Upgrading to Fastify 3
summary
Upgrading Docs Render from Fastify 2 to Fastify 3 yields concrete outcomes: plugin signatures simplify (four lines collapse to one via the Fastify plugin async interface), the codebase becomes cleaner, and deployment is smooth with no console errors. The team runs the app in TypeScript, leans on the Fastify migration guide and test files to rewrite plugins, and relies on 70–80% test coverage plus Node TAP for confidence as most tests only need minor tweaks.
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chapters (13)
- 0:00Introduction
- 0:16Overview
- 1:08Backstory
- 2:45Understand the breaking changes
- 4:20Fix the foundation
- 6:17Plugin system
- 8:10Fastify test cases
- 9:44Fastify source code
- 11:50Typescript
- 13:42Test Coverage
- 16:52Migration Success
- 18:55Recommendations
- 21:54Outro
