The fastest web-based bang redirector. Set https://bang.kobeerose.workers.dev/?q=%s as your default search engine to use DuckDuckGo-style bangs from any browser.
| DuckDuckGo | unduck | ReBang | |
|---|---|---|---|
| Redirect latency | 300-600ms | ~120ms | ~60ms |
| Approach | Server-side | Client-side JS | Edge worker |
| Bang sources | DDG only | DDG only | DDG + Kagi |
| Total bangs | 13,566 | 13,566 | 13,296 unique × 16,190 triggers |
| Custom bangs | No | No | Yes |
| Autocomplete | Yes | No | Yes |
unduck by Theo pioneered client-side bang redirects. ReBang takes it further by handling redirects at Cloudflare's edge network: the 302 redirect returns before any HTML or JavaScript loads. This fork serves the frontend from Cloudflare Pages and uses a separate Cloudflare Worker as the public entrypoint.
User: "cats !yt" ──► Cloudflare Edge ──► 302 redirect to YouTube
(nearest PoP) (~60ms globally)
For the top 1,297 bangs, a Cloudflare Worker returns a redirect immediately. No frontend HTML or JavaScript needs to load first. Rare bangs and custom bangs fall through to the Pages-hosted client app.
ReBang merges bangs from DuckDuckGo and Kagi, deduplicating by URL:
| Source | Count |
|---|---|
| DuckDuckGo | 13,566 |
| Kagi | 10,895 |
| Combined (raw) | 24,461 |
| After deduplication | 13,296 |
DDG stores each trigger as a separate entry (!g, !google, !goog = 3 entries). ReBang merges these into one bang with multiple triggers. Triggers aren't lost, they're consolidated.
- Custom bangs: Create personal shortcuts stored in localStorage
- Autocomplete: Type
!to search the full database - Configurable default: Set your preferred search engine for queries without a bang
- Monthly updates: GitHub Actions fetches fresh bangs from DDG and Kagi
Add as your default search engine:
Chrome: Settings → Search engine → Manage → Add
Firefox: Visit bang.kobeerose.workers.dev, click + in address bar
URL: https://bang.kobeerose.workers.dev/?q=%s
// Simplified from worker/src/index.ts
export default {
async fetch(request: Request): Promise<Response> {
const url = new URL(request.url);
const query = url.searchParams.get('q');
const bangMatch = query?.match(/!(\S+)/i);
if (!bangMatch) return passToOrigin(request, env);
const bang = triggerMap.get(bangMatch[1].toLowerCase());
if (!bang) return passToOrigin(request, env);
const cleanQuery = query.replace(/!\S+\s*/i, '').trim();
return Response.redirect(bang.u.replace(/%s/g, encodeURIComponent(cleanQuery)), 302);
},
};DuckDuckGo bang.js ──┐
├──► merge + dedupe ──► bangs.json
Kagi bangs.json ─────┘ │
├──► src/bangs-top.ts (client bundle)
├──► public/bangs.[hash].json (lazy-loaded full DB)
└──► worker/src/bangs.ts (edge worker)
pnpm install # Install frontend dependencies
pnpm run dev # Start frontend dev server
pnpm run update-bangs # Fetch + merge bangs from sources
pnpm run build # Production frontend build
cd worker
npm install --no-package-lock # Worker dependencies
npx wrangler dev # Local worker
npx wrangler deploy # Deploy worker to Cloudflare- Edge: Known bangs are resolved by a Cloudflare Worker and redirected without loading the frontend first.
- Client: Fallback UI and custom bang handling run in the browser via the Pages-hosted frontend.
- Settings: Stored in localStorage, never transmitted.
- unduck by Theo: Original client-side bang redirect
- Kagi Bangs: Open-source bang database
- DuckDuckGo: The original bang search
MIT