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Router - Glossary | MDN 1/3 https://developer.mozilla.org/en-US/docs/Glossary/Router reference web, html, css, javascript, documentation 2026-05-05T05:43:10.829634+00:00 kb-cron

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  1. Glossary
  2. Router

Router

On the web, the term router can refer to different concepts depending on the context:

  • For the network layer, a router is a networking device that decides where to direct data packets.
  • For a single-page application (SPA) in the application layer, a router is a library that decides what web page is presented by a given URL. This middleware module is used for all URL functions, as these are given a path to a file that is rendered to open the next page. The concept of routing in SPAs has evolved significantly over the years. See the hash routing glossary entry to learn more.
  • In the implementation of an API in a service layer, a router is a software component that parses a request and directs or routes the request to various handlers within a program. The router code usually accepts a response from the handler and facilitates its return to the requester.

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