Designing APIs Developers Actually Love

Your API is a product, and developers are its users. Great APIs feel obvious; bad ones feel like a fight. Here are the design principles we follow to make integration a pleasure.

Be Predictable

• Consistent naming, casing, and structure across every endpoint
• Resources are nouns, actions are HTTP verbs
• Same error shape everywhere, with a machine-readable code and human message

Make Errors Helpful

A good error tells the developer exactly what went wrong and how to fix it:

• Use correct HTTP status codes
• Include a stable error code, a message, and a link to docs
• Never leak stack traces or internal details

Pagination, Filtering, Sorting

• Cursor-based pagination for large, changing datasets
• Consistent query parameters across collections
• Sensible defaults so the simple case stays simple

Versioning and Stability

• Version from day one — /v1
• Never break a published contract; add, don't change
• Announce deprecations early with clear timelines

Developer Experience

• Auto-generate docs from an OpenAPI spec so they never drift
• Provide copy-paste examples in multiple languages
• Ship a quickstart that gets to a successful call in under five minutes
• Reliable webhooks with retries, signatures, and an event log

Authentication

• Scoped API keys, easy to rotate
• Clear rate-limit headers so clients can back off gracefully

The Test

The best measure of an API: can a developer make their first successful call without reading the whole reference? If yes, you've designed it well.