gr8hopper

Lightweight, performance-first URL redirect service with an admin UI. Deploy to Cloudflare Workers (edge) or any VPS (Node.js/Bun/Docker).

Looking for detailed guides? Check out the Full Wiki Documentation.

Why gr8hopper?

gr8hopper is built to handle complex, parameter-driven routing logic that standard redirectors or marketing platforms often find cumbersome to manage.

It simplifies scenarios where you need to route traffic to many different domains or destinations based on dynamic parameters, keeping your source data (like contact lists or CRM records) clean and your redirect logic centralized.

While built for these advanced scenarios, gr8hopper is also an excellent general-purpose redirector due to its minimal footprint, simple UI, and blazing fast edge performance.

Example: You have a central link service (links.yourapp.com) and want to route users to different customer portals (customer1.com, customer2.com, etc.) or specific product paths. Instead of managing thousands of unique links in your CRM, you send one template: links.yourapp.com?r=portal&c=123. gr8hopper dynamically rewrites this to the correct destination.

Use it if:

You need flexible, parameter-driven routing (e.g., query params → path segments).
You want to centralize multi-domain redirection logic outside of your primary platform.
You want a tiny, self-hosted redirector without the bloat of other tools.
You want edge deployment (Cloudflare Workers) or lightweight self-hosting (Docker).

Don't use it if:

You just want a basic URL shortener with click tracking (try Shlink or YOURLS).
You need full SaaS analytics (try Bitly or Rebrandly).

Features

Admin UI for managing routes
Parameter rewriting (query → path, {params} substitution)
Edge Efficiency (Aggressive 301 caching)
Standalone deployment (Self-contained logic)
Minimal Footprint (Built on Hono: zero-dependency, ultra-lightweight web framework)

gr8hopper vs other redirect tools

Tool	Multi-domain param routing	Edge (Workers)	Admin UI	Size/Deps
gr8hopper	✅ Core feature	✅ Workers/Docker	✅ Simple	Tiny (Minimal)
Shlink	❌ Basic shortener	❌	✅ Full	Heavy
re:Director	❌	❌	✅	Medium
RedirHub	❌ SaaS only	N/A	✅	N/A
urllo	❌ Paid SaaS	N/A	✅ Advanced	N/A

🚀 Quick Start

Docker (easiest)

docker run -d --restart unless-stopped \
  -p 3000:3000 \
  -e ADMIN_USERNAME=your-username \
  -e ADMIN_PASSWORD=your-secure-password \
  -v gr8hopper-data:/app/data \
  --name gr8hopper \
  ghcr.io/dima6312/gr8hopper:latest

Cloudflare Workers (zero-cost production)

See Cloudflare Workers

How It Works

Redirect Flow

Request: /?r=partner-a&id=12345
                    │
                    ▼
         ┌──────────────────┐
         │  Edge Cache Hit? │
         └────────┬─────────┘
                  │
     ┌────────────┴────────────┐
     │                         │
     ▼ YES                     ▼ NO
┌─────────┐            ┌──────────────┐
│ Return  │            │ Look up      │
│ cached  │            │ route config │
│ 301     │            └──────┬───────┘
│ (<1ms)  │                   │
└─────────┘                   ▼
                      ┌──────────────┐
                      │ Substitute   │
                      │ {params}     │
                      └──────┬───────┘
                             │
                             ▼
                      ┌──────────────┐
                      │ Return 301   │
                      │ + cache it   │
                      └──────────────┘

Example

Route Configuration:

{
  "id": "partner-a",
  "template": "https://partner-a.com/product/{id}?ref={route}",
  "active": true
}

Request:

https://your-domain.com/?r=partner-a&id=12345

Result:

301 Redirect → https://partner-a.com/product/12345?ref=partner-a

Note: The {route} placeholder is automatically replaced with the route ID (URL-encoded), useful for tracking which route was used safely in query strings.

Configuration

Route Schema

Field	Type	Required	Description
`template`	string	Yes	Target URL with `{param}` placeholders
`active`	boolean	Yes	Enable/disable this route
`passthrough`	boolean	No	Pass through query parameters from source URL (default: false)

Template Placeholders

Use {param} syntax in your destination URL template:

Placeholder	Source	Example
`{route}`	Route ID (automatic, URL-encoded)	`partner-a`
`{anyParam}`	URL query parameter	`?anyParam=value`

Missing placeholders are left as-is (e.g., {id} stays {id}) to make configuration errors visible in the destination URL.

