TypeMorph vs json-to-zod

Updated 2026-06-24

Yes — TypeMorph is a json-to-zod alternative that detects formats. It reads your JSON and outputs z.email(), z.uuid(), z.url(), and z.iso.datetime() where json-to-zod emits plain z.string(), and it is actively maintained with current Zod v4 output. json-to-zod remains a fine tiny library for a rough scaffold you will refine by hand.

json-to-zod is a popular minimal library for turning a JSON object into a Zod schema. It infers basic types (string, number, boolean, arrays, nested objects) but stops there — emails, UUIDs, URLs, datetimes, and enums all come out as plain z.string(). It is also effectively unmaintained (last published years ago). TypeMorph reads the same JSON and infers the semantic formats and constraints. Here is an honest comparison.

Use TypeMorph if

You want Zod that already detects emails, UUIDs, URLs, datetimes, int-vs-float, and enums from your real JSON — plus TypeScript, Go, Prisma, OpenAPI/JSON Schema input, a schema quality score, breaking-change detection, and a maintained CLI.

Try TypeMorph free

Use json-to-zod if

You only need a tiny, zero-dependency function to call inside your own code for a rough JSON→Zod scaffold, and you are happy adding .email()/.uuid()/enum refinements by hand afterward.

Visit json-to-zod

Same JSON, different Zod

json-to-zod

const user = z.object({
  id: z.string(),
  email: z.string(),
  website: z.string(),
  created_at: z.string(),
  age: z.number(),
});

TypeMorph

// TypeMorph — formats inferred from the actual values
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).max(150),
});

json-to-zod infers only basic types — the UUID, email, URL, and timestamp all become z.string(). Same JSON input. The formats (uuid / email / url / datetime) are read from the values — facts. The numeric range on age is a name-based guess you can turn off.

Feature Comparison

Feature	TypeMorph	json-to-zod
JSON → Zod
Nested objects & arrays
Detects email → z.email()
Detects uuid → z.uuid()
Detects url → z.url()
Detects datetime → z.iso.datetime()
Infers enums from repeated values
int vs float & numeric ranges
Shared type extraction (.extend())
Zod v4 output
OpenAPI / JSON Schema input
Other outputs (TypeScript, Go, Prisma…)	160+	Zod only
Schema Quality Score (A–F)
Breaking Change Detector
CLI tool (npm)
Web UI (no install)		npm library
Actively maintained
Free & open to use

Where TypeMorph stands out

Detects semantic formats from real data — email → .email(), uuid → .uuid(), url → .url(), ISO datetimes, and enums from repeated values, where json-to-zod emits plain z.string()
Distinguishes int vs float and infers numeric ranges (e.g. latitude → .min(-90).max(90))
Extracts shared/nested types with .extend() inheritance instead of repeating inline shapes
Outputs 160+ formats beyond Zod — TypeScript, Go, Rust, Prisma, Drizzle, and more from the same JSON
Accepts OpenAPI and JSON Schema as input, not just raw JSON
Maintained, with a Schema Quality Score, Breaking Change Detector, VS Code extension, and a CLI (typemorph-cli) for CI

Where json-to-zod stands out

A tiny, zero-dependency library you can import and call programmatically inside your own JS/TS code
Open source (MIT) with simple, predictable output
Fine for a quick rough scaffold when you intend to refine the schema by hand anyway

Frequently asked

Is there a json-to-zod alternative that detects email and UUID formats?

Yes. TypeMorph reads your JSON values and outputs z.email(), z.uuid(), z.url(), and z.iso.datetime() where json-to-zod emits plain z.string().

Does json-to-zod support Zod v4?

json-to-zod is effectively unmaintained (last published years ago) and predates Zod v4. TypeMorph outputs current Zod v4 syntax such as z.email() and z.iso.datetime().

Can I use TypeMorph from the command line like json-to-zod?

Yes — install typemorph-cli from npm and run "typemorph zod response.json". It also runs in CI for breaking-change detection and output validation.

Is TypeMorph free and local?

Yes. The web app is free and converts 100% in your browser — your JSON never leaves the tab.