Checking for Empty, Undefined, or Null Strings in JavaScript

When working with JavaScript, you’ll frequently need to verify if a string is empty, undefined, or null. This is especially common in web applications where user input must be validated. In this post, we’ll explore multiple ways to check for empty or undefined strings, using various methods, each with its own pros and cons.

Basic Falsy Check

In JavaScript, the concept of truthy and falsy values plays a significant role. A falsy value is a value that translates to false when evaluated in a Boolean context. The most common falsy values are:

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