Example template: https://site.com/{route}/product/{id}

Pattern Routes

Route IDs can be patterns. Supported tokens:

{param} required path param, {param?} optional, {param=default} optional with default
:param shorthand for path params (required)
* wildcard for exactly one path segment
** globstar for zero or more path segments (consumes rest)
Query patterns like ?lang={lang}, ?lang={lang?}, ?lang=en, and ?* are supported

Pattern Examples:

shop/:category/:id matches /shop/shoes/42
blog/{year?}/{slug} matches /blog/2024/launch and /blog/launch
files/** matches /files, /files/a, and /files/a/b/c
*/details/* matches /shoes/details/42 (each * captures exactly one segment)
product/{id}?lang={lang?} matches /product/123 and /product/123?lang=en

Multiple Wildcards: If a pattern contains multiple wildcards of the same type, they are indexed:

First * → *, second * → *1, third * → *2
First ** → **, second ** → **1, third ** → **2

Example:

Pattern: */category/*/item
Path: /shop/category/shoes/item
Captured: { '*': 'shop', '*1': 'shoes' }
Template: https://example.com/{*}/{*1} → https://example.com/shop/shoes

Tip: If you need to combine an optional path parameter with query parameters, use the {param?} syntax to avoid ambiguity.

✅ shop/{id?}?sort={sort}: Optional id AND optional sort query param.
⚠️ shop/:id?sort={sort}: The ? acts as a query separator, so :id becomes required.

Case Sensitivity:

Path matching is case-insensitive. A route defined as Shop/{id} will match /shop/123, /SHOP/123, and /Shop/123.
Captured parameters preserve their original casing (e.g., if the user visits /Shop/RedShoes, the {id} parameter will be RedShoes).
Query parameter names are case-sensitive. A pattern ?source={source} matches ?source=google but NOT ?Source=google or ?SOURCE=google.
Query parameter values preserve original case.

Reserved Placeholders:

{route} is a reserved placeholder that auto-populates with the route ID (URL-encoded). User-defined parameters named route will be overwritten.

Reserved paths: /favicon.ico is reserved for browser requests. Route IDs like favicon can be used safely via query-parameter routing (e.g., /?r=favicon).

Query Parameter Passthrough

When passthrough is enabled, query parameters from the source URL (like UTM tags, tracking parameters, etc.) are automatically appended to the destination URL. This is useful for preserving marketing campaign data and analytics during redirects.

Behavior:

Destination template params take precedence; source params are appended only if the key is not already present
The route_param (e.g., r) and reserved {route} placeholder are excluded from passthrough
For pattern routes: params declared in the pattern are excluded (e.g., lang in product/{id}?lang={lang})
Passthrough is opt-in (off by default)

Examples:

Simple route with passthrough:

Route: shop (passthrough: true)
Source: /shop?utm_source=email&ref=partner
Destination: https://example.com/shop
Result: https://example.com/shop?utm_source=email&ref=partner

Pattern route with passthrough:

Route: product/{id}?lang={lang} (passthrough: true)
Source: /product/123?lang=en&utm_source=email&ref=partner
Destination: https://example.com/product/{id}?lang={lang}
Excluded: id, lang, route (pattern params + reserved)
Result: https://example.com/product/123?lang=en&utm_source=email&ref=partner

Global Settings

Field	Type	Default	Description
`fallback_url`	string	`/not-found`	Redirect when no route param or route not found (must be absolute URL like `https://...` to redirect)
`cache_ttl`	number	`604800`	Cache duration in seconds (1 week)
`route_param`	string	`r`	URL parameter name for route selection

URL Parameter Name

By default, Gr8hopper uses r as the URL parameter for route selection:

https://your-domain.com/?r=my-route&id=123

You can customize this in the admin settings. For example, setting it to route:

https://your-domain.com/?route=my-route&id=123

Environment Variables

Variable	Default	Platform	Description
`PORT`	`3000`	VPS	HTTP server port
`CONFIG_FILE`	`./routes.json`	VPS	Path to routes config file
`ADMIN_USERNAME`	(required)	Both	Admin panel username
`ADMIN_PASSWORD`	(required)	Both	Admin panel password
`ADMIN_PATH`	`admin`	Both	Admin URL path (customize to hide admin)

Admin Panel

Access the admin interface at /admin (requires authentication).

