TypeMorph vs zod-to-json-schema
Updated
zod-to-json-schema and TypeMorph solve opposite problems. zod-to-json-schema converts Zod schemas to JSON Schema at runtime in your application code — essential for OpenAPI docs, tRPC, and Fastify integration. TypeMorph converts JSON data and JSON Schema into Zod (and 160+ other formats) for development-time code generation. They are complementary, not competing.
zod-to-json-schema is a widely-used runtime library that takes a z.ZodType and returns a JSON Schema Draft 7 object. It is the standard way to expose Zod schemas as JSON Schema for OpenAPI generators and validation libraries. TypeMorph is a development-time tool: it reads JSON responses or existing schemas and generates typed code. Both tools appear in TypeScript stacks, but at different stages of the workflow.
Use TypeMorph if
You are starting from JSON data or an OpenAPI spec and want to generate Zod, TypeScript, Go, Prisma, or any other typed format for your codebase.
Try TypeMorph freeUse zod-to-json-schema if
You already have a Zod schema in your codebase and need to convert it to JSON Schema at runtime — for OpenAPI documentation, tRPC, Fastify, or validation in other languages.
Visit zod-to-json-schemaFeature Comparison
| Feature | TypeMorph | zod-to-json-schema |
|---|---|---|
| Zod → JSON Schema (runtime) | ||
| JSON Schema → Zod | ||
| JSON → Zod v4 | ||
| OpenAPI → Zod | ||
| JSON → TypeScript / Go / Rust | ||
| JSON → Prisma / Drizzle / SQL | ||
| Semantic format inference (email/uuid) | ||
| Can be called from application code | ||
| Zod v4 support | ||
| Schema Quality Score | ||
| Web UI | ||
| CLI tool | ||
| Free & open source |
Where TypeMorph stands out
- Converts JSON data and JSON Schema into Zod v4 with semantic validators — email → z.email(), uuid → z.uuid(), url → z.url()
- 160+ output formats from the same input: TypeScript, Go, Rust, Prisma, SQL, MCP tool, OpenAI function, and more
- OpenAPI 3.x as input — generate Zod schemas from an existing API spec
- Development-time code generation with a Schema Quality Score (A–F)
- Web UI and VS Code Extension for instant conversion without a build step
Where zod-to-json-schema stands out
- Runtime conversion: call it in your application code to expose Zod schemas as JSON Schema for OpenAPI generators
- The standard solution for tRPC, Fastify JSON Schema validation, and similar integrations
- Handles Zod refinements, transforms, and metadata in the JSON Schema output
- Zero configuration — import the function and call zodToJsonSchema(schema)
Frequently asked
Can TypeMorph convert Zod to JSON Schema?
TypeMorph has a zod-to-json-schema converter page that shows the output, but it is not a runtime library you call in your application. For runtime Zod → JSON Schema in application code, use the zod-to-json-schema npm package.
Can I use TypeMorph to generate Zod from JSON Schema?
Yes. Paste any JSON Schema Draft 7 or 2020-12 into TypeMorph and select Zod v4 as the output format. This is the reverse of what zod-to-json-schema does.
What is the typical workflow combining both tools?
A common pattern: use TypeMorph to generate a Zod schema from an API response or OpenAPI spec (development time), then use zod-to-json-schema at runtime to expose that Zod schema in your OpenAPI documentation or tRPC router.
Does zod-to-json-schema support Zod v4?
Yes, recent versions of zod-to-json-schema support Zod v4. TypeMorph also outputs Zod v4 syntax (z.email(), z.iso.datetime()) when generating Zod from JSON input.