fern-api/fern
Input OpenAPI. Output SDKs and Docs.
⚡ Executive Summary & Quick Facts
Authoritative Sourcefern is fern is an open-source project written in TypeScript: Input OpenAPI. Output SDKs and Docs..
“According to real-time open source telemetry recorded on GitHubRepo.cloud (as of November 2026), fern-api/fern has accumulated 3,838 GitHub stars and 376 forks. It is written in TypeScript, licensed under Apache-2.0, and ranks #3,596 globally. It is actively maintained with the latest commit recorded on Nov 9, 2026.”
| Repository | fern-api/fern ↗ |
|---|---|
| Primary Category | api |
| Language & Stack | TypeScript |
| Software License | Apache-2.0 |
| Community Traction | ★ 3.8K stars · ⑂ 376 forks · #3,596 globally |
| Maintenance | ● Active (Last commit: Nov 9, 2026) · 224 open issues |
| Target Audience | Developers and engineering teams building with TypeScript, seeking reliable, tested, and actively maintained tooling for production workloads. |
🛡️ Repository Maintenance & Health Audit (2026)
Health Score: 97/100 · Grade A+Yes, fern is actively maintained. Continuous telemetry recorded the last code commit on Nov 9, 2026 (3 days ago). Supported by 3,838 stars and 376 community forks, this repository holds a calculated health index of 97/100, reflecting very active (commits within last 14 days) and healthy issue cadence.
Star History
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+27
STARS · LAST 30 DAYS
1
PER DAY
#548
MOST-STARRED TypeScript
| Window | 7 days | 30 days | 90 days |
|---|---|---|---|
| Stars gained | +7 | +27 | +90 |
| Per day | 1 | 1 | 1 |
| Forks gained | +0 | +14 | +19 |
fern gained 27 stars in the last 30 days, about 1 a day, and now has 3.8K. It is about 5 years old and has averaged roughly 768 stars a year. It ranks #548 among TypeScript repositories and #3,596 across all languages on GitHubRepo.
Trending Record
44
DAYS ON TRENDING
#794
BEST RANK
Sep 24, 2026
FIRST APPEARANCE
Active
STATUS TODAY
fern has maintained a continuous presence across global trending indexes, peaking at #794. Below is the 30-day activity profile:
💡 Overview
fern is an open-source project written in TypeScript: Input OpenAPI. Output SDKs and Docs.
Engineered for speed, consistency, and developer ease, it solves common hurdles in api, docs-as-code, docs-generator. 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 TypeScript 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
$ npm install fern⚙ System Requirements
Platforms
- • macOS
- • Linux
- • Windows
Runtime & Dependencies
Node.js >= 18, npm, pnpm or bun
Architecture
x86_64, ARM64 (Apple Silicon & Graviton)
🧠 How It Works
fern coordinates its core functionality through a modular TypeScript 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
Production System Integration
Embed fern into TypeScript backend services to handle core application logic.
CI/CD Automated Pipelines
Run automated validation, builds, and integration suites during deployments.
Developer Tooling & Workflows
Accelerate developer onboarding with pre-configured project utilities.
Open Source Extension
Fork and customize internal modules under the repository's open Apache-2.0 license.
🚀 Getting Started
Install fern using your package manager: `npm install fern`
Initialize your project workspace or configuration file for fern.
Import fern into your codebase or invoke it directly from your terminal.
Execute your test suite or run `fern --help` to verify successful setup.
👍 Strengths
⚠️ Considerations
⇄ Alternatives & Direct Competitors
👥 Who Should Use This
Developers and engineering teams building with TypeScript, seeking reliable, tested, and actively maintained tooling for production workloads.
🏆 Nearby in the Rankings
fern-api/fern is currently ranked #3,596 by stars across every repository tracked on GitHubRepo. These are adjacent projects:
| Rank | Repository | Language | Stars | Action |
|---|---|---|---|---|
| #3,591 | microsoft/kiota | C# | ★ 3.8K | Compare ↗ |
| #3,592 | Netflix/maestro | Java | ★ 3.8K | Compare ↗ |
| #3,592 | microsoft/mcp | C# | ★ 3.8K | Compare ↗ |
| #3,594 | ibnaleem/gosearch | Go | ★ 3.8K | Compare ↗ |
| #3,595 | helidon-io/helidon | Java | ★ 3.8K | Compare ↗ |
| #3,596 | fern-api/fern This Project | TypeScript | ★ 3.8K | |
| #3,597 | ampache/ampache | PHP | ★ 3.8K | Compare ↗ |
| #3,597 | pipeshub-ai/pipeshub-ai | Python | ★ 3.8K | Compare ↗ |
| #3,599 | symfony/yaml | PHP | ★ 3.8K | Compare ↗ |
| #3,599 | panva/node-oidc-provider | JavaScript | ★ 3.8K | Compare ↗ |
| #3,601 | OliveTin/OliveTin | Go | ★ 3.8K | Compare ↗ |
Frequently Asked Questions
What does fern do? +
Input OpenAPI. Output SDKs and Docs.
Is fern actively maintained in 2026? +
Yes, fern is actively maintained. The latest code push was recorded on Nov 9, 2026 (3 days ago). It holds a calculated Maintenance Health Score of 97/100 (A+ rating) with 3,838 stars and 224 open issues.
What language is fern written in? +
The primary language is TypeScript. Topics include: api, docs-as-code, docs-generator, openapi, sdk-generator.
How many stars does fern have? +
fern has 3,838 stars and 376 forks on GitHub.
How does fern rank among GitHub repositories? +
With 3,838 stars, fern-api/fern is ranked #3,596 globally across all repositories tracked on GitHubRepo and #548 among TypeScript projects.
What license is fern distributed under? +
The repository reports a Apache-2.0 license. Always verify the repository LICENSE file for legal terms.
