Can't access object property, even though it shows up in a console log

The elusive properties: understanding the basics

If a property shows in a console log but you can't access it directly, it's often due to asynchronous updates or non-enumerable properties. Use the following trick to glance at an object's keys at a specific moment:

console.log(Object.keys(object)); // De-mystifying your object!


To get a snapshot of the object at that point in time, JSON.stringify it:

console.log(JSON.stringify(object, null, 2)); // Snapshot at 86,400 FPS


For stealthy, non-enumerable properties hiding in the shadows, use Object.getOwnPropertyNames(object). Here's looking at you, prop!

Mastering asynchronous behavior

Sailing through async storms

Asynchronous code loves playing hide and seek with properties. Make sure your promises are resolved and all asynchronous operations completed before trying to access properties.

Mongoose traps

If you're using MongoDB with Mongoose, your Schema may not be aware of the property you're trying to access. It's like that awkward moment when you forget someone's name. Be a good host, update your schema to welcome all properties.

Dot vs Bracket notation

Properties with dynamic names or special characters feel left out with dot notation. Bring them into the conversation with bracket notation:

console.log(object['my-precious-property']); // Gollum would approve


Navigating through async maze

setTimeout to the rescue

Sometimes, giving async code a bit of breathing space helps. Wrap your console.log in a setTimeout:

setTimeout(() => console.log(object.property), 1000); // Gives you enough time to grab a coffee!


Execution & sequence

Being single-threaded, JavaScript runs one task at a time, from top to bottom. So make sure your property access isn't ahead of its initialisation in the sequence. In JavaScript, timing isn't everything; it's the only thing!

Know thy console

Remember, the JavaScript console shows the current state of an object, not its state at the time of the console.log(). If only life could be so convenient!