How to get the console.log content as string in JavaScript

console, javascript, logging

Solution

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.

Problem

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 string. For example: ``` function doSomething(){ console.log("start"); console.log("end"); var consoleLog = getConsoleLog(); return consoleLog; } function getConsoleLog(){ // How to implement this? } alert(doSomething()); ``` JSFiddle link Note that I do not need to alert the log - this is just a simple example of testing the functionality. I'll have to do some operations on the log's content.

Original source