How To Convert a String to Boolean in JavaScript

JavaScript has several ways to convert a string to a boolean. One way is to use the Boolean() function, which returns the boolean value of a given variable. For example:

let str = "true";
let bool = Boolean(str);
console.log(bool); // outputs: true

Another way is to use the == or === operator to compare the string to the boolean values true or false. The == operator performs type coercion, meaning it will try to convert the string to a boolean before comparing it. The === operator, on the other hand, does not perform type coercion and compares the string and boolean values directly.

let str = "true";
let bool = (str == true);
console.log(bool); // outputs: true

let str = "true";
let bool = (str === true);
console.log(bool); // outputs: false

Another way to convert string to boolean is using JSON.parse() method which parses a string as JSON and returns JavaScript objects.

let str = "true";
let bool = JSON.parse(str);
console.log(bool); // outputs: true

You can also use if(str) statement. In this case if the string is “truthy” it will return true, otherwise false.

let str = "true";
if(str) {
    console.log(true);
}
else {
    console.log(false);
} // outputs: true

In JavaScript, the following values are considered “falsy”:

• false
• 0 (zero)
• "" (empty string)
• null
• undefined
• NaN

So, if you use if(str) statement, it will return true for any string which is not “falsy”.

It is important to note that when using the == operator, the string “false” will be considered true because it is not one of the falsy values listed above. To avoid this, it is best to use the === operator or the Boolean() function when converting strings to booleans in JavaScript.