stack-chain enhances JavaScript's error stack traces by providing cleaner, more readable output. It intercepts and modifies the Error.prepareStackTrace function, allowing for customizable formatting and inclusion of relevant information like file paths, line numbers, and function names. This library is helpful for debugging complex applications by presenting a clearer picture of the call stack leading to an error. It allows to see the true origin of an error even if it's obfuscated by libraries.