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Ajax: Overview

Ajax is a small wrapper around fetch which:

  • Allows globally registering request and response interceptors
  • Throws on 4xx and 5xx status codes
  • Supports caching, so a request can be prevented from reaching to network, by returning the cached response.
  • Supports JSON with ajax.fetchJSON by automatically serializing request body and deserializing response payload as JSON, and adding the correct Content-Type and Accept headers.
  • Adds accept-language header to requests based on application language
  • Adds XSRF header to request if the cookie is present


npm i --save @lion/ajax

Relation to fetch

Ajax delegates all requests to fetch. ajax.fetch and ajax.fetchJson have the same function signature as window.fetch, you can use any online resource to learn more about fetch. MDN is a great start.