{"id":201437,"date":"2025-01-10T04:48:37","date_gmt":"2025-01-10T04:48:37","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/how-to-check-boolean-value-in-javascript\/"},"modified":"2025-01-10T04:48:37","modified_gmt":"2025-01-10T04:48:37","slug":"how-to-check-boolean-value-in-javascript","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/how-to-check-boolean-value-in-javascript\/","title":{"rendered":"How to check boolean value in JavaScript?"},"content":{"rendered":"<p>**To check a boolean value in JavaScript, you can simply use an if statement or a conditional (ternary) operator. For example:**<\/p>\n<p>&#8220;`javascript<br \/>\nlet bool = true;<\/p>\n<p>if (bool) {<br \/>\n  console.log(&#8220;The boolean value is true&#8221;);<br \/>\n} else {<br \/>\n  console.log(&#8220;The boolean value is false&#8221;);<br \/>\n}<br \/>\n&#8220;`<\/p>\n<p>Alternatively, you can use the conditional operator like this:<\/p>\n<p>&#8220;`javascript<br \/>\nlet bool = true;<br \/>\nlet result = bool ? &#8220;The boolean value is true&#8221; : &#8220;The boolean value is false&#8221;;<br \/>\nconsole.log(result);<br \/>\n&#8220;`<\/p>\n<p>This will output &#8220;The boolean value is true&#8221; to the console.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_62 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-boolean-value-in-javascript\/#How_to_check_if_a_variable_is_a_boolean_in_JavaScript\" title=\"How to check if a variable is a boolean in JavaScript?\">How to check if a variable is a boolean in JavaScript?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-boolean-value-in-javascript\/#How_to_convert_a_boolean_value_to_a_string_in_JavaScript\" title=\"How to convert a boolean value to a string in JavaScript?\">How to convert a boolean value to a string in JavaScript?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-boolean-value-in-javascript\/#How_to_check_if_a_string_is_a_boolean_in_JavaScript\" title=\"How to check if a string is a boolean in JavaScript?\">How to check if a string is a boolean in JavaScript?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-boolean-value-in-javascript\/#How_to_toggle_a_boolean_value_in_JavaScript\" title=\"How to toggle a boolean value in JavaScript?\">How to toggle a boolean value in JavaScript?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-boolean-value-in-javascript\/#How_to_check_if_a_variable_is_truthy_or_falsy_in_JavaScript\" title=\"How to check if a variable is truthy or falsy in JavaScript?\">How to check if a variable is truthy or falsy in JavaScript?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-boolean-value-in-javascript\/#How_to_compare_two_boolean_values_in_JavaScript\" title=\"How to compare two boolean values in JavaScript?\">How to compare two boolean values in JavaScript?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-boolean-value-in-javascript\/#How_to_check_if_a_variable_is_undefined_or_null_in_JavaScript\" title=\"How to check if a variable is undefined or null in JavaScript?\">How to check if a variable is undefined or null in JavaScript?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-boolean-value-in-javascript\/#How_to_check_if_a_variable_is_not_a_boolean_in_JavaScript\" title=\"How to check if a variable is not a boolean in JavaScript?\">How to check if a variable is not a boolean in JavaScript?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-boolean-value-in-javascript\/#How_to_create_a_boolean_variable_in_JavaScript\" title=\"How to create a boolean variable in JavaScript?\">How to create a boolean variable in JavaScript?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-boolean-value-in-javascript\/#How_to_check_if_a_number_is_a_boolean_in_JavaScript\" title=\"How to check if a number is a boolean in JavaScript?\">How to check if a number is a boolean in JavaScript?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-boolean-value-in-javascript\/#How_to_check_if_a_variable_is_a_boolean_object_in_JavaScript\" title=\"How to check if a variable is a boolean object in JavaScript?\">How to check if a variable is a boolean object in JavaScript?<\/a><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"How_to_check_if_a_variable_is_a_boolean_in_JavaScript\"><\/span>How to check if a variable is a boolean in JavaScript?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>To check if a variable is a boolean in JavaScript, you can use the typeof operator. For example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet bool = true;<br \/>\nconsole.log(typeof bool === &#8216;boolean&#8217;); \/\/ Output: true<br \/>\n&#8220;`<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_convert_a_boolean_value_to_a_string_in_JavaScript\"><\/span>How to convert a boolean value to a string in JavaScript?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can convert a boolean value to a string in JavaScript by using the toString() method or by concatenating an empty string to the boolean value. For example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet bool = true;<br \/>\nconsole.log(bool.toString()); \/\/ Output: &#8220;true&#8221;<br \/>\nconsole.log(&#8221; + bool); \/\/ Output: &#8220;true&#8221;<br \/>\n&#8220;`<\/p>\n<p>These methods will convert the boolean value to a string representation.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_check_if_a_string_is_a_boolean_in_JavaScript\"><\/span>How to check if a string is a boolean in JavaScript?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>To check if a string is a boolean in JavaScript, you can compare it to either &#8220;true&#8221; or &#8220;false&#8221;. For example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet str = &#8220;true&#8221;;<br \/>\nconsole.log(str === &#8220;true&#8221; || str === &#8220;false&#8221;); \/\/ Output: true<br \/>\n&#8220;`<\/p>\n<p>This will return true if the string is either &#8220;true&#8221; or &#8220;false&#8221;.