The admin panel features:

Routes management: Add, edit, and delete redirect routes
Visual status: Toggle routes on/off with a simple switch or one-click toggle in the list
Mobile Optimized: Responsive design for managing redirects on the go
Settings: Configure fallback URL, cache duration, and URL parameter name
Import/Export: Backup and restore routes as JSON files (replaces all routes on import)

API Endpoints

Method	Endpoint	Description
`GET`	`/admin/routes`	List all routes
`GET`	`/admin/routes/:id`	Get single route
`POST`	`/admin/routes`	Create new route
`PUT`	`/admin/routes/:id`	Update existing route
`DELETE`	`/admin/routes/:id`	Delete route
`GET`	`/admin/settings`	Get global settings
`PUT`	`/admin/settings`	Update global settings
`GET`	`/admin/export`	Export all routes and settings as JSON
`POST`	`/admin/import`	Import routes and settings (replaces all)

API Example

# Create a route
curl -X POST https://your-domain.com/admin/routes \
  -u admin:password \
  -H "Content-Type: application/json" \
  -d '{
    "id": "my-route",
    "template": "https://example.com/{id}",
    "active": true
  }'

Performance

Caching Strategy

Gr8hopper uses aggressive caching to minimize compute costs:

First request per unique URL: Worker executes, reads config, returns 301 with cache headers
All subsequent requests: Served directly from edge cache (no code execution)

Cache Headers:

Cache-Control: public, max-age=604800, s-maxage=604800
CDN-Cache-Control: max-age=4233600

Note: The CDN-Cache-Control header uses a 7x multiplier on the configured TTL, so CDN edge servers cache redirects 7 times longer than browsers (e.g., 1 week browser cache = 7 weeks edge cache).

Cache Invalidation

CDN Cache (Cloudflare): If you need to update a redirect destination mid-campaign, purge the CDN cache:

Option 1: Built-in Admin Button (Recommended)

Configure cache purge credentials (see below)
Use the "Purge All" button in Settings

Option 2: Cloudflare Dashboard

Go to Cloudflare Dashboard → your domain → Caching → Configuration
Click Purge Everything

To enable the built-in purge button:

npx wrangler secret put CLOUDFLARE_API_TOKEN  # Token with Zone.Cache Purge permission
npx wrangler secret put CLOUDFLARE_ZONE_ID    # Your zone ID from CF dashboard

Browser Cache: Once a user's browser caches a 301 redirect, it cannot be remotely invalidated. The browser will use the cached redirect until:

The cache TTL expires (default: 1 week)
The user manually clears their browser cache

Best practice: Finalize your redirect destinations before launching campaigns. If you anticipate needing to change destinations frequently, consider using a shorter cache TTL in settings.

Capacity Example

For an email campaign with:

250 routes × 50 IDs per email = 12,500 unique URLs
1,000,000 recipients
~4 security bot scans per recipient

Result:

Total requests: ~200,000,000
Actual Worker invocations: ~12,500 (one per unique URL)
Cache hit rate: 99.99%
Cost: Cloudflare free tier handles this easily

Project Structure

gr8hopper/
├── src/
│   ├── index.ts              # Cloudflare Workers entry
│   ├── server.ts             # Node.js/Bun entry
│   ├── types.ts              # TypeScript interfaces
│   ├── admin-html.ts         # Admin UI (embedded)
│   ├── handlers/
│   │   ├── redirect.ts       # Redirect logic + template engine
│   │   └── admin.ts          # Admin API endpoints
│   ├── storage/
│   │   ├── adapter.ts        # Storage interface
│   │   ├── kv.ts             # Cloudflare KV adapter
│   │   └── json-file.ts      # JSON file adapter
│   ├── middleware/
│   │   └── auth.ts           # Basic auth
│   └── utils/
│       ├── sanitize.ts       # Route ID sanitization
│       └── validation.ts     # URL and config validation
├── wrangler.toml.example     # Cloudflare config template (copy to wrangler.toml)
├── wrangler.production.toml.example  # Production config template
├── routes.json               # Local routes (VPS mode)
├── package.json
└── tsconfig.json

Development

# Install dependencies
npm install

# Cloudflare Workers local dev
npm run dev

# Node.js local dev (hot reload)
npm run dev:node

# Type checking
npx tsc --noEmit

# Build for production
npm run build

Data Storage

Cloudflare Workers

Routes and settings are stored in Cloudflare KV - a globally distributed key-value store. Data persists across deployments and is replicated worldwide.

