{"id":12144,"date":"2023-11-07T00:52:50","date_gmt":"2023-11-07T07:52:50","guid":{"rendered":"https:\/\/www.mysqltutorial.org\/?page_id=12144"},"modified":"2023-11-07T00:52:59","modified_gmt":"2023-11-07T07:52:59","slug":"mysql-json_length","status":"publish","type":"page","link":"https:\/\/www.mysqltutorial.org\/mysql-json\/mysql-json_length\/","title":{"rendered":"MySQL JSON_LENGTH() Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the MySQL <code>JSON_LENGTH()<\/code> function to get the length of a JSON document.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to MySQL JSON_LENGTH() function<\/h2>\n\n\n\n<p>The <code>JSON_LENGTH()<\/code> function returns the length of a JSON document. Here&#8217;s the syntax of the <code>JSON_LENGTH()<\/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_LENGTH(json_doc&#91;, path])<\/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>json_doc<\/code>: This is the JSON document you want to get the length.<\/li>\n\n\n\n<li><code>path<\/code>: This is an optional argument. If you provide the <a href=\"https:\/\/www.mysqltutorial.org\/mysql-json\/mysql-json-path\/\">path<\/a>, the <code>JSON_LENGTH()<\/code> function will return the length of the value within the <code>json_doc<\/code> located by the path. <\/li>\n<\/ul>\n\n\n\n<p>The <code>JSON_LENGTH()<\/code> function returns <code>NULL<\/code> if any argument is <code>NULL<\/code> or the path does not identify any value in the JSON document.<\/p>\n\n\n\n<p>The <code>JSON_LENGTH()<\/code> function raises an error if the <code>json_doc<\/code> is not a valid JSON document or the path is not a valid path expression.<\/p>\n\n\n\n<p>The <code>JSON_LENGTH<\/code> calculates the length of a JSON document as follows:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A scalar has a length of 1.<\/li>\n\n\n\n<li>An array has a length of the number of array elements.<\/li>\n\n\n\n<li>An object has the length of the number of object members.<\/li>\n<\/ul>\n\n\n\n<p>The function doesn&#8217;t consider the length of nested arrays or objects.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">MySQL JSON_LENGTH() function example<\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>JSON_LENGTH()<\/code> function.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1) Getting the length of a scalar<\/h3>\n\n\n\n<p>The following example uses the <code>JSON_LENGTH()<\/code> function to return the length of a scalar:<\/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_LENGTH(<span class=\"hljs-string\">'\"Hello\"'<\/span>) <span class=\"hljs-keyword\">length<\/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| length |\n+<span class=\"hljs-comment\">--------+<\/span>\n|      1 |\n+<span class=\"hljs-comment\">--------+<\/span>\n1 row in <span class=\"hljs-keyword\">set<\/span> (<span class=\"hljs-number\">0.01<\/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<h3 class=\"wp-block-heading\">2) Getting the length of an array<\/h3>\n\n\n\n<p>The following example uses the <code>JSON_LENGTH()<\/code> function to return the number of elements in an array:<\/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_LENGTH(<span class=\"hljs-string\">'&#91;1, 2, 3]'<\/span>) <span class=\"hljs-keyword\">length<\/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| length |\n+<span class=\"hljs-comment\">--------+<\/span>\n|      3 |\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-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) Getting the length of an object<\/h3>\n\n\n\n<p>The following example uses the <code>JSON_LENGTH()<\/code> function to return the number of members in an object:<\/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_LENGTH(<span class=\"hljs-string\">'{\"name\": \"John\", \"age\": 22}'<\/span>) <span class=\"hljs-keyword\">length<\/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| length |\n+<span class=\"hljs-comment\">--------+<\/span>\n|      2 |\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) Getting the length of an object that has a nested array<\/h3>\n\n\n\n<p>The following example uses the <code>JSON_LENGTH()<\/code> function to return the number of members in an object that has a property which is an array. It doesn&#8217;t count the length of the nested array.<\/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_LENGTH(\n    <span class=\"hljs-string\">'{\"name\": \"John\", \"age\": 22, \"skills\":&#91;\"PHP\",\"MySQL\",\"JavaScript\"]}'<\/span>\n  ) <span class=\"hljs-keyword\">length<\/span>;<\/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| length |\n+<span class=\"hljs-comment\">--------+<\/span>\n|      3 |\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-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) Getting the length of a value specified by a path<\/h3>\n\n\n\n<p>The following example uses the <code>JSON_LENGTH()<\/code> function to return the number of elements of an array identified by a path:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" 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_LENGTH(\n    <span class=\"hljs-string\">'{\"name\": \"John\", \"age\": 22, \"skills\":&#91;\"PHP\",\"MySQL\"]}'<\/span>,\n    <span class=\"hljs-string\">'$.skills'<\/span>\n  ) <span class=\"hljs-keyword\">length<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><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-11\" 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| length |\n+<span class=\"hljs-comment\">--------+<\/span>\n|      2 |\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-11\"><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<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the <code>JSON_LENGTH()<\/code> function to determine the length of a JSON document, which is the number of elements in a JSON array or the number of key-value pairs in a JSON object.<\/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? 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Introduction to MySQL JSON_LENGTH() function The JSON_LENGTH() function returns the length of a JSON document. Here&#8217;s the syntax of the JSON_LENGTH() function: In this syntax: The JSON_LENGTH() function returns NULL if any argument [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":11973,"menu_order":24,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-12144","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_LENGTH() Function<\/title>\n<meta name=\"description\" content=\"In this tutorial, you will learn how to use the MySQL JSON_LENGTH() function to get the length of a JSON document.\" \/>\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_length\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta 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