Feature flags on Cloudflare Workers. 200¹ lines total.

npm install
wrangler deploy
wrangler secret put API_TOKEN

import { FeatureFlags } from "./client";

const flags = new FeatureFlags("https://your-worker.workers.dev");

if (flags.get("new-feature")) {
  // feature enabled
}

Visit worker URL. Enter token. Toggle flags.

GET /api/flags
GET /api/flags/:key
PUT /admin/flags/:key    # Bearer token required
DELETE /admin/flags/:key # Bearer token required

# wrangler.toml
name = "miniflags"
main = "worker.ts"

[[durable_objects.bindings]]
name = "FLAGS"
class_name = "FlagStore"

[[migrations]]
tag = "v1"
new_classes = ["FlagStore"]

• Durable Object stores flags
• WebSocket broadcasts changes
• Client caches locally
• No database required

Workers free tier covers 100K requests/day. Durable Objects free tier covers 1M requests/month.

MIT