{"id":12131,"date":"2023-11-06T17:40:41","date_gmt":"2023-11-07T00:40:41","guid":{"rendered":"https:\/\/www.mysqltutorial.org\/?page_id=12131"},"modified":"2023-11-23T05:46:47","modified_gmt":"2023-11-23T12:46:47","slug":"mysql-json_object","status":"publish","type":"page","link":"https:\/\/www.mysqltutorial.org\/mysql-json\/mysql-json_object\/","title":{"rendered":"MySQL JSON_OBJECT() Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the <code>JSON_OBJECT()<\/code> function to create a JSON object from a list of key-value pairs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to MySQL JSON_OBJECT() function<\/h2>\n\n\n\n<p>The <code>JSON_OBJECT()<\/code> function allows you to create a JSON object from a list of key-value pairs.<\/p>\n\n\n\n<p>Here&#8217;s the syntax of the <code>JSON_OBJECT()<\/code> function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">JSON_OBJECT(&#91;key1, value1, key2, value2, ...])<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this syntax:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>key1<\/code>, <code>key2<\/code>, &#8230;: A list of keys for the JSON object.<\/li>\n\n\n\n<li><code>value1<\/code>, <code>value2<\/code>, &#8230;: A list of corresponding values for the JSON object.<\/li>\n<\/ul>\n\n\n\n<p>The <code>JSON_OBJECT()<\/code> function returns a JSON object whose property names and values are the corresponding key\/value pairs.<\/p>\n\n\n\n<p>The function raises an error if any key is <code>NULL<\/code> or the number of arguments that you pass to the function is odd.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">MySQL JSON_OBJECT() function examples<\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>JSON_OBJECT()<\/code> function<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1) Creating a simple JSON object<\/h3>\n\n\n\n<p>The following example uses the <code>JSON_OBJECT()<\/code> function to create a simple JSON object from a list of key-value pairs:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> \n  JSON_OBJECT(\n    <span class=\"hljs-string\">'name'<\/span>, <span class=\"hljs-string\">'John'<\/span>, <span class=\"hljs-string\">'age'<\/span>, <span class=\"hljs-number\">30<\/span>\n  ) <span class=\"hljs-keyword\">result<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">+<span class=\"hljs-comment\">-----------------------------+<\/span>\n| result                      |\n+<span class=\"hljs-comment\">-----------------------------+<\/span>\n| {\"age\": 30, \"name\": \"John\"} |\n+<span class=\"hljs-comment\">-----------------------------+<\/span>\n1 row in <span class=\"hljs-keyword\">set<\/span> (<span class=\"hljs-number\">0.00<\/span> sec)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The result object has two keys <code>\"age\"<\/code> and <code>\"name\"<\/code> with the corresponding values <code>30<\/code> and <code>\"John\"<\/code>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2) Creating a nested JSON object<\/h3>\n\n\n\n<p>The following example uses the <code>JSON_OBJECT()<\/code> function to create a nested JSON object:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> \n  JSON_PRETTY(\n    JSON_OBJECT(\n      <span class=\"hljs-string\">'name'<\/span>, \n      <span class=\"hljs-string\">'John'<\/span>, \n      <span class=\"hljs-string\">'age'<\/span>, \n      <span class=\"hljs-number\">30<\/span>, \n      <span class=\"hljs-string\">'phones'<\/span>, \n      JSON_OBJECT(\n        <span class=\"hljs-string\">'home'<\/span>, <span class=\"hljs-string\">'408-999-9999'<\/span>, <span class=\"hljs-string\">'work'<\/span>, <span class=\"hljs-string\">'408-111-2222'<\/span>\n      )\n    )\n  ) <span class=\"hljs-keyword\">result<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">+<span class=\"hljs-comment\">-------------------------------------------------------------------------------------------------------------+<\/span>\n| result                                                                                                      |\n+<span class=\"hljs-comment\">-------------------------------------------------------------------------------------------------------------+<\/span>\n| {\n  \"age\": 30,\n  \"name\": \"John\",\n  \"phones\": {\n    \"home\": \"408-999-9999\",\n    \"work\": \"408-111-2222\"\n  }\n} |\n+<span class=\"hljs-comment\">-------------------------------------------------------------------------------------------------------------+<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\">3) Combining JSON_OBJECT() with JSON_ARRAY() function<\/h3>\n\n\n\n<p>The following example uses the <code>JSON_OBJECT()<\/code> function with the <a href=\"https:\/\/www.mysqltutorial.org\/mysql-json\/mysql-json_array\/\">JSON_ARRAY()<\/a> function to create an array