Question

15

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

rated 0 times [ 22] [ 7] / answers: 1 / hits: 22869 / 10 Years ago, thu, june 5, 2014, 12:00:00

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.

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anabellejaynav

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4 Years ago

answered 10 Years ago luzv · Accepted Answer

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.