How Can I Check for Empty Strings in JavaScript?

Checking for Empty Strings in JavaScript

In JavaScript, determining if a string is empty or undefined can be done in a few different ways.

Empty and Falsy Strings

To check if a string has any content at all (including the empty string ""), use the truthy/falsy value check:

if (strValue) { // strValue is non-empty string, true, 42, Infinity, [], ...
}
if (!strValue) { // strValue is empty string, false, 0, null, undefined, ...
}

Strict Empty Strings Only

If you want to check specifically for an empty string (""), use the strict equality operator ===:

if (strValue === "") { // strValue is empty string
}

Alternatively, use the !== operator to check for a non-empty string:

if (strValue !== "") { // strValue is not an empty string
}

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