Open source json-schema projects
Every project in the registry tagged json-schema, ranked by real GitHub adoption.
FastAPI framework, high performance, easy to learn, fast to code, ready for production
Super-fast/easy runtime validators and serializers via transformation
Huma REST/HTTP API Framework for Golang with OpenAPI 3.1
Generate Pydantic v2 models, dataclasses, TypedDict, and msgspec.Struct from OpenAPI, JSON Schema, GraphQL, Avro, Protobuf, and raw JSON/YAML/CSV.
A flexible JSON/YAML linter for creating automated style guides, with baked in support for OpenAPI (v3.1, v3.0, and v2.0), Arazzo v1.0, as well as AsyncAPI v2.x
Docker image with Uvicorn managed by Gunicorn for high-performance FastAPI web applications in Python with performance auto-tuning.
Related tags
Frequently asked questions
How many open source json-schema projects are there?
This registry tracks 6 projects tagged json-schema, with 122,864 GitHub stars between them. The most-adopted is fastapi at 102,409 stars.
Are these json-schema projects free to use?
Yes — 6 of the 6 carry an explicit open-source licence across 2 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which json-schema project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these json-schema projects still maintained?
6 of the 6 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.