I want to access console.log data programmatically and so I need to implement a console.log which stores its data in a global variable or file.

Can anyone tell me how to do this?

I want to access console.log data programmatically and so I need to implement a console.log which stores its data in a global variable or file.

Can anyone tell me how to do this?

• javascript
• jquery

Share Improve this question Follow edited May 29, 2017 at 20:12 Badacadabra 8,53577 gold badges3131 silver badges5454 bronze badges asked Feb 3, 2015 at 6:01 Query21Query21 20022 silver badges1010 bronze badges 1

• You want a logger kind of stuff? Also have a look @ Log Level - Minimal lightweight simple logging for JavaScript. loglevel replaces console.log() and friends with level-based logging and filtering, with none of console's downsides. – Shubh Commented Feb 3, 2015 at 6:07

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1 Answer 1

Sorted by: Reset to default 5

EDIT 2

Do use a library like loglevel

See the answers below to understand how you can implement something like this by yourself.

original answer:

Do something like:

var myLogs = [];
(function () {
  var log = console.log;
  console.log = function () {
    var args = Array.prototype.slice.call(arguments)
    log.apply(this, args );
    myLogs.push(args);
  };
}());

The gloabl variable myLogs will contain your log data.

You may want to adopt the code to your needs. Maybe you want to make one string out of the args array.

EDIT

If you want to have console.log, console.error, console.warn, console.info and store the log level:

var logData = [];
(function () {
    var log = console.log,
        error = console.error,
        warn = console.warn,
        info = console.info;

    console.log = function () {
        var args = Array.prototype.slice.call(arguments)
        log.apply(this, args );
        logData.push({level: "log", arguments: args});
    };
    console.error = function () {
        var args = Array.prototype.slice.call(arguments)
        error.apply(this, args );
        logData.push({level: "error", arguments: args});
    };
    console.warn = function () {
        var args = Array.prototype.slice.call(arguments)
        warn.apply(this, args );
        logData.push({level: "warn", arguments: args});
    };
    console.info = function () {
        var args = Array.prototype.slice.call(arguments)
        info.apply(this, args );
        logData.push({level: "info", arguments: args});
    };
}());