{"id":3333,"date":"2024-04-27T08:59:35","date_gmt":"2024-04-27T01:59:35","guid":{"rendered":"https:\/\/www.sqlitetutorial.net\/?page_id=3333"},"modified":"2024-04-27T08:59:37","modified_gmt":"2024-04-27T01:59:37","slug":"sqlite-json_valid-function","status":"publish","type":"page","link":"https:\/\/www.sqlitetutorial.net\/sqlite-json-functions\/sqlite-json_valid-function\/","title":{"rendered":"SQLite json_valid() Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the SQLite <code>json_valid()<\/code> function to check if a text string represents valid JSON data.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to the json_valid() function<\/h2>\n\n\n\n<p>The <code>json_valid()<\/code> function checks whether a string contains valid <a href=\"https:\/\/www.sqlitetutorial.net\/sqlite-json\/\">JSON<\/a>.<\/p>\n\n\n\n<p>Here&#8217;s the syntax of the <code>json_valid()<\/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_valid(json_value)<\/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_value<\/code> is a string you want to check for a valid JSON format.<\/li>\n<\/ul>\n\n\n\n<p>The <code>json_valid()<\/code> function returns 1 if the <code>json_value<\/code> is valid JSON, otherwise, it returns 0. The <code>json_valid()<\/code> function returns <code>NULL<\/code> if the input string is <code>NULL<\/code>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SQLite json_valid() function examples<\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>json_valid()<\/code> function.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1) Checking a valid JSON string<\/h3>\n\n\n\n<p>The following example uses the <code>json_valid()<\/code> function to check if a string is a valid JSON:<\/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> json_valid(<span class=\"hljs-string\">'{\"name\": \"Bob\"}'<\/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 <code>json_valid()<\/code> function returns 1 because the json string is valid.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2) Checking an invalid JSON string<\/h3>\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> json_valid(<span class=\"hljs-string\">'{age: 25}'<\/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>\n0<\/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>This example returns 0 because the input json is invalid.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3) Using json_valid() function with table data<\/h3>\n\n\n\n<p>First, <a href=\"https:\/\/www.sqlitetutorial.net\/sqlite-create-table\/\">create a table<\/a> called <code>persons<\/code>:<\/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> persons(\n    <span class=\"hljs-keyword\">id<\/span> <span class=\"hljs-built_in\">INTEGER<\/span> PRIMARY <span class=\"hljs-keyword\">KEY<\/span>,\n    <span class=\"hljs-keyword\">data<\/span> <span class=\"hljs-built_in\">TEXT<\/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>Second, <a href=\"https:\/\/www.sqlitetutorial.net\/sqlite-insert\/\">insert rows<\/a> into the <code>persons<\/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> persons(<span class=\"hljs-keyword\">data<\/span>) \n<span class=\"hljs-keyword\">VALUES<\/span> \n   (<span class=\"hljs-string\">'{\"name\": \"Alice\", \"age\": 30}'<\/span>),\n   (<span class=\"hljs-string\">'{\"name\": \"Bob\", \"city\": \"New York\"}'<\/span>),\n   (<span class=\"hljs-string\">'invalid_json'<\/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<p>Third, validate json data using the <code>json_valid()<\/code> 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\"><span class=\"hljs-keyword\">SELECT<\/span> <span class=\"hljs-keyword\">id<\/span>, <span class=\"hljs-keyword\">data<\/span>,  json_valid(<span class=\"hljs-keyword\">data<\/span>) <span class=\"hljs-keyword\">AS<\/span> is_valid\n<span class=\"hljs-keyword\">FROM<\/span> persons;<\/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\">id  data                                 is_valid\n<span class=\"hljs-comment\">--  -----------------------------------  --------<\/span>\n1   {\"name\": \"Alice\", \"age\": 30}         1\n2   {\"name\": \"Bob\", \"city\": \"New York\"}  1\n3   invalid_json                         0<\/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<h2 class=\"wp-block-heading\">Defining well-formed JSON<\/h2>\n\n\n\n<p><\/p>\n\n\n\n<p>Starting from the SQLite version <code>3.45.0<\/code>, the <code>json_valid()<\/code> function has a second optional argument that defines what it means by &#8220;well-formed&#8221;.<\/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_valid(json_value, flags );<\/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>In this syntax:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>json_value<\/code> is a string that you want to check for valid JSON.<\/li>\n\n\n\n<li><code>flags<\/code> is an integer bitmask that specifies what constitutes &#8220;well-form&#8221; JSON.