{"id":12030,"date":"2023-11-02T08:08:51","date_gmt":"2023-11-02T15:08:51","guid":{"rendered":"https:\/\/www.mysqltutorial.org\/?page_id=12030"},"modified":"2023-11-02T08:12:38","modified_gmt":"2023-11-02T15:12:38","slug":"mysql-json_replace","status":"publish","type":"page","link":"https:\/\/www.mysqltutorial.org\/mysql-json\/mysql-json_replace\/","title":{"rendered":"MySQL JSON_REPLACE() Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the MySQL <code>JSON_REPLACE()<\/code> function to replace existing values in a JSON document and return the updated document.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to MySQL JSON_REPLACE() function<\/h2>\n\n\n\n<p>The <code>JSON_REPLACE()<\/code> function replaces existing values in a JSON document and returns the updated document.<\/p>\n\n\n\n<p>Here&#8217;s the syntax of the <code>JSON_REPLACE()<\/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_REPLACE(json_doc, path, value&#91;, path, val] ...)<\/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 replace data.<\/li>\n\n\n\n<li><code>path<\/code>: The\u00a0<a href=\"https:\/\/www.mysqltutorial.org\/mysql-json\/mysql-json-path\/\">JSON path<\/a>\u00a0that specifies the positions within the\u00a0<code>json_doc<\/code>\u00a0where you want to update the new value.<\/li>\n\n\n\n<li><code>value<\/code>: The value you want to update.<\/li>\n<\/ul>\n\n\n\n<p>The <code>JSON_REPLACE()<\/code> function returns the updated JSON document. It returns <code>NULL<\/code> if any argument is <code>NULL<\/code>.<\/p>\n\n\n\n<p>If you have multiple path\/value pairs, the function will process them one by one starting from the left. It uses the result of the first evaluation for the next path\/value pair. <\/p>\n\n\n\n<p>The function only overwrites the existing document value with a new value for an existing path in the document. If the path doesn&#8217;t exist, the function takes no effect.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">MySQL JSON_REPLACE() function examples<\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>JSON_REPLACE()<\/code> function.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1) Replacing an existing value<\/h3>\n\n\n\n<p>The following example uses the <code>JSON_REPLACE()<\/code> function to replace an existing value with a new value in a JSON document:<\/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_REPLACE(\n    <span class=\"hljs-string\">'{\"name\": \"Jane Doe\", \"age\": 22}'<\/span>, <span class=\"hljs-string\">'$.name'<\/span>, \n    <span class=\"hljs-string\">'Jane Smith'<\/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\": 22, \"name\": \"Jane Smith\"} |\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<h3 class=\"wp-block-heading\">2) Updating nested objects<\/h3>\n\n\n\n<p>The following example uses the <code>JSON_REPLACE()<\/code> function to update values within nested objects:<\/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_REPLACE(\n    <span class=\"hljs-string\">'{\"person\": {\"name\": \"John\", \"address\": {\"city\": \"New York\"}}}'<\/span>, \n    <span class=\"hljs-string\">'$.person.address.city'<\/span>, <span class=\"hljs-string\">'Los Angeles'<\/span>\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| {\"person\": {\"name\": \"John\", \"address\": {\"city\": \"Los Angeles\"}}} |\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<p>In this example, we use the <code>JSON_REPLACE()<\/code> function to update the city within the nested object.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3) Handling non-existing path example<\/h3>\n\n\n\n<p>If you attempt to replace a value at a path that doesn&#8217;t exist in the JSON document, the <code>JSON_REPLACE()<\/code> function will simply leave the document unchanged. For example:<\/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_REPLACE(\n    <span class=\"hljs-string\">'{\"name\": \"John\", \"age\": 22}'<\/span>, <span class=\"hljs-string\">'$.city'<\/span>, \n    <span class=\"hljs-string\">'London'<\/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| {\"age\": 22, \"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-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) Replacing with multiple path\/value pairs<\/h3>\n\n\n\n<p>The following example uses the <code>JSON_REPLACE()<\/code> function to update the name, and a city in a single operation:<\/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_REPLACE(\n    <span class=\"hljs-string\">'{\"name\": \"Jane Doe\", \"age\": 25, \"city\": \"New York\"}'<\/span>, \n    <span class=\"hljs-string\">'$.name'<\/span>, <span class=\"hljs-string\">'Jane Smith'<\/span>, <span class=\"hljs-string\">'$.age'<\/span>, <span class=\"hljs-number\">26<\/span>, <span class=\"hljs-string\">'$.city'<\/span>, \n    <span class=\"hljs-string\">'Los Angeles'<\/span>\n  ) <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\">+<span class=\"hljs-comment\">----------------------------------------------------------+<\/span>\n| result                                                   |\n+<span class=\"hljs-comment\">----------------------------------------------------------+<\/span>\n| {\"age\": 26, \"city\": \"Los Angeles\", \"name\": \"Jane Smith\"} |\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<p>In this example, the <code>JSON_REPLACE()<\/code> function replaces the name first, and uses the updated document to replace the age, and uses the modified document to replace the city.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the MySQL <code>JSON_REPLACE()<\/code> function to replace existing values in a JSON document.<\/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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