{"id":3499,"date":"2024-03-12T21:58:26","date_gmt":"2024-03-12T14:58:26","guid":{"rendered":"https:\/\/www.sqlservertutorial.net\/?page_id=3499"},"modified":"2024-03-12T21:58:35","modified_gmt":"2024-03-12T14:58:35","slug":"sql-server-isjson","status":"publish","type":"page","link":"https:\/\/www.sqlservertutorial.net\/sql-server-json-functions\/sql-server-isjson\/","title":{"rendered":"SQL Server ISJSON() Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the SQL Server <code>ISJSON()<\/code> function to check if a string contains valid JSON.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='introduction-to-the-sql-server-isjson-function'>Introduction to the SQL Server ISJSON() function <a href=\"#introduction-to-the-sql-server-isjson-function\" class=\"anchor\" id=\"introduction-to-the-sql-server-isjson-function\" title=\"Anchor for Introduction to the SQL Server ISJSON() function\">#<\/a><\/h2>\n\n\n\n<p>The <code>ISJSON()<\/code> function checks if a string contains valid <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-json-functions\/\">JSON<\/a>. <\/p>\n\n\n\n<p>Here&#8217;s the syntax of the <code>ISJSON()<\/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\">ISJSON ( expression &#91;, json_type_constraint] )<\/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>expression<\/code> is a string to check, which can be a literal string, a variable, or a table column.<\/li>\n\n\n\n<li><code>json_type_constraint<\/code> is the JSON type to check the expression. The valid values of the <code>json_type_constraint<\/code> are <code>VALUE<\/code>, <code>ARRAY<\/code>, <code>OBJECT<\/code>, or <code>SCALAR<\/code>. The <code>json_type_constraint<\/code> is optional. If you omit the <code>json_type_constraint<\/code>, the function checks if the input is a JSON object or array.<\/li>\n<\/ul>\n\n\n\n<p>The following table shows the detailed meaning of each value:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Value<\/th><th>Meaning<\/th><\/tr><\/thead><tbody><tr><td><code>VALUE<\/code><\/td><td>Check if the input string is a valid JSON value, which can be a JSON object, array, number, string, bool, or null.<\/td><\/tr><tr><td><code>ARRAY<\/code><\/td><td>Check if the input string is a valid JSON array.<\/td><\/tr><tr><td><code>OBJECT<\/code><\/td><td>Check if the input string is a valid JSON object.<\/td><\/tr><tr><td><code>SCALAR<\/code><\/td><td>Check if the input string is a scalar value.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>The <code>ISJSON()<\/code> function returns 1 if the string contains valid JSON or 0 otherwise. If the expression is null the <code>ISJSON()<\/code> function returns null.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='sql-server-isjson-function-examples'>SQL Server ISJSON() function examples <a href=\"#sql-server-isjson-function-examples\" class=\"anchor\" id=\"sql-server-isjson-function-examples\" title=\"Anchor for SQL Server ISJSON() function examples\">#<\/a><\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>ISJSON()<\/code> function.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='1-basic-sql-server-isjson-function-examples'>1) Basic SQL Server ISJSON() function examples <a href=\"#1-basic-sql-server-isjson-function-examples\" class=\"anchor\" id=\"1-basic-sql-server-isjson-function-examples\" title=\"Anchor for 1) Basic SQL Server ISJSON() function examples\">#<\/a><\/h3>\n\n\n\n<p>The following example uses the <code>ISJSON()<\/code> function to check if a string contains a valid JSON object:<\/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> ISJSON(<span class=\"hljs-string\">'{}'<\/span>) <span class=\"hljs-keyword\">AS<\/span> <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\">result\n<span class=\"hljs-comment\">------<\/span>\n1<\/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 following example uses the <code>ISJSON()<\/code> function to determine where a string contains a valid JSON 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> ISJSON(<span class=\"hljs-string\">'&#91;]'<\/span>) <span class=\"hljs-keyword\">AS<\/span> <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\">result\n<span class=\"hljs-comment\">------<\/span>\n1<\/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<p>The following statement returns 0 because the string does not contain valid JSON:<\/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> ISJSON(<span class=\"hljs-string\">'Hi'<\/span>) <span