--- title: This API Client Is Amazing! (HTTP Interceptor, API... description: Requestly is an API development tool that helps developers intercept, mock, and modify HTTP requests during frontend development. It allows testing with... canonical: https://daily.dev/posts/this-api-client-is-amazing-http-interceptor-api-mocking-redirect-modify-response--m4al3f89p twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: This API Client Is Amazing! (HTTP Interceptor, API Mocking, Redirect, Modify Response) | daily.dev og:description: Requestly is an API development tool that helps developers intercept, mock, and modify HTTP requests during frontend development. It allows testing with... og:url: https://daily.dev/posts/this-api-client-is-amazing-http-interceptor-api-mocking-redirect-modify-response--m4al3f89p og:image: https://api.daily.dev/og/posts/M4AL3F89P.png og:image:alt: This API Client Is Amazing! (HTTP Interceptor, API Mocking, Redirect, Modify Response) og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # This API Client Is Amazing! (HTTP Interceptor, API Mocking, Redirect, Modify Response) **[ByteGrad](https://daily.dev/sources/bytegrad)** · 17 min read · 32 upvotes · 0 comments ## Summary Requestly is an API development tool that helps developers intercept, mock, and modify HTTP requests during frontend development. It allows testing with non-existent API endpoints, simulating different response states, modifying headers, adding delays, and redirecting requests. The tool works as both a Chrome extension and desktop application, enabling developers to experiment with UI components before backend APIs are ready, test error states, and debug network issues without modifying actual code. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#testing](https://daily.dev/tags/testing), [#frontend](https://daily.dev/tags/frontend) [View this post on daily.dev](https://daily.dev/posts/this-api-client-is-amazing-http-interceptor-api-mocking-redirect-modify-response--m4al3f89p) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"This API Client Is Amazing! 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