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API design

3 guides on api design. Practical writing from the team building Atlas, useful whether or not you buy anything.

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API design guides

  • July 3, 2026·11 min read·REST API, API design, sequence diagram, documentation

    How to Diagram a REST API

    A REST API looks simple as a list of endpoints and complicated the moment you draw the calls, auth, and errors together. Diagramming it exposes the design before clients depend on it.

  • July 3, 2026·10 min read·plantuml, sequence diagram, uml, api design

    PlantUML Sequence Diagrams: A Practical Tutorial

    Sequence diagrams are where PlantUML shines, because it lays them out itself rather than deferring to Graphviz. This tutorial takes you from a two-line diagram to loops, alternatives, and activation bars.

  • July 3, 2026·10 min read·sequence diagram, API design, software design, documentation

    Using Sequence Diagrams for API Design

    Sequence diagrams are the sharpest tool for designing an API, because they force you to think about the full conversation - including the failures - before you build it.

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