Open source json projects

Every project in the registry tagged json, ranked by real GitHub adoption.

projects 36 combined stars ★ 386K refresh nightly
01 fastapi ★ 105K

FastAPI framework, high performance, easy to learn, fast to code, ready for production

last push19 hours ago languagePython licenseMIT
02 prettier ★ 52K

Prettier is an opinionated code formatter.

last push14 hours ago languageJavaScript licenseMIT
03 redisson ★ 24K

Redisson: Valkey & Redis Java Client and Real-Time Data Platform. Sync/Async/RxJava/Reactive API. Over 50 Valkey and Redis based Java objects and services: Set,

last push22 hours ago languageJava licenseApache-2.0
04 lowdb ★ 23K

Simple and fast JSON database

last push7 months ago languageJavaScript licenseMIT
05 amis ★ 19K

前端低代码框架,通过 JSON 配置就能生成各种页面。

last push8 months ago languageTypeScript licenseApache-2.0
06 telegraf ★ 18K

Agent for collecting, processing, aggregating, and writing metrics, logs, and other arbitrary data.

last push16 hours ago languageGo licenseMIT
07 outlines ★ 16K

Structured Outputs

last push1 months ago languagePython licenseApache-2.0
08 opa ★ 12K

Open Policy Agent (OPA) is an open source, general-purpose policy engine.

last push14 hours ago languageGo licenseApache-2.0
09 Manticore Search ★ 12K

Lightning-fast open source search engine for big data

last push16 hours ago languageC++ licenseGPL-3.0
10 jsonhero-web ★ 11K

JSON Hero is an open-source, beautiful JSON explorer for the web that lets you browse, search and navigate your JSON files at speed. 🚀. Built with 💜 by the Tr

last push11 months ago languageTypeScript licenseApache-2.0
11 server ★ 8.5K

MariaDB server is a community developed fork of MySQL server. Started by core members of the original MySQL team, MariaDB actively works with outside developers

last push13 hours ago languageC++ licenseGPL-2.0
12 tinydb ★ 7.6K

TinyDB is a lightweight document oriented database optimized for your happiness :)

last push8 days ago languagePython licenseMIT
13 wiremock ★ 7.4K

A tool for mocking HTTP services

last push23 hours ago languageJava licenseApache-2.0
14 NLog ★ 6.5K

NLog - Flexible and Structured Logging for various .NET Platforms

last push36 hours ago languageC# licenseBSD-3-Clause
15 Jantt ★ 6.2K

The AI-native JSON Gantt chart engine. Dependency-free interactive timelines with React, script-tag, CLI, topological DAG solver, and formal JSON schema.

last push22 hours ago languageTypeScript licenseMIT
16 typia ★ 6.0K

Super-fast/easy runtime validators and serializers via transformation

last push28 hours ago languageTypeScript licenseMIT
17 ponzu ★ 5.8K

Headless CMS with automatic JSON API. Featuring auto-HTTPS from Let's Encrypt, HTTP/2 Server Push, and flexible server framework written in Go.

last push12 months ago languageGo licenseBSD-3-Clause
18 survey-library ★ 4.9K

Open-source JavaScript form library for React, Angular, Vue, and plain JavaScript. Render dynamic JSON-driven forms, multi-step form wizards, surveys, quizzes,

last push14 hours ago languageTypeScript licenseMIT
19 react-docgen ★ 3.8K

A CLI and library to extract information from React component files for documentation generation purposes.

last push15 hours ago languageTypeScript licenseMIT
20 gojq ★ 3.8K

Pure Go implementation of jq

last pushyesterday languageGo licenseMIT
21 toapi ★ 3.6K

Every web site provides APIs.

last push2 months ago languagePython licenseMIT
22 hl ★ 3.3K

A fast and powerful log viewer and processor that converts JSON logs or logfmt logs into a clear human-readable format.

last push29 hours ago languageRust licenseMIT
23 php-curl-class ★ 3.3K

PHP Curl Class makes it easy to send HTTP requests and integrate with web APIs

last push23 hours ago languagePHP licenseUnlicense
24 neo ★ 3.3K

Neo.mjs is a self-evolving software organism: a professional end-to-end AI engineering team whose cross-model swarm inhabits live apps via Neural Link, Active H

last push17 hours ago languageJavaScript licenseMIT
25 spectral ★ 3.2K

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

last push4 days ago languageTypeScript licenseApache-2.0
26 uvicorn-gunicorn-fastapi-docker ★ 2.9K

Docker image with Uvicorn managed by Gunicorn for high-performance FastAPI web applications in Python with performance auto-tuning.

last push4 days ago languagePython licenseMIT
27 keystatic ★ 2.5K

First class CMS experience, TypeScript API, Markdown & YAML/JSON based, no DB

last push1 months ago languageTypeScript licenseMIT
28 WebApiClient ★ 2.1K

A REST API library with better functionality, performance, and scalability than refit

last push4 months ago languageC# licenseMIT
29 standard-webhooks ★ 1.8K

The Standard Webhooks specification

last push4 days ago languageJava licenseApache-2.0
30 tslog ★ 1.8K

📝 tslog - Universal Logger for TypeScript and JavaScript

last push4 days ago languageTypeScript licenseMIT
31 bludit ★ 1.5K

Simple, Fast, Secure, Flat-File CMS

last push40 hours ago languagePHP licenseMIT
32 URS ★ 1.0K

Universal Reddit Scraper - A comprehensive Reddit scraping/archival command-line tool.

last push4 months ago languagePython licenseMIT
33 zerocode ★ 1.0K

zerocode-tdd is a community-developed, free, open-source, outcome-driven automated testing framework for Data Pipelines, ETL, REST API, Kafka(Data Streams), Dat

last push3 days ago languageJava licenseApache-2.0
34 airframe ★ 666

Essential Building Blocks for Scala

last push2 days ago languageScala licenseApache-2.0
35 UStore ★ 646

Multi-Modal Database replacing MongoDB, Neo4J, and Elastic with 1 faster ACID solution, with NetworkX and Pandas interfaces, and bindings for C 99, C++ 17, Pyth

last push3 days ago languageC++ licenseApache-2.0
36 file.d ★ 507

A blazing fast tool for building data pipelines: read, process and output events. Our community: https://t.me/file_d_community

last push22 hours ago languageGo licenseBSD-3-Clause

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Frequently asked questions

How many open source json projects are there?

This registry tracks 36 projects tagged json, with 385,800 GitHub stars between them. The most-adopted is fastapi at 104,566 stars.

Are these json projects free to use?

Yes — 36 of the 36 carry an explicit open-source licence across 6 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 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 projects still maintained?

30 of the 36 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.