Javascript-obfuscator-4.2.5 Online

npm install -g javascript-obfuscator@4.2.5 javascript-obfuscator input.js --output output.js --compact true --control-flow-flattening true

Before: fetch("https://api.com") After: fetch(_0x3a2b[0x2] + _0x3a2b[0x5])

Original:

var state = 0; while(true) { switch(state) { case 0: if(user.isAdmin) { state=1; continue; } else { state=2; continue; } case 1: grantAccess(); state=3; break; case 2: deny(); state=3; break; case 3: break; } } It’s ugly, slow, and very hard to follow.

All string literals ( "apiKey" , "https://example.com" ) are moved into a giant array, then replaced with array lookups. 4.2.5 adds randomized rotations, so the array’s order shifts every build. javascript-obfuscator-4.2.5

If someone tries to beautify or format the output, the code detects changes to its own structure and stops executing. Useful for anti-tamper, but breaks if you ever need to debug your own production code. How to Install and Use v4.2.5 You can pin this exact version in any Node.js 12+ environment.

const obfuscated = JavaScriptObfuscator.obfuscate(sourceCode, { compact: true, controlFlowFlattening: true, controlFlowFlatteningThreshold: 0.75, numbersToExpressions: true, simplify: true, stringArray: true, stringArrayThreshold: 0.8, selfDefending: false, // Set true with caution deadCodeInjection: true, debugProtection: true // Disables DevTools console }); npm install -g javascript-obfuscator@4

4.2.5 randomly injects useless instructions – no-ops, unreachable branches, dummy calculations – that never affect the final result but drown a reverse engineer in noise.