Fern - SDKs for your API ⚡

TLDR: Fern generates useful artifacts for your API, like SDKs, docs, and server code. Star us on GitHub! ⭐

Steve Yazicioglu, Head of Engineering at Candid Health (Series A)

Problem

When building APIs, we spent a lot of our time doing things like:

• Writing types & networking logic on the backend
• Communicating details of the API endpoints over Slack
• Re-writing the same types & networking logic on the frontend
• Re-writing the same types & networking logic in each SDK or client library
• Re-writing the same information in our docs & Postman Collection

Inevitably, these multiple sources of truth get out of sync, causing runtime bugs, wasted hours of debugging, and frustration.

Solution

Fern productizes schema-first API design. You define the schema of your API (or give us an OpenAPI spec) and we generate:

• SDKs in popular programming languages. Our SDKs feel handwritten. They can be used externally for customers or internally for your frontend/microservices.
• API docs that sync to your provider of choice.
• Postman Collection complete with examples of successful and unsuccessful requests
• Server-side validation to make sure that you serve the API you promised.

Fern also registers all versions of your API in a registry — no need to ping a coworker over Slack to understand how to consume an API.

With love 💌,
Team Fern 🌿 (Deep, and Danny)

Our asks

• Star us on GitHub!
• Read our blog about how Candid Health uses Fern
• Book a demo at www.buildwithfern.com

What our users are saying