Application example Bindings

Use Images in a real application path

Images bindings let Workers transform, resize, and encode images without public image URLs.

A compact Images recipe with config and worker usage in one application path.

Use this as the copyable starter before threading the feature into a larger application.

Config focus: bindings.images
Runtime shape
Best use: image transformation/upload paths where the Worker calls the Images binding

Start by wiring the binding clearly in config

Smallest Images config

import { defineConfig } from 'devflare/config'

export default defineConfig({

name: 'images-worker',

bindings: {

images: {

IMAGES: true

}

})

Build the application flow around the binding

Treat this as the app-level Images path: the route, event handler, or service module receives a real request and uses the binding to do useful work.

Keep product limits, remote ownership, and fallback behavior visible in the code around the binding instead of hiding everything behind a vague utility too early.

Keep the first example short enough to paste into a new Worker.
Cloudflare owns hosted image storage, variants, delivery rules, billing, and final transform fidelity.

Transform uploaded image bytes

import { env } from 'devflare/runtime'

export async function fetch(request: Request): Promise<Response> {

if (!request.body) {

return new Response('missing image', { status: 400 })

}

return env.IMAGES

.input(request.body)

.transform({ width: 320 })

.output({ format: 'image/jpeg' })

}

Keep production boundaries visible

Config focus: bindings.images.
Runtime shape: .
Best use: image transformation/upload paths where the Worker calls the Images binding.

Thread this into the next recipe

Once this smallest path works, add routing, generated types, and feature-specific abstraction in that order.

Testing Images

Test Images by choosing the local harness that matches the product boundary instead of reaching for Cloudflare by default.

Media Transformations

Add the Media Transformations config, call from worker code, and start with the local test path Devflare supports.