Minificateur JavaScript - Compression de Code

Retour aux Outils
Minifiez le code JavaScript pour réduire la taille du fichier pour le déploiement en production. Supprime les commentaires, les espaces et raccourcit les noms de variables. Peut réduire les fichiers JS de 30-70% en améliorant les temps de chargement des pages.
Professional JavaScript Minifier & Code Optimizer

Advanced JavaScript minification tool for frontend developers and DevOps engineers. Reduce JS bundle sizes by up to 85%.

Advanced AST-based minification Variable name mangling and optimization ES6+/ES2020+ syntax support Tree shaking and unused code removal Source map generation for debugging production code Batch processing for multiple files and entire projects
Practical Examples
React Component Optimization

Reduce React bundle size by 70%

BEFORE (Original JavaScript) 
const App = () => { return <div>Hello</div>; };
AFTER (Minified JavaScript) 
const a=()=>React.createElement("div",null,"Hello");
Express.js API Route Compression

Compress Node.js API routes for optimized server deployment

BEFORE (Original JavaScript) 
const express = require("express");
const bcrypt = require("bcrypt");
const jwt = require("jsonwebtoken");
const { validationResult } = require("express-validator");

const router = express.Router();

// User authentication endpoint
router.post("/login", async (req, res) => {
  try {
    // Validate input
    const errors = validationResult(req);
    if (!errors.isEmpty()) {
      return res.status(400).json({
        success: false,
        message: "Validation failed",
        errors: errors.array()
      });
    }

    const { email, password } = req.body;
    
    // Find user in database
    const user = await User.findOne({ email });
    if (!user) {
      return res.status(401).json({
        success: false,
        message: "Invalid credentials"
      });
    }

    // Verify password
    const isValidPassword = await bcrypt.compare(password, user.password);
    if (!isValidPassword) {
      return res.status(401).json({
        success: false,
        message: "Invalid credentials"
      });
    }

    // Generate JWT token
    const token = jwt.sign(
      { userId: user._id, email: user.email },
      process.env.JWT_SECRET,
      { expiresIn: "24h" }
    );

    res.json({
      success: true,
      message: "Login successful",
      token,
      user: {
        id: user._id,
        email: user.email,
        name: user.name
      }
    });
  } catch (error) {
    console.error("Login error:", error);
    res.status(500).json({
      success: false,
      message: "Internal server error"
    });
  }
});
AFTER (Minified JavaScript) 
const e=require("express"),r=require("bcrypt"),s=require("jsonwebtoken"),{validationResult:t}=require("express-validator"),a=e.Router();a.post("/login",(async(e,a)=>{try{const o=t(e);if(!o.isEmpty())return a.status(400).json({success:!1,message:"Validation failed",errors:o.array()});const{email:n,password:i}=e.body,c=await User.findOne({email:n});if(!c)return a.status(401).json({success:!1,message:"Invalid credentials"});if(!await r.compare(i,c.password))return a.status(401).json({success:!1,message:"Invalid credentials"});const u=s.sign({userId:c._id,email:c.email},process.env.JWT_SECRET,{expiresIn:"24h"});a.json({success:!0,message:"Login successful",token:u,user:{id:c._id,email:c.email,name:c.name}})}catch(e){console.error("Login error:",e),a.status(500).json({success:!1,message:"Internal server error"})}}));
Technical Features
  • AST parsing for safe transformations
  • Variable name shortening with scope preservation
  • Dead code elimination
  • Function inlining and constant folding optimizations
  • ECMAScript 2015-2023 compatibility with Babel integration
  • Source map generation for production debugging
Professional Use Cases
Production Deployment
Reduce bundle sizes for faster page loads
CDN Optimization
Minimize bandwidth costs
Mobile Performance
Optimize JavaScript for mobile devices with limited resources
CI/CD Pipelines
Automate code minification in build processes
Library Distribution
Reduce npm package sizes for faster installations
Progressive Web Apps
Optimize service workers and app shell for better caching
Best Practices
  • Test minified code thoroughly before production
  • Enable source maps for debugging
  • Monitor bundle size impact
  • Implement automated minification in your build pipeline
  • Keep original source code in version control
  • Monitor bundle size impact on Core Web Vitals and performance metrics
Troubleshooting Guide
Syntax Errors After Minification
Check ES6+ features in legacy environments
Broken Functionality
Disable variable mangling for third-party libraries
Source Map Issues
Ensure proper source map configuration and file paths
Large File Processing
Split large files into smaller chunks or use streaming processing
Third-party Integration
Use exclude patterns for external libraries that should not be minified