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OpenCollection - An open specification for describing API collections

Talkat apidays India 2026 · 2026-08-19..08-20· [developer-experience, web-platform]
slides:none on file

OpenCollection is an open, YAML-based spec that Bruno uses as the single source of truth for API collections, claiming file-system-first YAML-based collection-as-code with Git diffs and extensions. Bruno shows it running at scale (4M users, 1M monthly, 46k GitHub stars, 200k weekly CLI installs) and demonstrates a working CLI, desktop client, generated docs and editor tooling where a login/register flow returns a token. The spec is open, extensible and designed for CLI, desktop client, docs and VS Code extension integration.

AI-written summary · about

  1. 0:00OpenCollection intro
  2. 1:54Bruno adoption
  3. 3:41Problem space
  4. 5:48OpenCollection vs Arazzo
  5. 7:13Vision for interfaces
  6. 7:34Demo in YAML
  7. 8:58CLI execution
  8. 11:06Bruno as editor
  9. 12:31Generating documentation from OpenCollection
  10. 14:25NestJS integration
  11. 19:10VS Code extension
  12. 20:33Source of truth
  13. 20:54Q&A
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