How to check if a string is empty in JavaScript

You can use the strict equality operator (===) to check if a string is empty or not.
 
The comparison str === "" returns true only if the data type of the value is string and it is not empty, otherwise returns false as shown in the following example:

if(str === ""){
    // The string 'str' is empty
}else{
    // The string 'str' is not empty
}

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