{"id":3464,"date":"2024-03-12T15:29:38","date_gmt":"2024-03-12T08:29:38","guid":{"rendered":"https:\/\/www.sqlservertutorial.net\/?page_id=3464"},"modified":"2024-03-14T14:52:45","modified_gmt":"2024-03-14T07:52:45","slug":"sql-server-json","status":"publish","type":"page","link":"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-json\/","title":{"rendered":"SQL Server JSON"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn about SQL Server JSON and how to store JSON data, as well as retrieve JSON values.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='what-is-json'>What is JSON <a href=\"#what-is-json\" class=\"anchor\" id=\"what-is-json\" title=\"Anchor for What is JSON\">#<\/a><\/h2>\n\n\n\n<p>JSON stands for JavaScript Object Notation. <\/p>\n\n\n\n<p>JSON is a lightweight data-interchange format that is easy for humans to read and simple for computers to parse.<\/p>\n\n\n\n<p>JSON is often used to exchange data between servers and web applications. It is also commonly used for configuration files.<\/p>\n\n\n\n<p>JSON is built based on two main data structures: object and array.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='objects'>Objects <a href=\"#objects\" class=\"anchor\" id=\"objects\" title=\"Anchor for Objects\">#<\/a><\/h3>\n\n\n\n<p>An object is an unordered collection of key-value pairs enclosed in curly braces <code>{}<\/code>. Each pair consists of a key surrounded by double quotes (<code>\"\"<\/code>), a colon <code>:<\/code>, and a value.<\/p>\n\n\n\n<p>For example, the following shows a JSON object that represents the information of a person:<\/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\">{\"name\": \"John\", \"age\": 22 }<\/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>The <code>person<\/code> object has two keys <code>name<\/code> and <code>age<\/code> with the corresponding values <code>\"John\"<\/code> and <code>22<\/code>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='arrays'>Arrays <a href=\"#arrays\" class=\"anchor\" id=\"arrays\" title=\"Anchor for Arrays\">#<\/a><\/h3>\n\n\n\n<p>An array is an ordered list of values enclosed in square brackets <code>[]<\/code>. The items in the array may have different types, including arrays and objects.<\/p>\n\n\n\n<p>For example, the following is a JSON array of a number, a string, and a 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\">&#91;1, \"person\", {\"name\": \"John\", \"age\": 22}]<\/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<h3 class=\"wp-block-heading\" id='json-data-types'>JSON data types <a href=\"#json-data-types\" class=\"anchor\" id=\"json-data-types\" title=\"Anchor for JSON data types\">#<\/a><\/h3>\n\n\n\n<p>JSON offers some data types, including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>String: a sequence of characters enclosed in double quotes (<code>\"\"<\/code>).<\/li>\n\n\n\n<li>Number: an integer or floating-point number.<\/li>\n\n\n\n<li>Boolean: <code>true <\/code>or <code>false<\/code>.<\/li>\n\n\n\n<li>Null: contains one <code>null<\/code> value.<\/li>\n\n\n\n<li>Array: an ordered list of values enclosed in square brackets (<code>[]<\/code>).<\/li>\n\n\n\n<li>Object: An unordered list of key-value pairs enclosed in curly braces (<code>{}<\/code>).<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id='validating-json'>Validating JSON <a href=\"#validating-json\" class=\"anchor\" id=\"validating-json\" title=\"Anchor for Validating JSON\">#<\/a><\/h2>\n\n\n\n<p>To check if a string is valid JSON or not, you use the <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-json-functions\/sql-server-isjson\/\">ISJSON()<\/a> function:<\/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\">ISJSON(json_string)<\/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 <code>ISJSON()<\/code> function returns 1 if the <code>json_string<\/code> is a valid JSON or 0 otherwise.<\/p>\n\n\n\n<p>For example, the following statement uses the <code>ISJSON()<\/code> function to validate a JSON string:<\/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\">'{\"name\": \"Joe\"}'<\/span>) is_valid_json;<\/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\"><span><code class=\"hljs\">is_valid_json\r\n-------------\r\n1<\/code><\/span><\/pre>\n\n\n<p>It returns 1 because the JSON string is valid. However, the following statement returns 0 because the JSON string is not valid:<\/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-keyword\">SELECT<\/span> ISJSON(<span class=\"hljs-string\">'&#91;1,2,3,]'<\/span>) is_valid_json;<\/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>Output:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">is_valid_json\r\n-------------\r\n0<\/code><\/span><\/pre>\n\n\n<p>The JSON string has a comma after the number 3, which is not valid.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='storing-json-data-in-the-database'>Storing JSON data in the database <a href=\"#storing-json-data-in-the-database\" class=\"anchor\" id=\"storing-json-data-in-the-database\" title=\"Anchor for Storing JSON data in the database\">#<\/a><\/h2>\n\n\n\n<p>SQL Server does not offer a built-in JSON type like <a href=\"https:\/\/www.postgresqltutorial.com\/postgresql-tutorial\/postgresql-json\/\" target=\"_blank\" rel=\"noreferrer noopener\">PostgreSQL<\/a> and other database systems. Instead, it uses the <code><a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-nvarchar\/\">NVARCHAR<\/a><\/code> type to store JSON data. Let&#8217;s take an example of storing JSON data in a table.<\/p>\n\n\n\n<p>First, <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-create-table\/\">create a table<\/a> called <code>employees<\/code> to store the employee data:<\/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\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> employees(\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   info <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-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>The <code>employees<\/code> table has two columns: <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>id<\/code>: This is the primary key column. <\/li>\n\n\n\n<li><code>info<\/code> : This is an <code>NVARCHAR<\/code> column that will store JSON data.