APIs for Product Managers
Writing API Documentation Developers Actually Use
Documentation is not a deliverable engineering owes you at the end. It is a product surface with its own DX, and it is frequently the actual reason an integration succeeds or fails.
Great API docs share a structure. Steal it.
Section | Purpose | The mistake to avoid |
|---|---|---|
Quickstart | Get a developer to one successful call, fast | Burying the working example under conceptual explanation they don't need yet |
Authentication guide | How to get and use credentials | Assuming they already understand OAuth |
Endpoint reference | Every endpoint, every parameter, every response case | Auto-generated docs with no prose explaining why, only what |
Guides / how-tos | Task-oriented walkthroughs ("How to handle a failed payment") | Only reference docs, no task-oriented narrative at all |
Changelog | Every change, dated, with migration notes for breaking ones | A changelog nobody reads because breaking changes look identical to trivial ones |
Error reference | Every error code, what causes it, how to fix it | Errors documented as an afterthought, or not at all |
The highest-leverage single artifact in this list, and the one PMs are best positioned to write or review, is the quickstart. Engineers writing reference docs will, correctly, aim for completeness. A quickstart needs the opposite instinct: ruthless minimalism, aimed at getting someone to a working "hello world" moment before they lose patience, with everything else deferred to later pages.
YOUR MOVE THIS WEEK
Read your own product's quickstart guide start to finish, timing yourself, pretending you know nothing. Count how many times you'd have to leave the page to look something up. Every one of those is a drop-off point you can fix this quarter.