console.log inconsistent with JSON.stringify

Question

I have reason to believe console.log and JSON.stringify can produce inconsistent views of the same object even if it was created in a straightforward manner (see notes).

Situation

In both Google Chrome developer tools and Firebug, I had an object obj which console.log printed out as { players: {0: ...}, ...}, while JSON.stringify reported { players: {}, ...}. obj.players was {} under both functions, so it seems that console.log is the culprit. Could it be asynchronous/non-deterministic in some way?

Additional notes

I'm afraid I won't be able to provide much more context, since the code is lengthy and for a client, but I can try if there is something that could help get to the bottom this. For the moment, I am forced to stay away from console.log for inspection.

It might be useful to know that the object is formed merely from an object literal by setting properties by hand, e.g., obj.players = {}; obj.players[0] = ....

Code

A sample of what I mean can be observed at http://jsfiddle.net/9dcJP/.

Answer 1

Why don't you just use console.dir(obj) instead? Or use console.log(obj) and then click on the output / expand it?

Also when I try the following code:

var obj = {};
obj.players = {};
obj.players[0] = {color: "green"};
obj.players[1] = {color: "blue"};
obj.world = "xyz";
console.log(JSON.stringify(obj));

I always (Firefox, Chrome, Opera) get this as output:

{"players":{"0":{"color":"green"},"1":{"color":"blue"}},"world":"xyz"}

Furthermore it looks like your players object is actually an array. So you should better create it as such.

Update: I just saw that you added a link to a JSFIDDLE demo, which empties the players object right after logging it. To my knowledge all web dev tools use some kind of asynchronous display, which results in an empty players object when using console.log(obj) or console.dir(obj). Firebug thereby offers the best results by displaying the object correctly using console.dir(obj).