{"id":199191,"date":"2024-10-16T01:23:38","date_gmt":"2024-10-16T01:23:38","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/how-to-add-key-value-pair-in-an-object-javascript\/"},"modified":"2024-10-16T01:23:38","modified_gmt":"2024-10-16T01:23:38","slug":"how-to-add-key-value-pair-in-an-object-javascript","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/how-to-add-key-value-pair-in-an-object-javascript\/","title":{"rendered":"How to add key-value pair in an object JavaScript?"},"content":{"rendered":"<p>One of the common tasks in JavaScript programming is adding key-value pairs to an object. Objects in JavaScript are collections of key-value pairs, so adding a new key-value pair is a simple task. Here&#8217;s how you can add a key-value pair in an object using JavaScript.<\/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-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-key-value-pair-in-an-object-javascript\/#1_Using_dot_notation\" title=\"1. Using dot notation:\">1. Using dot notation:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-key-value-pair-in-an-object-javascript\/#2_Using_square_brackets\" title=\"2. Using square brackets:\">2. Using square brackets:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-key-value-pair-in-an-object-javascript\/#3_Adding_multiple_key-value_pairs\" title=\"3. Adding multiple key-value pairs:\">3. Adding multiple key-value pairs:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-key-value-pair-in-an-object-javascript\/#4_Adding_nested_key-value_pairs\" title=\"4. Adding nested key-value pairs:\">4. Adding nested key-value pairs:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-key-value-pair-in-an-object-javascript\/#5_Overwriting_existing_key-value_pair\" title=\"5. Overwriting existing key-value pair:\">5. Overwriting existing key-value pair:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-key-value-pair-in-an-object-javascript\/#6_Adding_key_with_a_variable_name\" title=\"6. Adding key with a variable name:\">6. Adding key with a variable name:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-key-value-pair-in-an-object-javascript\/#7_Adding_key_with_a_special_character\" title=\"7. Adding key with a special character:\">7. Adding key with a special character:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-key-value-pair-in-an-object-javascript\/#8_Adding_key_with_a_number\" title=\"8. Adding key with a number:\">8. Adding key with a number:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-key-value-pair-in-an-object-javascript\/#9_Adding_key_with_a_function\" title=\"9. Adding key with a function:\">9. Adding key with a function:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-key-value-pair-in-an-object-javascript\/#10_Adding_key_with_an_array\" title=\"10. Adding key with an array:\">10. Adding key with an array:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-key-value-pair-in-an-object-javascript\/#11_Adding_key_with_an_object\" title=\"11. Adding key with an object:\">11. Adding key with an object:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-key-value-pair-in-an-object-javascript\/#12_Adding_key_with_undefined_value\" title=\"12. Adding key with undefined value:\">12. Adding key with undefined value:<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"1_Using_dot_notation\"><\/span><strong>1. Using dot notation:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><\/p>\n<p>You can simply use the dot notation to add a new key-value pair to an object. Here&#8217;s an example:<\/p>\n<p>\n&#8220;`<br \/>\nlet myObject = {};<br \/>\nmyObject.key = &#8216;value&#8217;;<br \/>\n&#8220;`<\/p>\n<h2><span class=\"ez-toc-section\" id=\"2_Using_square_brackets\"><\/span><strong>2. Using square brackets:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><\/p>\n<p>Another way to add a key-value pair to an object is by using square brackets. Here&#8217;s an example:<\/p>\n<p>\n&#8220;`<br \/>\nlet myObject = {};<br \/>\nmyObject[&#8216;key&#8217;] = &#8216;value&#8217;;<br \/>\n&#8220;`<\/p>\n<h2><span class=\"ez-toc-section\" id=\"3_Adding_multiple_key-value_pairs\"><\/span><strong>3. Adding multiple key-value pairs:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><\/p>\n<p>You can also add multiple key-value pairs to an object using the same syntax. Here&#8217;s an example:<\/p>\n<p>\n&#8220;`<br \/>\nlet myObject = {};<br \/>\nmyObject.key1 = &#8216;value1&#8217;;<br \/>\nmyObject.key2 = &#8216;value2&#8217;;<br \/>\n&#8220;`<\/p>\n<h2><span class=\"ez-toc-section\" id=\"4_Adding_nested_key-value_pairs\"><\/span><strong>4. Adding nested key-value pairs:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><\/p>\n<p>If you want to add nested key-value pairs to an object, you can do