VPS (Node.js/Bun)

Routes and settings are stored in a local JSON file (routes.json by default).

Data persists across server restarts
Back up this file regularly
Change location with CONFIG_FILE environment variable

Bulk Import Routes

Import routes directly to Cloudflare KV without using the admin UI. This is useful for:

Initial deployment with pre-configured routes
CI/CD pipelines
Migrating from another system

Usage

# Import routes.json to production KV
npm run import:routes routes.json

# Import to local dev KV
npm run import:routes routes.json --local

# Import from custom path
npm run import:routes /path/to/my-routes.json

File Format

{
  "routes": {
    "my-route": {
      "template": "https://example.com/product/{id}",
      "active": true,
      "passthrough": true
    },
    "another-route": {
      "template": "https://partner.com/{category}/{id}?ref={route}",
      "active": true
    }
  },
  "settings": {
    "fallback_url": "https://example.com/not-found",
    "cache_ttl": 604800,
    "route_param": "r"
  }
}

Field	Required	Description
`routes`	Yes	Object of route ID → config
`routes.*.template`	Yes	Target URL with `{placeholders}`
`routes.*.active`	Yes	Enable/disable route
`routes.*.passthrough`	No	Pass through query parameters (default: false)
`settings`	No	Global settings (uses defaults if omitted)

Note: The script reads KV namespace ID from wrangler.production.toml or wrangler.toml.

Deployment

Cloudflare Workers (Recommended for production)

Create a KV namespace:

npx wrangler kv namespace create ROUTES_KV

Copy the example production config and add your KV namespace ID:
```
cp wrangler.production.toml.example wrangler.production.toml
# Edit wrangler.production.toml and replace "your-production-kv-namespace-id" with your actual ID
```
Note: wrangler.production.toml is gitignored to keep your namespace ID private. The example file (wrangler.production.toml.example) serves as a template.

Set admin credentials:

npx wrangler secret put ADMIN_USERNAME
npx wrangler secret put ADMIN_PASSWORD

(Optional) Pre-configure routes:

# Import routes from a JSON file (skips UI setup)
npm run import:routes routes.json

See Bulk Import Routes for file format.

Deploy:
```
npm run deploy
```
(Optional) Add custom domain:
- Go to Cloudflare Dashboard → Workers & Pages → gr8hopper
- Settings → Triggers → Custom Domains
- Add your domain (e.g., go.yourdomain.com)

Docker (VPS)

FROM node:20-alpine AS builder
WORKDIR /app
COPY package*.json ./
RUN npm ci
COPY . .
RUN npm run build

FROM node:20-alpine AS runner

WORKDIR /app

COPY package*.json ./
RUN npm ci --omit=dev --ignore-scripts

COPY --from=builder /app/dist ./dist

# Create a non-root user and data directory
RUN addgroup -g 1001 -S nodejs && \
    adduser -S gr8hopper -u 1001 -G nodejs && \
    mkdir -p /app/data && \
    chown gr8hopper:nodejs /app/data

USER gr8hopper

# Set default environment variables
ENV NODE_ENV=production
ENV PORT=3000
ENV CONFIG_FILE=/app/data/routes.json

EXPOSE 3000
CMD ["node", "dist/server.js"]

Docker Compose (Recommended)

