How to Determine if a Value is null

You shouldn't use the typeof operator when checking if a value is null because typeof cannot distinguish a null from an object. You should use the === operator because == will return true if checking against an undefined variable.

const x = null;
typeof x; // 'object'
if (x === null) {
  // will execute
}
const y;
if (y == null) {
  // will execute even though
  // that is not the intention
}

More Fundamentals Tutorials

• Check if a Date is Valid in JavaScript
• Encode base64 in JavaScript
• Check if URL Contains a String
• JavaScript Add Month to Date
• JavaScript Add Days to Date
• 3 Patterns to Merge Arrays in JavaScript
• Convert a BigInt to a Number in JavaScript