---
description: This tutorial builds a full-stack Pages application using the React framework.
title: Build an API for your front end using Pages Functions
image: https://developers.cloudflare.com/og-docs.png
---
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# Build an API for your front end using Pages Functions
Last updated Aug 24, 2026|Copy as Markdown|[View as Markdown](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/pages/tutorials/build-an-api-with-pages-functions/index.md)|[Agent setup](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/agent-setup/)
In this tutorial, you will build a full-stack Pages application. Your application will contain:
* A front end, built using Cloudflare Pages and the [React framework](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/pages/framework-guides/deploy-a-react-site/).
* A JSON API, built with [Pages Functions](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/pages/functions/get-started/), that returns blog posts that can be retrieved and rendered in your front end.
If you prefer to work with a headless CMS rather than an API to render your blog content, refer to the [headless CMS tutorial](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/pages/tutorials/build-a-blog-using-nuxt-and-sanity/).
## Video Tutorial
## 1\. Build your front end
To begin, create a new Pages application using the React framework.
### Create a new React project
In your terminal, create a new React project called `blog-frontend` using the `create-vite` command. Go into the newly created `blog-frontend` directory and start a local development server:
```sh
npx create-vite -t react blog-frontend
cd blog-frontend
npm install
npm run dev
```
### Set up your React project
To set up your React project:
1. Install the [React Router โ](https://reactrouter.com/en/main/start/tutorial) in the root of your `blog-frontend` directory.
npmyarnpnpmbun
```
npm i react-router-dom@6
```
```
yarn add react-router-dom@6
```
```
pnpm add react-router-dom@6
```
```
bun add react-router-dom@6
```
s
1. Clear the contents of `src/App.js`. Copy and paste the following code to import the React Router into `App.js`, and set up a new router with two routes:
```js
import { Routes, Route } from "react-router-dom";
import Posts from "./components/posts";
import Post from "./components/post";
function App() {
return (
} />
} />
);
}
export default App;
```
1. In the `src` directory, create a new folder called `components`.
2. In the `components` directory, create two files: `posts.js`, and `post.js`. These files will load the blog posts from your API, and render them.
3. Populate `posts.js` with the following code:
```js
import React, { useEffect, useState } from "react";
import { Link } from "react-router-dom";
const Posts = () => {
const [posts, setPosts] = useState([]);
useEffect(() => {
const getPosts = async () => {
const resp = await fetch("/api/posts");
const postsResp = await resp.json();
setPosts(postsResp);
};
getPosts();
}, []);
return (
Posts
{posts.map((post) => (
{post.title}
))}
);
};
export default Posts;
```
1. Populate `post.js` with the following code:
```js
import React, { useEffect, useState } from "react";
import { Link, useParams } from "react-router-dom";
const Post = () => {
const [post, setPost] = useState({});
const { id } = useParams();
useEffect(() => {
const getPost = async () => {
const resp = await fetch(`/api/post/${id}`);
const postResp = await resp.json();
setPost(postResp);
};
getPost();
}, [id]);
if (!Object.keys(post).length) return ;
return (
{post.title}
{post.text}
Published {new Date(post.published_at).toLocaleString()}
Go back
);
};
export default Post;
```
## 2\. Build your API
You will now create a Pages Functions that stores your blog content and retrieves it via a JSON API.
### Write your Pages Function
To create the Pages Function that will act as your JSON API:
1. Create a `functions` directory in your `blog-frontend` directory.
2. In `functions`, create a directory named `api`.
3. In `api`, create a `posts.js` file in the `api` directory.
4. Populate `posts.js` with the following code:
```js
import posts from "./post/data";
export function onRequestGet() {
return Response.json(posts);
}
```
This code gets blog data (from `data.js`, which you will make in step 8) and returns it as a JSON response from the path `/api/posts`.
1. In the `api` directory, create a directory named `post`.
2. In the `post` directory, create a `data.js` file.
3. Populate `data.js` with the following code. This is where your blog content, blog title, and other information about your blog lives.
```js
const posts = [
{
id: 1,
title: "My first blog post",
text: "Hello world! This is my first blog post on my new Cloudflare Workers + Pages blog.",
published_at: new Date("2020-10-23"),
},
{
id: 2,
title: "Updating my blog",
text: "It's my second blog post! I'm still writing and publishing using Cloudflare Workers + Pages :)",
published_at: new Date("2020-10-26"),
},
];
export default posts;
```
1. In the `post` directory, create an `[[id]].js` file.
2. Populate `[[id]].js` with the following code:
```js
import posts from "./data";
export function onRequestGet(context) {
const id = context.params.id;
if (!id) {
return new Response("Not found", { status: 404 });
}
const post = posts.find((post) => post.id === Number(id));
if (!post) {
return new Response("Not found", { status: 404 });
}
return Response.json(post);
}
```
`[[id]].js` is a [dynamic route](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/pages/functions/routing#dynamic-routes) which is used to accept a blog post `id`.
## 3\. Deploy
After you have configured your Pages application and Pages Function, deploy your project using the Wrangler or via the dashboard.
### Deploy with Wrangler
In your `blog-frontend` directory, run [wrangler pages deploy](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/workers/wrangler/commands/general/#deploy) to deploy your project to the Cloudflare dashboard.
```sh
wrangler pages deploy blog-frontend
```
### Deploy via the dashboard
To deploy via the Cloudflare dashboard, you will need to create a new Git repository for your Pages project and connect your Git repository to Cloudflare. This tutorial uses GitHub as its Git provider.
#### Create a new repository
Create a new GitHub repository by visiting [repo.new โ](https://repo.new). After creating a new repository, prepare and push your local application to GitHub by running the following commands in your terminal:
```sh
git init
git remote add origin https://github.com//
git add .
git commit -m "Initial commit"
git branch -M main
git push -u origin main
```
#### Deploy with Cloudflare Pages
Deploy your application to Pages:
1. In the Cloudflare dashboard, go to the **Workers & Pages** page.
[Go to **Workers & Pages** โ](https://dash.cloudflare.com/?to=/:account/workers-and-pages)
2. Select **Create application** \> **Pages** \> **Import an existing Git repository**.
3. Select the new GitHub repository that you created and, in the **Set up builds and deployments** section, provide the following information:
| Configuration option | Value |
| -------------------- | ------------- |
| Production branch | main |
| Build command | npm run build |
| Build directory | build |
After configuring your site, begin your first deploy. You should see Cloudflare Pages installing `blog-frontend`, your project dependencies, and building your site.
By completing this tutorial, you have created a full-stack Pages application.
## Related resources
* Learn about [Pages Functions routing](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/pages/functions/routing)
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