Comparison
Schemato vs quicktype
quicktype is one of the best-known tools for generating typed models from JSON-shaped data. Schemato is younger, smaller, and optimized for browser-first validation-library output and per-conversion URLs. Here's where each one wins.
Last reviewed: May 28, 2026. Sources are linked at the bottom of the page.
TL;DR
- • Use Schemato when you want Zod / Yup / Joi / Pydantic output, when you need OpenAPI / SQL / Protobuf / Prisma / Mongoose / Avro as input, or when you want a permalink for a specific X→Y pair.
- • Use quicktype when you need merge-multiple-samples inference, a mature CLI, VS Code workflow, runtime serializers, or one of its broader target languages.
- • They're complementary tools. Schemato is better for validation schemas and browser-first workflows; quicktype is better for mature CLI/library workflows and broad model generation.
Feature-by-feature
| Feature | Schemato | quicktype |
|---|---|---|
| Input formats | 10 (JSON, JSON Schema, OpenAPI 3.x, GraphQL SDL, SQL DDL, Protobuf, Prisma, TypeScript, Mongoose, Avro) | JSON, JSON API URLs, JSON Schema, TypeScript, GraphQL queries |
| Output languages | 15 (TS, Zod, Yup, Joi, Pydantic, Python dataclass, Go, Rust, Swift, Kotlin, Java, C#, Dart, PHP, Ruby) | 20+ (TypeScript, Go, Swift, Kotlin, C#, C++, Elm, Haskell, PHP, and more) |
| Zod / Yup / Joi / Pydantic outputs | Yes, first-class — these are the most-used outputs | Not listed as built-in target languages in the official README |
| Runs in browser without install | Yes — paste-and-go on a per-conversion URL | Yes — the official README calls the web app the most complete UI |
| Per-conversion URL (shareable) | Yes — every X→Y has its own page (good for pinning in docs) | Single tool URL with format pickers |
| Workflow-specific guides | Yes — guide pages for JSON → Zod, JSON → TypeScript, Go structs, Pydantic, OpenAPI, and SQL | Strong README and CLI examples; less focused on per-conversion walkthrough pages |
| Multi-sample inference (union of N JSONs) | Not yet — single sample today | Yes — the API accepts multiple JSON samples for a desired type |
| CLI | Not yet (planned) | Yes — `quicktype` is heavily CLI-driven |
| VS Code extension | Not yet (planned) | Yes |
| Open source | MIT, GitHub-hosted, intentionally small | Apache-2.0, mature GitHub project with a large codebase |
| Sample data privacy | Conversions run in the browser; pasted input is not uploaded to a Schemato conversion API | Official README says the web app works offline and does not send sample data over the Internet; CLI is local |
When Schemato is the better fit
You write Zod, Yup, Joi, or Pydantic. quicktype's official target-language list focuses on model and serializer output. Schemato treats validation libraries as first-class targets, which is useful for forms, API responses, env vars, and tRPC inputs.
You start from OpenAPI, SQL, Protobuf or Prisma. quicktype covers JSON, JSON Schema, TypeScript, and GraphQL queries. Schemato adds more source formats for teams whose source of truth is a database schema, ORM model, or service contract.
You want to paste a URL into your team wiki. Every X→Y in Schemato has a permanent URL — easy to drop into a runbook or onboarding doc.
When quicktype is the better fit
You have N samples and want a unified type. quicktype shines here. Schemato today is intentionally simple and only converts one pasted sample at a time.
You live in your terminal. quicktype's CLI is mature; Schemato's CLI is on the roadmap, not shipped.
You need broad model generation or serializers. quicktype targets more languages and can generate richer model / serializer code. Schemato focuses on the common typed-code and validation-schema outputs developers paste into apps.
Privacy and data handling
Both tools can be privacy-friendly. Schemato runs conversions in the browser and does not upload pasted input to a Schemato conversion API. The quicktype README says its web app works offline and does not send sample data over the Internet, and its CLI runs locally. If your payload contains secrets, customer data, private keys, or access tokens, the safest option is still to remove or redact that data before using any generator.
Try Schemato
Source notes
This comparison uses public quicktype materials and Schemato's current public feature set. If quicktype changes its target list or privacy language, this page should be updated.