--- description: Learn about the APIs used within Pages Functions. title: API reference image: https://developers.cloudflare.com/og-docs.png --- [Skip to content](#main-content) > Documentation Index > Fetch the complete documentation index at: https://developers.cloudflare.com/pages/llms.txt > Use this file to discover all available pages before exploring further. # API reference Last updated Aug 24, 2026|Copy as Markdown|[View as Markdown](https://9a51ac8b.previews.developers.cloudflare.com/pages/functions/api-reference/index.md)|[Agent setup](https://9a51ac8b.previews.developers.cloudflare.com/agent-setup/) The following methods can be used to configure your Pages Function. ## Methods ### `onRequests` The `onRequest` method will be called unless a more specific `onRequestVerb` method is exported. For example, if both `onRequest` and `onRequestGet` are exported, only `onRequestGet` will be called for `GET` requests. * `onRequest(context[EventContext](#eventcontext))` Response | Promise * This function will be invoked on all requests no matter what the request method is, as long as no specific request verb (like one of the methods below) is exported. * `onRequestGet(context[EventContext](#eventcontext))` Response | Promise * This function will be invoked on all `GET` requests. * `onRequestPost(context[EventContext](#eventcontext))` Response | Promise * This function will be invoked on all `POST` requests. * `onRequestPatch(context[EventContext](#eventcontext))` Response | Promise * This function will be invoked on all `PATCH` requests. * `onRequestPut(context[EventContext](#eventcontext))` Response | Promise * This function will be invoked on all `PUT` requests. * `onRequestDelete(context[EventContext](#eventcontext))` Response | Promise * This function will be invoked on all `DELETE` requests. * `onRequestHead(context[EventContext](#eventcontext))` Response | Promise * This function will be invoked on all `HEAD` requests. * `onRequestOptions(context[EventContext](#eventcontext))` Response | Promise * This function will be invoked on all `OPTIONS` requests. ### `env.ASSETS.fetch()` The `env.ASSETS.fetch()` function allows you to fetch a static asset from your Pages project. You can pass a [Request object](https://9a51ac8b.previews.developers.cloudflare.com/workers/runtime-apis/request/), URL string, or URL object to `env.ASSETS.fetch()` function. The URL must be to the pretty path, not directly to the asset. For example, if you had the path `/users/index.html`, you will request `/users/` instead of `/users/index.html`. This method call will run the header and redirect rules, modifying the response that is returned. ## Types ### `EventContext` The following are the properties on the `context` object which are passed through on the `onRequest` methods: * `request` [Request](https://9a51ac8b.previews.developers.cloudflare.com/workers/runtime-apis/request/) This is the incoming [Request](https://9a51ac8b.previews.developers.cloudflare.com/workers/runtime-apis/request/). * `functionPath` string This is the path of the request. * `waitUntil(promisePromise)` void Refer to [waitUntil documentation](https://9a51ac8b.previews.developers.cloudflare.com/workers/runtime-apis/context/#waituntil) for more information. * `passThroughOnException()` void Refer to [passThroughOnException documentation](https://9a51ac8b.previews.developers.cloudflare.com/workers/runtime-apis/context/#passthroughonexception) for more information. Note that this will not work on an [advanced mode project](https://9a51ac8b.previews.developers.cloudflare.com/pages/functions/advanced-mode/). * `next(input?Request | string, init?RequestInit)` Promise Passes the request through to the next Function or to the asset server if no other Function is available. * `env` [EnvWithFetch](#envwithfetch) * `params` Params

Holds the values from [dynamic routing](https://9a51ac8b.previews.developers.cloudflare.com/pages/functions/routing/#dynamic-routes). In the following example, you have a dynamic path that is `/users/[user].js`. When you visit the site on `/users/nevi` the `params` object would look like: ```js { user: "nevi"; } ``` This allows you fetch the dynamic value from the path: ```js export function onRequest(context) { return new Response(`Hello ${context.params.user}`); } ``` Which would return `"Hello nevi"`. * `data` Data ### `EnvWithFetch` Holds the environment variables, secrets, and bindings for a Function. This also holds the `ASSETS` binding which is how you can fallback to the asset-serving behavior. Was this helpful? YesNo ## On this page [![](https://9a51ac8b.previews.developers.cloudflare.com/_astro/logo.te5VL_aD.svg)Docs](https://9a51ac8b.previews.developers.cloudflare.com/) ```json {"@context":"https://schema.org","@type":"TechArticle","@id":"https://developers.cloudflare.com/pages/functions/api-reference/#page","headline":"API reference ยท Cloudflare Pages docs","description":"Learn about the APIs used within Pages Functions.","url":"https://developers.cloudflare.com/pages/functions/api-reference/","inLanguage":"en","image":"https://developers.cloudflare.com/og-docs.png","dateModified":"2026-08-24","publisher":{"@type":"Organization","name":"Cloudflare","description":"One platform for your apps, agents, and workforce. Build, secure, and scale without managing infrastructure","url":"https://www.cloudflare.com/","sameAs":["https://github.com/cloudflare","https://www.linkedin.com/company/cloudflare","https://x.com/cloudflare"],"logo":{"@type":"ImageObject","url":"https://developers.cloudflare.com/logo.svg"},"address":{"@type":"PostalAddress","streetAddress":"101 Townsend St","addressLocality":"San Francisco","addressRegion":"CA","postalCode":"94107","addressCountry":"US"},"contactPoint":[{"@type":"ContactPoint","contactType":"Customer Support","url":"https://support.cloudflare.com/","availableLanguage":["English"]},{"@type":"ContactPoint","contactType":"Sales","url":"https://www.cloudflare.com/contact/","availableLanguage":["English"]}]},"isPartOf":{"@type":"WebSite","@id":"https://developers.cloudflare.com/#website","name":"Cloudflare Docs","url":"https://developers.cloudflare.com/"}} ```