Create a docker-compose.yml in your root:

services:
  gr8hopper:
    build:
      context: .
      dockerfile: examples/Dockerfile
    container_name: gr8hopper
    ports:
      - "3000:3000"
    environment:
      # Required - will fail if not provided via .env file or shell
      - ADMIN_USERNAME=${ADMIN_USERNAME:?ADMIN_USERNAME is required}
      - ADMIN_PASSWORD=${ADMIN_PASSWORD:?ADMIN_PASSWORD is required}
      # Optional settings
      - ADMIN_PATH=${ADMIN_PATH:-admin}
      - CONFIG_FILE=/app/data/routes.json
      - PORT=3000
    volumes:
      # Use named volume to avoid permission issues with non-root user
      - gr8hopper-data:/app/data
    restart: unless-stopped
    healthcheck:
      # Check "/" instead of "/health" since /health was removed to avoid shadowing user routes
      test: [ "CMD", "node", "-e", "fetch('http://localhost:3000/').then(r => process.exit(r.status >= 500 ? 1 : 0)).catch(() => process.exit(1))" ]
      interval: 30s
      timeout: 10s
      retries: 3

volumes:
  gr8hopper-data:

Note: Create a .env file with ADMIN_USERNAME and ADMIN_PASSWORD before running docker compose up. The compose file will fail if these are not set, preventing accidental deployment without credentials.

Systemd (VPS)

Create an environment file at /etc/gr8hopper/.env:

# /etc/gr8hopper/.env
ADMIN_USERNAME=your-username
ADMIN_PASSWORD=your-secure-password
ADMIN_PATH=admin

Then create the systemd service:

[Unit]
Description=Gr8hopper
After=network.target

[Service]
Type=simple
User=www-data
WorkingDirectory=/opt/gr8hopper
ExecStart=/usr/bin/node dist/server.js
EnvironmentFile=/etc/gr8hopper/.env
Environment=PORT=3000
Restart=on-failure

[Install]
WantedBy=multi-user.target

Setup:

# Create environment file directory
sudo mkdir -p /etc/gr8hopper
sudo nano /etc/gr8hopper/.env
# Add your credentials, then save

# Secure the environment file
sudo chmod 600 /etc/gr8hopper/.env
sudo chown www-data:www-data /etc/gr8hopper/.env

# Enable and start the service
sudo systemctl enable gr8hopper
sudo systemctl start gr8hopper

Nginx Reverse Proxy (VPS)

For HTTPS and custom domain on VPS, use Nginx as a reverse proxy:

server {
    listen 443 ssl http2;
    server_name go.yourdomain.com;

    ssl_certificate /etc/letsencrypt/live/go.yourdomain.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/go.yourdomain.com/privkey.pem;

    location / {
        proxy_pass http://127.0.0.1:3000;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }
}

server {
    listen 80;
    server_name go.yourdomain.com;
    return 301 https://$server_name$request_uri;
}

NPM Package (Global Install)

# Install globally
npm install -g gr8hopper

# Set environment variables
export ADMIN_USERNAME=your-username
export ADMIN_PASSWORD=your-secure-password

# Run the server
npx gr8hopper

Node.js (Source)

# Clone and install
git clone https://github.com/dima6312/gr8hopper.git
cd gr8hopper
npm install

# Configure environment
export ADMIN_USERNAME=your-username
export ADMIN_PASSWORD=your-secure-password
export PORT=3000

# Production
npm run build
npm start

Bun

bun install
ADMIN_USERNAME=your-username ADMIN_PASSWORD=your-password bun run src/server.ts

Upgrading

From versions before 1.4.0

Sanitizer behavior change: Route IDs now support pattern characters (/, {, }, *, ., :, ?, &, =). Previously, these characters were stripped (e.g., shop.items became shopitems). After upgrading:

Existing simple routes continue to work unchanged
If you had routes with stripped characters, verify they still resolve correctly
Pattern routes (e.g., shop/{id}) are now fully supported

Backslash sanitization: Route IDs containing backslashes (\) are stripped for security hardening. If you have routes like legacy\path, they will become legacypath after upgrade.

Health endpoint removed: The /health path no longer shadows user routes. If you relied on /health for health checks, use your platform's native health check (Cloudflare Workers provide this automatically) or add a dedicated route.

Important

Query Parameter Passthrough precedence inverted: For routes with passthrough: true, destination template params now take precedence over source params. Source params are appended only if the key is not already present in the template. Audit your passthrough: true routes if you relied on source params overriding template values.