so by creating objects inside objects. Here&#8217;s an example:<\/p>\n<p>\n&#8220;`<br \/>\nlet myObject = {};<br \/>\nmyObject.key = {};<br \/>\nmyObject.key.nestedKey = &#8216;nestedValue&#8217;;<br \/>\n&#8220;`<\/p>\n<h2><span class=\"ez-toc-section\" id=\"5_Overwriting_existing_key-value_pair\"><\/span><strong>5. Overwriting existing key-value pair:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><\/p>\n<p>If you try to add a key that already exists in the object, it will simply overwrite the existing value. Here&#8217;s an example:<\/p>\n<p>\n&#8220;`<br \/>\nlet myObject = {key: &#8216;oldValue&#8217;};<br \/>\nmyObject.key = &#8216;newValue&#8217;;<br \/>\n&#8220;`<\/p>\n<h2><span class=\"ez-toc-section\" id=\"6_Adding_key_with_a_variable_name\"><\/span><strong>6. Adding key with a variable name:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><\/p>\n<p>You can also use variables to dynamically add key-value pairs to an object. Here&#8217;s an example:<\/p>\n<p>\n&#8220;`<br \/>\nlet key = &#8216;dynamicKey&#8217;;<br \/>\nlet myObject = {};<br \/>\nmyObject[key] = &#8216;dynamicValue&#8217;;<br \/>\n&#8220;`<\/p>\n<h2><span class=\"ez-toc-section\" id=\"7_Adding_key_with_a_special_character\"><\/span><strong>7. Adding key with a special character:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><\/p>\n<p>If you want to add a key with a special character, you can do so by using square brackets. Here&#8217;s an example:<\/p>\n<p>\n&#8220;`<br \/>\nlet myObject = {};<br \/>\nmyObject[&#8216;special-key&#8217;] = &#8216;specialValue&#8217;;<br \/>\n&#8220;`<\/p>\n<h2><span class=\"ez-toc-section\" id=\"8_Adding_key_with_a_number\"><\/span><strong>8. Adding key with a number:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><\/p>\n<p>You can also add a key with a number as its name to an object. Here&#8217;s an example:<\/p>\n<p>\n&#8220;`<br \/>\nlet myObject = {};<br \/>\nmyObject[1] = &#8216;numberValue&#8217;;<br \/>\n&#8220;`<\/p>\n<h2><span class=\"ez-toc-section\" id=\"9_Adding_key_with_a_function\"><\/span><strong>9. Adding key with a function:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><\/p>\n<p>If you want to add a key with a function as its value, you can do so by defining a function and assigning it as a value. Here&#8217;s an example:<\/p>\n<p>\n&#8220;`<br \/>\nlet myObject = {};<br \/>\nmyObject.key = function(){ console.log(&#8216;Hello!&#8217;) };<br \/>\n&#8220;`<\/p>\n<h2><span class=\"ez-toc-section\" id=\"10_Adding_key_with_an_array\"><\/span><strong>10. Adding key with an array:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><\/p>\n<p>You can also add a key with an array as its value to an object. Here&#8217;s an example:<\/p>\n<p>\n&#8220;`<br \/>\nlet myObject = {};<br \/>\nmyObject.key = [&#8216;value1&#8217;, &#8216;value2&#8217;];<br \/>\n&#8220;`<\/p>\n<h2><span class=\"ez-toc-section\" id=\"11_Adding_key_with_an_object\"><\/span><strong>11. Adding key with an object:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><\/p>\n<p>If you want to add a key with an object as its value, you can do so by defining an object and assigning it as a value. Here&#8217;s an example:<\/p>\n<p>\n&#8220;`<br \/>\nlet myObject = {};<br \/>\nmyObject.key = { nestedKey: &#8216;nestedValue&#8217; };<br \/>\n&#8220;`<\/p>\n<h2><span class=\"ez-toc-section\" id=\"12_Adding_key_with_undefined_value\"><\/span><strong>12. Adding key with undefined value:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><\/p>\n<p>If you want to add a key with an undefined value, you can do so simply by not assigning any value to the key. Here&#8217;s an example:<\/p>\n<p>\n&#8220;`<br \/>\nlet myObject = {};<br \/>\nmyObject.key = undefined;<br \/>\n&#8220;`<\/p>\n","protected":false},"excerpt":{"rendered":"<p>One of the common tasks in JavaScript programming is adding key-value pairs to an object. Objects in JavaScript are collections of key-value pairs, so adding a new key-value pair is a simple task. Here&#8217;s how you can add a key-value pair in an object using JavaScript. 1. Using dot notation: You can simply use the &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"How to add key-value pair in an object JavaScript?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/how-to-add-key-value-pair-in-an-object-javascript\/#more-199191\">Read more<span class=\"screen-reader-text\">How to add key-value pair in an object 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-199191","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 add key-value pair in an object JavaScript?<\/title>\n<meta name=\"description\" content=\"One of the common tasks in JavaScript programming is adding key-value pairs to an object. 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