How To Get The Console.log Content As String In Javascript

I'm trying to get the console.log as string in pure JavaScript. My input is a script, which I'm not familiar with, and I want to collect all the messages in the console.log into a

Solution 1:

You could overwrite console.log method before using it:

var logBackup = console.log;
var logMessages = [];

console.log = function() {
    logMessages.push.apply(logMessages, arguments);
    logBackup.apply(console, arguments);
};

Using apply and arguments preserves the correct console.log behaviour, i.e. you can add multiple log messages with a single call.

It will push all new console.log messages to logMessages array.