<\/li>\n<\/ul>\n\n\n\n<p>Second, <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-insert-multiple-rows\/\">insert two rows<\/a> into the <code>employees<\/code> table:<\/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-keyword\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span> employees (info)\n<span class=\"hljs-keyword\">VALUES<\/span> \n    (<span class=\"hljs-string\">'{\"name\": \"John\", \"age\": 35, \"dateOfBirth\": \"1989-05-15\", \"skills\": &#91;\"JavaScript\", \"SQL\", \"Python\"], \"address\": {\"street\": \"123 Main St\", \"city\": \"New York\", \"state\": \"NY\", \"country\": \"USA\"}}'<\/span>),\n    (<span class=\"hljs-string\">'{\"name\": \"Alice\", \"age\": 28, \"dateOfBirth\": \"1996-10-22\", \"skills\": &#91;\"Java\", \"C#\", \"HTML\/CSS\"], \"address\": {\"street\": \"456 Elm St\", \"city\": \"Los Angeles\", \"state\": \"CA\", \"country\": \"USA\"}}'<\/span>);<\/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<h2 class=\"wp-block-heading\" id='extracting-json-data-from-sql-server'>Extracting JSON data from SQL Server <a href=\"#extracting-json-data-from-sql-server\" class=\"anchor\" id=\"extracting-json-data-from-sql-server\" title=\"Anchor for Extracting JSON data from SQL Server\">#<\/a><\/h2>\n\n\n\n<p>To extract a scalar value from a JSON string, you use the <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-json-functions\/sql-server-json_value\/\">JSON_VALUE()<\/a> function:<\/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\">JSON_VALUE(json_string, json_path)<\/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>The <code>JSON_VALUE()<\/code> function has two parameters:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>json_string<\/code> is JSON data.<\/li>\n\n\n\n<li><code>json_path<\/code> is a <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-json-functions\/sql-server-json-path-expressions\/\">JSON path<\/a> that specifies the value from the JSON string to extract. A JSON path is a way to locate an element in a JSON document.<\/li>\n<\/ul>\n\n\n\n<p>For example, the following statement extracts the <code>name<\/code>, <code>age<\/code>, and <code>dateOfBirth<\/code> from the JSON data stored in the <code>info<\/code> column of the <code>employees<\/code> table:<\/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-keyword\">SELECT<\/span> \n    JSON_VALUE(info, <span class=\"hljs-string\">'$.name'<\/span>) <span class=\"hljs-keyword\">AS<\/span> <span class=\"hljs-keyword\">Name<\/span>,\n    JSON_VALUE(info, <span class=\"hljs-string\">'$.age'<\/span>) <span class=\"hljs-keyword\">AS<\/span> Age,\n    JSON_VALUE(info, <span class=\"hljs-string\">'$.dateOfBirth'<\/span>) <span class=\"hljs-keyword\">AS<\/span> DateOfBirth\n<span class=\"hljs-keyword\">FROM<\/span> \n    employees;<\/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>Output:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">Name  | Age | DateOfBirth\r\n--------------------------\r\nJohn  | 35  | 1989-05-15\r\nAlice | 28  | 1996-10-22<\/code><\/span><\/pre>\n\n\n<p>To extract a JSON object or array from a JSON document, you can use the <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-json-functions\/sql-server-json_query\/\">JSON_QUERY()<\/a> function:<\/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\">JSON_QUERY(json_string, json_path);<\/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>For example, the following statement uses the <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-json-functions\/sql-server-json_query\/\">JSON_QUERY()<\/a> function to extract the skills from the info column of the <code>employees<\/code> table:<\/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-keyword\">SELECT<\/span> \n  JSON_QUERY(info, <span class=\"hljs-string\">'$.skills'<\/span>) skills \n<span class=\"hljs-keyword\">FROM<\/span> \n  employees;<\/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<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-12\" data-shcb-language-name=\"CSS\" data-shcb-language-slug=\"css\"><span><code class=\"hljs language-css\"><span class=\"hljs-selector-tag\">skills<\/span>\r\n<span class=\"hljs-selector-tag\">-------------------------------<\/span>\r\n<span class=\"hljs-selector-attr\">&#91;<span class=\"hljs-string\">\"JavaScript\"<\/span>, <span class=\"hljs-string\">\"SQL\"<\/span>, <span class=\"hljs-string\">\"Python\"<\/span>]<\/span>\r\n<span class=\"hljs-selector-attr\">&#91;<span class=\"hljs-string\">\"Java\"<\/span>, <span class=\"hljs-string\">\"C#\"<\/span>, <span class=\"hljs-string\">\"HTML\/CSS\"<\/span>]<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">CSS<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">css<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this example, we use the <code>JSON_QUERY()<\/code> function to extract the <code>skills<\/code> array from JSON documents stored in the <code>info<\/code> column.<\/p>\n\n\n\n<p>SQL server offers more useful <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-json-functions\/\">JSON functions<\/a>, allowing you to work with JSON data more effectively.<\/p>\n\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>NVARCHAR(MAX)<\/code> data type to represent JSON data in SQL Server.<\/li>\n\n\n\n<li>Use the <code>ISJSON()<\/code> function to check if a string is a valid JSON or not. <\/li>\n\n\n\n<li>Use the <code>JSON_VALUE()<\/code> function to extract scalar values from a JSON string.<\/li>\n\n\n\n<li>Use the <code>JSON_QUERY()<\/code> function to extract JSON objects or arrays from a JSON string.<\/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=\"3464\"\n\t\t\t\tdata-post-url=\"https:\/\/www.sqlservertutorial.net\/sql-server-basics\/sql-server-json\/\"\n\t\t\t\tdata-post-title=\"SQL Server JSON\"\n\t\t\t\tdata-response=\"1\"\n\t\t\t\tclass=\"wth-btn-rounded 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