compression-next

import express from 'express'; import compression from 'compression-next'; import { Z_BEST_COMPRESSION, constants } from 'zlib'; // Import zlib constants for options const app = express(); const port = 3000; // Apply compression middleware app.use(compression({ // For gzip/deflate, use 'level' option level: Z_BEST_COMPRESSION, // Example: apply best gzip/deflate compression // For brotli specific parameters, use 'params' // params: { // [constants.BROTLI_PARAM_MODE]: constants.BROTLI_MODE_TEXT, // [constants.BROTLI_PARAM_QUALITY]: constants.BROTLI_MAX_QUALITY // }, filter: (req, res) => { if (req.headers['x-no-compression']) { // Example: Do not compress responses with a specific header return false; } // Fallback to the default filter function (which uses 'compressible' module) return compression.filter(req, res); } })); // Route for a simple text response app.get('/', (req, res) => { res.send('Hello World! This response should be compressed.'); }); // Route for a larger JSON response to better demonstrate compression effect app.get('/data', (req, res) => { const largeData = Array(500).fill({ id: Math.random(), value: 'some repetitive text here for good compression effect and larger payload size to showcase middleware functionality.' }); res.json(largeData); }); app.listen(port, () => { console.log(`Server listening at http://localhost:${port}`); console.log('Test with curl -H "Accept-Encoding: gzip, deflate, br" http://localhost:3000/data'); console.log('And without: curl http://localhost:3000/data'); });