How can I convert a string to boolean in JavaScript?

This tutorial will show you how to convert a string into a JavaScript boolean. You might have a string that is “true” or something like that. To make the java script string a boolean value, you need to make sure that it’s either 0 or true.

Casting to boolean can be done in many different ways. JavaScript may use vanilla js, or other libraries to perform true and false conversions. Let’s look at some examples.

Example 1:

stringToBoolean: function(string){
        case "true": case "yes": case "1": return true;
        case "false": case "no": case "0": case null: return false;
        default: return Boolean(string);

Example 2:

if (String(a).toLowerCase() == “true”) …

It’s true:

String(true) == "true"     //returns true
String(false) == "true"    //returns false
String("true") == "true"   //returns true
String("false") == "true"  //returns false

Example 3:

var parseBool = function(str) 
    // console.log(typeof str);
    // strict: JSON.parse(str)

    if(str == null)
        return false;

    if (typeof str === 'boolean')
        return (str === true);

    if(typeof str === 'string')
        if(str == "")
            return false;

        str = str.replace(/^\s+|\s+$/g, '');
        if(str.toLowerCase() == 'true' || str.toLowerCase() == 'yes')
            return true;

        str = str.replace(/,/g, '.');
        str = str.replace(/^\s*\-\s*/g, '-');

    // var isNum = string.match(/^[0-9]+$/) != null;
    // var isNum = /^\d+$/.test(str);
        return (parseFloat(str) != 0);

    return false;

These resources might be of interest:

How Lack of Rest Can Impact Your Finances Small Businesses Can Enhance File Management Following these Tips How Much Do Real Estate Agents Spend on Marketing? How to Engage Your Online Audience for Long-Lasting Success Why is Plagiarism Such a Big Deal? Resume Service Review: Why Everyone Should Use It