolean). TypeMorph reads the actual values and annotates email, uuid, url, and datetime fields.