Val Town Static Server

A flexible, exportable static file server for Val Town that can serve HTML, JavaScript, CSS, and other text files from your project directory.

Features

🚀 Zero configuration - Works out of the box
📁 Dynamic file serving - No hardcoded file paths
🎯 Proper MIME types - Automatic content-type detection
🔧 Highly configurable - Custom options for advanced use cases
🛣️ API routes - Mix static files with dynamic endpoints
🔌 Middleware support - Add logging, auth, or custom processing
📱 SPA support - Built-in Single Page Application routing
❌ Smart 404 handling - Customizable error responses

Quick Start

Basic Setup

import { quickStaticServer } from "./static-server.ts";

// Serves index.html at root, any .js/.css/.html files by path
export default quickStaticServer();

Custom Index File

import { quickStaticServer } from "./static-server.ts";

export default quickStaticServer('/app.html');

Advanced Usage

Custom Configuration

import { createStaticServer } from "./static-server.ts";

const { handler } = createStaticServer({
  indexFile: '/index.html',
  headers: {
    'Cache-Control': 'no-cache',
    'X-Powered-By': 'My App'
  },
  mimeTypes: {
    '.ts': 'text/typescript; charset=utf-8'
  },
  notFoundHandler: (pathname) => {
    return new Response(`Custom 404: ${pathname} not found`, {
      status: 404,
      headers: { 'Content-Type': 'text/plain' }
    });
  }
});

export default handler;

API Routes + Static Files

import { advancedStaticServer } from "./static-server.ts";

export default advancedStaticServer({
  routes: {
    '/api/health': () => new Response('OK'),
    '/api/data': () => new Response(JSON.stringify({ 
      message: 'Hello from API!' 
    }), {
      headers: { 'Content-Type': 'application/json' }
    })
  },
  middleware: [
    async (req, next) => {
      console.log(`${req.method} ${new URL(req.url).pathname}`);
      return await next();
    }
  ]
});

Single Page Application (SPA)

import { createStaticServer } from "./static-server.ts";

const { handler, serveFile } = createStaticServer({
  importMetaUrl: import.meta.url,  // Required!
  notFoundHandler: async (pathname) => {
    // Serve index.html for routes without file extensions
    if (!pathname.includes('.')) {
      return await serveFile('/index.html', { importMetaUrl: import.meta.url });
    }
    return new Response('File not found', { status: 404 });
  }
});

export default handler;

Configuration Options

`StaticServerOptions`

Option	Type	Default	Description
`indexFile`	`string`	`'/index.html'`	File to serve at root path
`notFoundHandler`	`function`	Built-in 404	Custom 404 response handler
`errorHandler`	`function`	Built-in error	Custom error response handler
`mimeTypes`	`object`	Built-in types	Additional MIME type mappings
`headers`	`object`	`{}`	Headers added to all responses

Built-in MIME Types

.html → text/html; charset=utf-8
.js → application/javascript; charset=utf-8
.css → text/css; charset=utf-8
.json → application/json; charset=utf-8
.txt → text/plain; charset=utf-8
.md → text/markdown; charset=utf-8
.xml → application/xml; charset=utf-8
.svg → image/svg+xml; charset=utf-8

Project Structure

your-project/
├── index.html          # Main HTML file
├── script.js           # JavaScript files
├── style.css           # CSS files
├── static-server.ts    # The server module
├── server.ts           # Your HTTP val
└── api/
    └── data.json       # Static data files

Examples

See the /examples/ directory for complete working examples:

basic-server.ts - Minimal setup
custom-server.ts - Custom configuration
advanced-server.ts - API routes + middleware
spa-server.ts - Single Page Application

HTML Integration

Your HTML files can reference any JavaScript or CSS files:

<!DOCTYPE html>
<html>
<head>
    <link rel="stylesheet" href="/styles/main.css">
    <link rel="stylesheet" href="/components/header.css">
</head>
<body>
    <div id="app"></div>
    
    <!-- All these JS files will be served automatically -->
    <script src="/utils/helpers.js"></script>
    <script src="/components/header.js"></script>
    <script src="/app.js"></script>
</body>
</html>

Error Handling

The server provides helpful error messages:

404 for missing files: "JavaScript file not found: /missing.js"
500 for server errors: "Server error: [error message]"
Custom handlers: Override with your own error responses

Best Practices

File Organization: Keep related files in subdirectories
Error Handling: Provide custom 404 pages for better UX
Caching: Use appropriate cache headers for production
Security: Don't serve sensitive files (use proper file extensions)
Performance: Consider middleware for compression, logging, etc.

Migration from Basic Server

If you have an existing basic server, migration is simple:

// Before
export default async function(req: Request) {
  // manual file serving logic
}

// After
import { quickStaticServer } from "./static-server.ts";
export default quickStaticServer();

Contributing

This server module is designed to be:

Extensible - Easy to add new features
Maintainable - Clear separation of concerns
Reusable - Works across different Val Town projects

Feel free to extend it for your specific needs!