If you're looking for a solution—one that doesn't require complex installations or cloud dependencies—you're likely looking for a tool like de4js . What is a JavaScript Deobfuscator & Unpacker?
Converting "hello" into "\x68\x65\x6c\x6c\x6f" or Base64 encoding. javascript+deobfuscator+and+unpacker+portable
Download open-source deobfuscation utilities directly to your portable drive. If you're looking for a solution—one that doesn't