How to Document Your SaaS API for Developers
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EngineeringMay 4, 20265 min read

How to Document Your SaaS API for Developers

We wrote terrible docs once. Nobody integrated. Here's how to do it right.

The Documentation Mistake

We built a powerful API. Nobody used it.

Why? Our docs were terrible.

Here's how to do it right.


What Developers Actually Need

1. Authentication

How do I get an API key? How do I use it?

Clear examples. Copy-pasteable code.

2. The Core Endpoint

Show the most important endpoint first.

Not the authentication endpoint. The "get started" endpoint.

3. Error Codes

What do errors mean?

Don't just list codes. Explain what happened and how to fix it.


The Format

OpenAPI Spec

Start with OpenAPI/Swagger.

Generate docs from code. Keeps docs in sync.

MDX for Guides

API reference is machine-generated. Guides are written.

Quickstart. Authentication. Common patterns.


The Checklist

  • Authentication explained with examples
  • Core endpoint documented with copy-paste code
  • Error codes explained
  • Rate limits documented
  • Quickstart guide
  • Authentication guide
  • Common use cases with examples
  • SDK if applicable

The Honest Take

Docs aren't optional.

Great docs = great adoption. Terrible docs = nobody integrates.

Invest in docs. Invest in adoption.

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