⚡ Executive Summary & Quick Facts
Authoritative Sourcejson is json is an open-source project written in C++: JSON for Modern C++..
“According to real-time open source telemetry recorded on GitHubRepo.cloud (as of November 2026), nlohmann/json has accumulated 50,838 GitHub stars and 7,517 forks. It is written in C++, licensed under MIT, and ranks #270 globally. It is actively maintained with the latest commit recorded on Nov 4, 2026.”
| Repository | nlohmann/json ↗ |
|---|---|
| Primary Category | bson |
| Language & Stack | C++ |
| Software License | MIT |
| Community Traction | ★ 50.8K stars · ⑂ 7.5K forks · #270 globally |
| Maintenance | ● Active (Last commit: Nov 4, 2026) · 20 open issues |
| Target Audience | Developers and engineering teams building with C++, seeking reliable, tested, and actively maintained tooling for production workloads. |
🛡️ Repository Maintenance & Health Audit (2026)
Health Score: 100/100 · Grade A+Yes, json is actively maintained. Continuous telemetry recorded the last code commit on Nov 4, 2026 (10 days ago). Supported by 50,838 stars and 7,517 community forks, this repository holds a calculated health index of 100/100, reflecting very active (commits within last 14 days) and healthy issue cadence.
Star History
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+79
STARS · LAST 30 DAYS
3
PER DAY
#13
MOST-STARRED C++
| Window | 7 days | 30 days | 90 days |
|---|---|---|---|
| Stars gained | +0 | +79 | +270 |
| Per day | 1 | 3 | 3 |
| Forks gained | +0 | +0 | +376 |
json gained 79 stars in the last 30 days, about 3 a day, and now has 50.8K. It is about 13 years old and has averaged roughly 3.9K stars a year. It ranks #13 among C++ repositories and #270 across all languages on GitHubRepo.
Trending Record
35
DAYS ON TRENDING
#1050
BEST RANK
Oct 6, 2026
FIRST APPEARANCE
Active
STATUS TODAY
json has maintained a continuous presence across global trending indexes, peaking at #1050. Below is the 30-day activity profile:
💡 Overview
json is an open-source project written in C++: JSON for Modern C++.
Engineered for speed, consistency, and developer ease, it solves common hurdles in bson, cbor, header-only. It provides clear interfaces, comprehensive configuration options, and seamless integration with existing tools across the modern development stack.
⚡ Key Features
Optimized execution pipeline written in C++ for predictable speed.
Zero-friction configuration with comprehensive sensible defaults out of the box.
Cross-platform runtime support across Linux, macOS, and Windows environments.
Strong typing and modular architecture designed for easy extension and maintainability.
Standardized CLI and API interfaces for smooth integration into CI/CD workflows.
Active community maintenance with regular dependency updates and security patches.
📥 Installation
$ git clone https://github.com/nlohmann/json.git
cd json⚙ System Requirements
Platforms
- • macOS
- • Linux
- • Windows
Runtime & Dependencies
C++20 compliant compiler (GCC 11+, Clang 13+, MSVC)
Architecture
x86_64, ARM64 (Apple Silicon & Graviton)
🧠 How It Works
json coordinates its core functionality through a modular C++ pipeline. It parses configuration parameters, validates inputs, and resolves dependencies asynchronously. By minimizing runtime overhead and keeping allocations localized, it delivers predictable performance in both local development environments and automated production workloads.
🎯 Production Use Cases
Autonomous AI Agents
Orchestrate intelligent workflows and tool-calling routines with json.
Model Inference & Prompting
Integrate fast, local or cloud-hosted generative AI models directly into production code.
Context Memory & RAG
Augment language models with dynamic vector retrieval and structured project memory.
Developer Productivity
Automate repetitive engineering tasks, code generation, and test creation using AI agents.
🚀 Getting Started
Install json using your package manager: `git clone https://github.com/nlohmann/json.git`
Initialize your project workspace or configuration file for json.
Import json into your codebase or invoke it directly from your terminal.
Execute your test suite or run `json --help` to verify successful setup.
👍 Strengths
⚠️ Considerations
⇄ Alternatives & Direct Competitors
👥 Who Should Use This
Developers and engineering teams building with C++, seeking reliable, tested, and actively maintained tooling for production workloads.
🏆 Nearby in the Rankings
nlohmann/json is currently ranked #270 by stars across every repository tracked on GitHubRepo. These are adjacent projects:
| Rank | Repository | Language | Stars | Action |
|---|---|---|---|---|
| #265 | moeru-ai/airi | TypeScript | ★ 51.3K | Compare ↗ |
| #266 | astral-sh/ruff | Rust | ★ 51.2K | Compare ↗ |
| #267 | apple/container | Swift | ★ 51K | Compare ↗ |
| #268 | cypress-io/cypress | TypeScript | ★ 51K | Compare ↗ |
| #269 | ClickHouse/ClickHouse | C++ | ★ 50.9K | Compare ↗ |
| #270 | nlohmann/json This Project | C++ | ★ 50.8K | |
| #271 | TanStack/query | TypeScript | ★ 50.4K | Compare ↗ |
| #272 | Homebrew/brew | Ruby | ★ 50.4K | Compare ↗ |
| #273 | pandas-dev/pandas | Python | ★ 50.3K | Compare ↗ |
| #274 | huginn/huginn | Ruby | ★ 50.1K | Compare ↗ |
| #275 | mudler/LocalAI | Go | ★ 50.1K | Compare ↗ |
Frequently Asked Questions
What does json do? +
JSON for Modern C++
Is json actively maintained in 2026? +
Yes, json is actively maintained. The latest code push was recorded on Nov 4, 2026 (10 days ago). It holds a calculated Maintenance Health Score of 100/100 (A+ rating) with 50,838 stars and 20 open issues.
What language is json written in? +
The primary language is C++. Topics include: bson, cbor, header-only, json, json-diff.
How many stars does json have? +
json has 50,838 stars and 7,517 forks on GitHub.
How does json rank among GitHub repositories? +
With 50,838 stars, nlohmann/json is ranked #270 globally across all repositories tracked on GitHubRepo and #13 among C++ projects.
What license is json distributed under? +
The repository reports a MIT license. Always verify the repository LICENSE file for legal terms.
