Using the phrase 'so-called' implies that this is not really middleware. https://dictionary.cambridge.org/us/dictionary/english/so-called

Author: stritch-dev

src/content/3/en/part3a.md

@@ -950,7 +950,7 @@ POST is the only HTTP request type that is neither <i>safe</i> nor <i>idempotent
 
 ### Middleware
 
-The express [json-parser](https://expressjs.com/en/api.html) we took into use earlier is a so-called [middleware](http://expressjs.com/en/guide/using-middleware.html).
+The express [json-parser](https://expressjs.com/en/api.html) we took into use earlier is a [middleware](http://expressjs.com/en/guide/using-middleware.html).
 
 Middleware are functions that can be used for handling _request_ and _response_ objects.