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_toggle_a_boolean_value_in_JavaScript\"><\/span>How to toggle a boolean value in JavaScript?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can toggle a boolean value in JavaScript by using the ! (logical NOT) operator. For example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet bool = true;<br \/>\nbool = !bool;<br \/>\nconsole.log(bool); \/\/ Output: false<br \/>\n&#8220;`<\/p>\n<p>This will toggle the boolean value from true to false (or vice versa).<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_check_if_a_variable_is_truthy_or_falsy_in_JavaScript\"><\/span>How to check if a variable is truthy or falsy in JavaScript?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>To check if a variable is truthy or falsy in JavaScript, you can simply use it in a boolean context (such as in an if statement). For example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet value = 0;<br \/>\nif (value) {<br \/>\n  console.log(&#8220;Truthy&#8221;);<br \/>\n} else {<br \/>\n  console.log(&#8220;Falsy&#8221;);<br \/>\n}<br \/>\n&#8220;`<\/p>\n<p>In this case, the output will be &#8220;Falsy&#8221; since 0 is considered falsy in JavaScript.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_compare_two_boolean_values_in_JavaScript\"><\/span>How to compare two boolean values in JavaScript?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can compare two boolean values in JavaScript using the strict equality operator (===) or the loose equality operator (==). For example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet bool1 = true;<br \/>\nlet bool2 = false;<br \/>\nconsole.log(bool1 === bool2); \/\/ Output: false<br \/>\n&#8220;`<\/p>\n<p>This will return false since the two boolean values are not equal.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_check_if_a_variable_is_undefined_or_null_in_JavaScript\"><\/span>How to check if a variable is undefined or null in JavaScript?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>To check if a variable is undefined or null in JavaScript, you can use strict equality (===) or the typeof operator. For example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet value;<br \/>\nconsole.log(value === undefined); \/\/ Output: true<br \/>\nconsole.log(value === null); \/\/ Output: false<br \/>\n&#8220;`<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_check_if_a_variable_is_not_a_boolean_in_JavaScript\"><\/span>How to check if a variable is not a boolean in JavaScript?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>To check if a variable is not a boolean in JavaScript, you can use the logical NOT operator (!) along with the typeof operator. For example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet value = 42;<br \/>\nconsole.log(typeof value !== &#8216;boolean&#8217;); \/\/ Output: true<br \/>\n&#8220;`<\/p>\n<p>This will return true if the variable is not a boolean.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_create_a_boolean_variable_in_JavaScript\"><\/span>How to create a boolean variable in JavaScript?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can create a boolean variable in JavaScript by simply assigning true or false to a variable. For example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet bool = true;<br \/>\n&#8220;`<\/p>\n<p>This will create a boolean variable with the value true.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_check_if_a_number_is_a_boolean_in_JavaScript\"><\/span>How to check if a number is a boolean in JavaScript?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>To check if a number is a boolean in JavaScript, you can compare it to 0 and 1. For example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet num = 1;<br \/>\nconsole.log(num === 0 || num === 1); \/\/ Output: true<br \/>\n&#8220;`<\/p>\n<p>This will return true if the number is either 0 or 1.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_check_if_a_variable_is_a_boolean_object_in_JavaScript\"><\/span>How to check if a variable is a boolean object in JavaScript?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>To check if a variable is a boolean object in JavaScript, you can use the instanceof operator. For example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet bool = new Boolean(true);<br \/>\nconsole.log(bool instanceof Boolean); \/\/ Output: true<br \/>\n&#8220;`<\/p>\n<p>This will return true if the variable is a boolean object.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>**To check a boolean value in JavaScript, you can simply use an if statement or a conditional (ternary) operator. For example:** &#8220;`javascript let bool = true; if (bool) { console.log(&#8220;The boolean value is true&#8221;); } else { console.log(&#8220;The boolean value is false&#8221;); } &#8220;` Alternatively, you can use the conditional operator like this: &#8220;`javascript let &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"How to check boolean value in JavaScript?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-boolean-value-in-javascript\/#more-201437\">Read more<span class=\"screen-reader-text\">How to check boolean value in JavaScript?<\/span><\/a><\/p>\n","protected":false},"author":51,"featured_media":107420,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86279],"tags":[],"class_list":["post-201437","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to check boolean value in JavaScript?<\/title>\n<meta name=\"description\" content=\"**To check a boolean value in JavaScript, you can simply use an if statement or a conditional (ternary) operator. 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