Security

Admin endpoints require HTTP Basic Authentication
All traffic should use HTTPS (Cloudflare enforces this; for VPS, use a reverse proxy)
Route IDs are sanitized to lowercase and allow pattern characters (/, {, }, *, ., :, ?, &, =, -)
Destination URLs enforced to use HTTPS
Template URLs validated to block dangerous schemes (javascript:, data:, etc.)
No user data is stored; the service is stateless
XSS protection: All dynamic content uses safe DOM methods

See SECURITY.md for detailed security considerations and vulnerability reporting.

Rate Limiting

Rate limiting is recommended for production deployments to prevent brute-force attacks on the admin panel.

Cloudflare Workers:

Use Cloudflare's built-in rate limiting (more efficient than application-level):

Go to Cloudflare Dashboard → Security → WAF → Rate limiting rules
Create a rule for your admin path:
- If: URI Path contains /admin
- Then: Block for 1 minute when rate exceeds 10 requests per minute per IP

VPS (Nginx):

Add rate limiting to your Nginx configuration:

# Define rate limit zone (10 requests/minute for admin)
limit_req_zone $binary_remote_addr zone=admin:10m rate=10r/m;

server {
    # ... existing config ...

    location /admin {
        limit_req zone=admin burst=5 nodelay;
        proxy_pass http://127.0.0.1:3000;
        # ... other proxy settings ...
    }
}

Good to Know

Why no click tracking/analytics?

gr8hopper is designed to be a high-performance router, not a marketing analytics platform. By not storing every click in a database, we achieve:

Sub-ms performance: CDN-cached redirects never hit our code.
Zero Maintenance: No database to scale or clean up.
Data Privacy: We don't track user IPs or behavior.

Tip: Use UTM parameters in your destination templates to track attribution in Google Analytics, Plausible, or your internal tools.

Propagation & Caching

KV Consistency: When using Cloudflare Workers, changes in the Admin UI may take up to 60 seconds to propagate globally across all edge locations.
Browser Caching: By default, gr8hopper sends 301 Moved Permanently. Browsers cache these aggressively. For testing, use Incognito mode or a tool like curl.
Fallback Caching: Unmatched routes (fallback redirects) are cached for a maximum of 30 minutes, even if your cache_ttl is longer. This allows newly created routes to take effect without waiting for the full cache expiry.

Concurrent Admin Edits

When using Cloudflare Workers, if two admins update pattern routes simultaneously, one update may be lost. This is a known limitation of KV's eventual consistency model. For high-traffic admin scenarios, consider serializing edits or using the import/export feature for batch updates.

License

MIT License - see LICENSE for details.

Name		Name	Last commit message	Last commit date
Latest commit History 12 Commits
.github/workflows		.github/workflows
.husky		.husky
docs		docs
examples		examples
scripts		scripts
src		src
test		test
wiki		wiki
.dev.vars.example		.dev.vars.example
.dockerignore		.dockerignore
.gitignore		.gitignore
.npmignore		.npmignore
CONTRIBUTING.md		CONTRIBUTING.md
LICENSE		LICENSE
README.md		README.md
SECURITY.md		SECURITY.md
eslint.config.js		eslint.config.js
package-lock.json		package-lock.json
package.json		package.json
tsconfig.json		tsconfig.json
wrangler.production.toml.example		wrangler.production.toml.example
wrangler.toml.example		wrangler.toml.example

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gr8hopper

Why gr8hopper?

Features

gr8hopper vs other redirect tools

🚀 Quick Start

Docker (easiest)

Cloudflare Workers (zero-cost production)

How It Works

Redirect Flow

Example

Configuration

Route Schema

Template Placeholders

Pattern Routes

Query Parameter Passthrough

Global Settings

URL Parameter Name

Environment Variables

Admin Panel

API Endpoints

API Example

Performance

Caching Strategy

Cache Invalidation

Capacity Example

Project Structure

Development

Data Storage

Cloudflare Workers

VPS (Node.js/Bun)

Bulk Import Routes

Usage

File Format

Deployment

Cloudflare Workers (Recommended for production)

Docker (VPS)

Docker Compose (Recommended)

Systemd (VPS)

Nginx Reverse Proxy (VPS)

NPM Package (Global Install)

Node.js (Source)

Bun

Upgrading

From versions before 1.4.0

Security

Rate Limiting

Good to Know

Why no click tracking/analytics?

Propagation & Caching

Concurrent Admin Edits

License

About

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Resources

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