class=\"hljs-keyword\">AS<\/span> <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\">result\n<span class=\"hljs-comment\">------<\/span>\n0<\/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<p>To check if the string &#8220;Hi&#8221; is a JSON scalar value, you need to use the <code>json_constraint_type<\/code> <code>SCALAR<\/code> as follows:<\/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> ISJSON(<span class=\"hljs-string\">'\"Hi\"'<\/span>,SCALAR) <span class=\"hljs-keyword\">AS<\/span> <span class=\"hljs-keyword\">result<\/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\">result\n<span class=\"hljs-comment\">------<\/span>\n1\n(1 row)<\/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<p>The following example returns 0 because the key of the JSON object is surrounded by single quotes:<\/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> ISJSON(<span class=\"hljs-string\">'{''age'': 10}'<\/span>) <span class=\"hljs-keyword\">result<\/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\">result\n<span class=\"hljs-comment\">------<\/span>\n0<\/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<h3 class=\"wp-block-heading\" id='2-using-sql-server-isjson-function-with-table-data'>2) Using SQL Server ISJSON() function with table data <a href=\"#2-using-sql-server-isjson-function-with-table-data\" class=\"anchor\" id=\"2-using-sql-server-isjson-function-with-table-data\" title=\"Anchor for 2) Using SQL Server ISJSON() function with table data\">#<\/a><\/h3>\n\n\n\n<p>First, <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-create-table\/\">create a new table<\/a> called <code>settings<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-12\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> <span class=\"hljs-keyword\">settings<\/span>(\n   <span class=\"hljs-keyword\">id<\/span> <span class=\"hljs-built_in\">INT<\/span> <span class=\"hljs-keyword\">IDENTITY<\/span> PRIMARY <span class=\"hljs-keyword\">KEY<\/span>,\n   options <span class=\"hljs-keyword\">NVARCHAR<\/span>(<span class=\"hljs-keyword\">MAX<\/span>) <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>\n);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><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 <code>options<\/code> column will store JSON data.<\/p>\n\n\n\n<p>Second, <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-insert-multiple-rows\/\">insert some rows<\/a> into the <code>settings<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-13\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span> <span class=\"hljs-keyword\">settings<\/span> (options)\n<span class=\"hljs-keyword\">VALUES<\/span>\n  (<span class=\"hljs-string\">'{\"theme\": \"dark\", \"fontSize\": 14, \"language\": \"en\"}'<\/span>),\n  (<span class=\"hljs-string\">'{\"theme\": \"light\", \"fontSize\": 12, \"language\": \"fr\"}'<\/span>),\n  (<span class=\"hljs-string\">'{\"theme\": \"auto, \"fontSize\": 16, \"language\": \"de\"}'<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-13\"><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>Third, validate the JSON data in the <code>options<\/code> column of the <code>settings<\/code> table using the <code>ISJSON()<\/code> function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-14\" 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  <span class=\"hljs-keyword\">id<\/span>, \n  options, \n  ISJSON(options) valid \n<span class=\"hljs-keyword\">FROM<\/span> \n  <span class=\"hljs-keyword\">settings<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-14\"><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-15\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">id | options                                              | valid\n<span class=\"hljs-comment\">------------------------------------------------------------------<\/span>\n1  | {\"theme\": \"dark\", \"fontSize\": 14, \"language\": \"en\"}  | 1\n2  | {\"theme\": \"light\", \"fontSize\": 12, \"language\": \"fr\"} | 1\n3  | {\"theme\": \"auto, \"fontSize\": 16, \"language\": \"de\"}   | 0<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-15\"><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\" id='summary'>Summary <a href=\"#summary\" class=\"anchor\" id=\"summary\" title=\"Anchor for Summary\">#<\/a><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the <code>ISJSON()<\/code> function to check where a string contains valid JSON.<\/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 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