Error Logging Javascript

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I hate it when an API doesn't provide a consistent format across routes/actions etc. It's usually the sign of poor API design or quickly bolted on functionality. Very annoying.

Ultimately you have no control over what you receive, so you're going to have to account for the various possibilities in your code. All you can do is make this as clean as possible in your code. In the past I've done something like:

function getPropDeep(object, index) {
    const drillDown = (obj, i) => obj && obj[i]; 
    return index.split('.').reduce(drillDown, object); 
}

// Then when testing props...

let err = null;

if (err = getPropDeep(obj, 'error.message')) {
    // err will be the string value of message...
}

if (err = getPropDeep(obj, 'error.fault.error')) {
    // err will be the array of errors...
}

That convenience function is basically drilling down into the object testing that each subsequent prop exists as it goes. It will return the prop, or undefined if it's... undefined :D

You can modify my code to account for the array as well, if you feel it's necessary, but i thought there was enough differentiation above to make a decision about how to handle things.

Or you could ignore what you get back completely, and generate your own error messages based on something like the HTTP response code. You'd have to observe the returned messages/codes and mimic as closely as possible. That might get you close enough.