of JSON objects:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> \n  JSON_ARRAY(\n    JSON_OBJECT(<span class=\"hljs-string\">'name'<\/span>, <span class=\"hljs-string\">'John'<\/span>, <span class=\"hljs-string\">'age'<\/span>, <span class=\"hljs-number\">25<\/span>), \n    JSON_OBJECT(<span class=\"hljs-string\">'name'<\/span>, <span class=\"hljs-string\">'Jane'<\/span>, <span class=\"hljs-string\">'age'<\/span>, <span class=\"hljs-number\">28<\/span>)\n  ) <span class=\"hljs-keyword\">result<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">+<span class=\"hljs-comment\">------------------------------------------------------------+<\/span>\n| result                                                     |\n+<span class=\"hljs-comment\">------------------------------------------------------------+<\/span>\n| &#91;{\"age\": 25, \"name\": \"John\"}, {\"age\": 28, \"name\": \"Jane\"}] |\n+<span class=\"hljs-comment\">------------------------------------------------------------+<\/span>\n1 row in <span class=\"hljs-keyword\">set<\/span> (<span class=\"hljs-number\">0.00<\/span> sec)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\">4) Creating JSON objects dynamically<\/h3>\n\n\n\n<p>We&#8217;ll use the <code>employees<\/code> table from the <a href=\"https:\/\/www.mysqltutorial.org\/getting-started-with-mysql\/mysql-sample-database\/\">sample database<\/a>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2023\/10\/employees.svg\" alt=\"\" class=\"wp-image-10759\"\/><\/figure>\n\n\n\n<p>The following example creates JSON objects dynamically using values from the <code>firstName<\/code> and <code>email <\/code>columns in the <code>employees<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> \n  JSON_OBJECT(\n    <span class=\"hljs-string\">'firstName'<\/span>, firstName, <span class=\"hljs-string\">'email'<\/span>, email\n  ) <span class=\"hljs-keyword\">result<\/span> \n<span class=\"hljs-keyword\">FROM<\/span> \n  employees;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">+<span class=\"hljs-comment\">----------------------------------------------------------------------+<\/span>\n| result                                                               |\n+<span class=\"hljs-comment\">----------------------------------------------------------------------+<\/span>\n| {\"email\": \"dmurphy@classicmodelcars.com\", \"firstName\": \"Diane\"}      |\n| {\"email\": \"mpatterso@classicmodelcars.com\", \"firstName\": \"Mary\"}     |\n| {\"email\": \"jfirrelli@classicmodelcars.com\", \"firstName\": \"Jeff\"}     |\n...<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\">5) Error cases<\/h3>\n\n\n\n<p>The following example attempts to create a JSON object using the <code>JSON_OBJECT()<\/code> function but encounters an error due to an odd number of arguments:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">SELECT \n  JSON_OBJECT(\n    <span class=\"hljs-string\">'firstName'<\/span>, firstName, <span class=\"hljs-string\">'email'<\/span>\n  ) result \nFROM \n  employees;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-11\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">ERROR <span class=\"hljs-number\">1582<\/span> (<span class=\"hljs-number\">42000<\/span>): Incorrect parameter count <span class=\"hljs-keyword\">in<\/span> the call to native <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> '<span class=\"hljs-title\">JSON_OBJECT<\/span>'<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-11\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the <code>JSON_OBJECT()<\/code> function to create a JSON object from a list of key-value pairs.<\/li>\n<\/ul>\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<header>\n\t\t<div class=\"wth-question\">Was this tutorial helpful? <\/div>\n\t\t<div class=\"wth-thumbs\">\n\t\t\t<button\n\t\t\t\tdata-post=\"12131\"\n\t\t\t\tdata-post-url=\"https:\/\/www.mysqltutorial.org\/mysql-json\/mysql-json_object\/\"\n\t\t\t\tdata-post-title=\"MySQL JSON_OBJECT() 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tutorial, you will learn how to use the JSON_OBJECT() function to create a JSON object from a list of key-value pairs.<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":11973,"menu_order":2,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-12131","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>MySQL JSON_OBJECT() Function<\/title>\n<meta name=\"description\" content=\"In this tutorial, you will learn how to use the MySQL JSON_OBJECT() function to create a JSON object from a list of key-value pairs.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.mysqltutorial.org\/mysql-json\/mysql-json_object\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta 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