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Cloudflare Image Optimization
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Integration with frameworks

​​ Next.js

Image Resizing can be used automatically with the Next.js <Image /> component.

To use Image Resizing, define a global image loader or multiple custom loaders for each <Image /> component.

Next.js will request the image with the correct parameters for width and quality.

Image Resizing will be responsible for caching and serving an optimal format to the client.

​​ Global Loader

To use Image Resizing with all your app’s images, define a global loaderFile for your app.

Add the following settings to the next.config.js file located at the root our your Next.js application.


module.exports = {
images: {
loader: 'custom',
loaderFile: './imageLoader.js',
},
}

Next, create the imageLoader.js file in the specified path (relative to the root of your Next.js application).


const normalizeSrc = src => {
return src.startsWith('/') ? src.slice(1) : src;
};
export default function cloudflareLoader ({ src, width, quality }) {
const params = [`width=${width}`];
if (quality) {
params.push(`quality=${quality}`);
}
const paramsString = params.join(',');
return `/cdn-cgi/image/${paramsString}/${normalizeSrc(src)}`;
};

​​ Custom Loaders

Alternatively, define a loader for each <Image /> component.


import Image from 'next/image';
const normalizeSrc = src => {
return src.startsWith('/') ? src.slice(1) : src;
};
const cloudflareLoader = ({ src, width, quality }) => {
const params = [`width=${width}`];
if (quality) {
params.push(`quality=${quality}`);
}
const paramsString = params.join(',');
return `/cdn-cgi/image/${paramsString}/${normalizeSrc(src)}`;
};
const MyImage = props => {
return (
<Image
loader={cloudflareLoader}
src="/me.png"
alt="Picture of the author"
width={500}
height={500}
/>
);
};