2 posts tagged with "migration"

One of the most underrated improvements in the v3 router is not a new method or fancy syntax. It is handler compatibility.

In plain terms: Fiber can now accept multiple handler styles directly, and the router compatibility layer adapts them for you. That sounds small until you are migrating a real codebase with hundreds of handlers, middleware functions, and utility packages in different styles. Then it becomes the feature that decides whether migration happens this quarter or gets postponed again.

When most teams read a "what's new" post, they are usually looking for one of two things.

The first is curiosity: what did the framework ship? The second is risk management: what do we need to change first, and what can wait until later?

For Fiber v3, the second question is the important one.

The release includes a lot of meaningful work, but a few parts have outsized impact in real services: request binding, lifecycle hooks, listen configuration, handler compatibility, context improvements, and the new extractors package.

This article is intentionally written for that reality. You should be able to read this, open one service in your codebase, and know exactly what to migrate first and why.