<\/li>\n<\/ul>\n\n\n\n<p>SQLite defines the following bits of the flags:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>0x01 &#8211; Check the <code>json_value<\/code> against the canonical <code>RFC<\/code>-8259 JSON, without any extensions.<\/li>\n\n\n\n<li>0x02 &#8211; Check the <code>json_value<\/code> against the <code>JSON5<\/code> extensions.<\/li>\n\n\n\n<li>0x04 &#8211; If <code>json_value<\/code> is a <code>BLOB<\/code> that <strong>superficially <\/strong>appears to be SQLite&#8217;s internal binary&nbsp; representation of JSON (JSONB) <\/li>\n\n\n\n<li>0x08 &#8211; If <code>json_value<\/code> is a <code>BLOB<\/code> that <strong>strictly<\/strong> appears to be SQLite&#8217;s internal binary&nbsp;representation of JSON (JSONB) <\/li>\n<\/ul>\n\n\n\n<p>By combining the above bits, you can form some useful flags. For example, <code>flags<\/code> 6 checks if the <code>json_value<\/code> is <code>JSON5<\/code> text or JSONB.<\/p>\n\n\n\n<p>The following example uses the <code>json_valid()<\/code> function to check if a JSON value is <code>JSON5<\/code> text or JSONB:<\/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> json_valid(<span class=\"hljs-string\">'{\"name\": \"Joe\"}'<\/span>, <span class=\"hljs-number\">6<\/span>) valid;<\/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=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">valid\n<span class=\"hljs-comment\">-----<\/span>\n1<\/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<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the <code>json_valid()<\/code> function to check whether a text string represents valid JSON data.<\/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=\"3333\"\n\t\t\t\tdata-post-url=\"https:\/\/www.sqlitetutorial.net\/sqlite-json-functions\/sqlite-json_valid-function\/\"\n\t\t\t\tdata-post-title=\"SQLite json_valid() Function\"\n\t\t\t\tdata-response=\"1\"\n\t\t\t\tclass=\"wth-btn-rounded wth-yes-btn\"\n\t\t\t>\n\t\t\t\t<svg\n\t\t\t\t\txmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n\t\t\t\t\tviewBox=\"0 0 24 24\"\n\t\t\t\t\tfill=\"none\"\n\t\t\t\t\tstroke=\"currentColor\"\n\t\t\t\t\tstroke-width=\"2\"\n\t\t\t\t\tstroke-linecap=\"round\"\n\t\t\t\t\tstroke-linejoin=\"round\"\n\t\t\t\t\tclass=\"feather feather-thumbs-up block w-full h-full\"\n\t\t\t\t>\n\t\t\t\t\t<path\n\t\t\t\t\t\td=\"M14 9V5a3 3 0 0 0-3-3l-4 9v11h11.28a2 2 0 0 0 2-1.7l1.38-9a2 2 0 0 0-2-2.3zM7 22H4a2 2 0 0 1-2-2v-7a2 2 0 0 1 2-2h3\"\n\t\t\t\t\t><\/path>\n\t\t\t\t<\/svg>\n\t\t\t\t<span class=\"sr-only\"> Yes <\/span>\n\t\t\t<\/button>\n\n\t\t\t<button\n\t\t\t\tdata-response=\"0\"\n\t\t\t\tdata-post=\"3333\"\n\t\t\t\tdata-post-url=\"https:\/\/www.sqlitetutorial.net\/sqlite-json-functions\/sqlite-json_valid-function\/\"\n\t\t\t\tdata-post-title=\"SQLite json_valid() Function\"\n\t\t\t\tclass=\"wth-btn-rounded wth-no-btn\"\n\t\t\t>\n\t\t\t\t<svg\n\t\t\t\t\txmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n\t\t\t\t\tviewBox=\"0 0 24 24\"\n\t\t\t\t\tfill=\"none\"\n\t\t\t\t\tstroke=\"currentColor\"\n\t\t\t\t\tstroke-width=\"2\"\n\t\t\t\t\tstroke-linecap=\"round\"\n\t\t\t\t\tstroke-linejoin=\"round\"\n\t\t\t\t>\n\t\t\t\t\t<path\n\t\t\t\t\t\td=\"M10 15v4a3 3 0 0 0 3 3l4-9V2H5.72a2 2 0 0 0-2 1.7l-1.38 9a2 2 0 0 0 2 2.3zm7-13h2.67A2.31 2.31 0 0 1 22 4v7a2.31 2.31 0 0 1-2.33 2H17\"\n\t\t\t\t\t><\/path>\n\t\t\t\t<\/svg>\n\t\t\t\t<span class=\"sr-only\"> No <\/span>\n\t\t\t<\/button>\n\t\t<\/div>\n\t<\/header>\n\n\t<div class=\"wth-form hidden\">\n\t\t<div class=\"wth-form-wrapper\">\n\t\t\t<div class=\"wth-title\"><\/div>\n\t\t\t\n\t\t\t<textarea class=\"wth-message\"><\/textarea>\n\n\t\t\t<button class=\"btn btn-primary wth-btn-submit\">Send<\/button>\n\t\t\t<button class=\"btn wth-btn-cancel\">Cancel<\/button>\n\t\t\n\t\t<\/div>\n\t<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Summary: in this tutorial, you will learn how to use the SQLite json_valid() function to check if a text string represents valid JSON data. Introduction to the json_valid() function The json_valid() function checks whether a string contains valid JSON. Here&#8217;s the syntax of the json_valid() function: In this syntax: The json_valid() function returns 1 if [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3255,"menu_order":2,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3333","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SQLite json_valid() Function<\/title>\n<meta name=\"description\" content=\"In this tutorial, you will learn how to use the SQLite() json_valid() function to check if a text string represents valid JSON data.\" \/>\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.sqlitetutorial.net\/sqlite-json-functions\/sqlite-json_valid-function\/\" \/>\n<meta property=\"og:locale\" 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