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docs: add router debug log change to v5 migration guide #1819

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docs: add router debug log change to v5 migration guide #1819

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20 changes: 20 additions & 0 deletions en/guide/migrating-5.md
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,7 @@ You can then run your automated tests to see what fails, and fix problems accord
<li><a href="#res.send.status">res.send(status)</a></li>
<li><a href="#res.sendfile">res.sendfile()</a></li>
<li><a href="#express.static.mime">express.static.mime</a></li>
<li><a href="#express:router-debug-logs">express:router debug logs</a></li>
</ul>

**Changed**
Expand Down Expand Up @@ -277,6 +278,25 @@ const mime = require('mime-types')
mime.lookup('json')
```

<h4 id="express:router-debug-logs">express:router debug logs</h4>

In Express 5, router handling logic is performed by a dependency. Therefore, the
debug logs for this behavior are no longer available under the `express:` namespace.
In v4, the logs were available under the namespaces `express:router`, `express:router:layer`,
and `express:router:route`. All of these were included under the namespace `express:*`.
In v5, the logs are available under the namespaces `router`, `router:layer`, and `router:route`.
The logs from `router:layer` and `router:route` are included in the namespace `router:*`.
To achieve the same detail of debug logging when using `express:*` in v4, use a conjunction of
`express:*`, `router`, and `router:*`.

```sh
# v4
DEBUG=express:* node index.js

# v5
DEBUG=express:*,router,router:* node index.js
```

<h3>Changed</h3>

<h4 id="path-syntax">Path route matching syntax</h4>
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