--- title: Testing JSON-LD Like an API: 7 Checks Before Your Next... description: JSON-LD should be treated as a maintained output of the application, with its own data source, validation rules, and regression tests, not a static copy of... canonical: https://daily.dev/posts/testing-json-ld-like-an-api-7-checks-before-your-next-release-ckcvcpamz twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Testing JSON-LD Like an API: 7 Checks Before Your Next Release | daily.dev og:description: JSON-LD should be treated as a maintained output of the application, with its own data source, validation rules, and regression tests, not a static copy of... og:url: https://daily.dev/posts/testing-json-ld-like-an-api-7-checks-before-your-next-release-ckcvcpamz og:image: https://api.daily.dev/og/posts/cKcvCpaMz.png og:image:alt: Testing JSON-LD Like an API: 7 Checks Before Your Next Release og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Testing JSON-LD Like an API: 7 Checks Before Your Next Release **[SitePoint](https://daily.dev/sources/sitepoint)** · 7 min read · 2 upvotes · 0 comments ## Summary JSON-LD should be treated as a maintained output of the application, with its own data source, validation rules, and regression tests, not a static copy of page content. A builder function generates article markup from the same published record used by the visible page, keeping the '@id' stable across edits. A serialization helper escapes '<' characters so a headline containing '' can't break out of the embedded script tag. Tests run with 'node --test' check that edits preserve identity, that missing fields aren't invented, and that script-like strings round-trip safely. Browser-level checks should then compare the rendered page against its JSON-LD to catch mismatches like stale headlines or conflicting author data from old plugins. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How do I safely embed JSON-LD in a script tag without breaking out of it? Replace literal '<' characters with '\u003c' before inserting the JSON string into the script element. JSON.stringify already escapes quotes and backslashes, but it does not prevent a value containing '' from terminating the element at the HTML-parser level. A helper like 'serializeJsonLd' applies this replacement so embedded closing-script sequences can't appear in the output. _Developers embedding structured data safely compare implementation approaches like this on daily.dev._ ### How should I test that my JSON-LD stays in sync with page content after an editorial change? Write unit tests that rebuild the schema after a content change and assert the article's '@id' stays stable while fields like headline update correctly, then add a browser-level check comparing the rendered page's visible heading, byline, and dates against the JSON-LD entity by its '@id'. Node's built-in test runner, run via 'node --test', works for the unit-level checks. _Teams building regression tests for structured data track testing patterns like this via daily.dev._ ### Should dateModified be updated on every deployment? No, dateModified should not be set to the current time on every deployment. A CSS update or infrastructure rebuild does not necessarily mean the article content changed, so the timestamp should be read from the editorial record instead of generated automatically at build time. _Developers maintaining accurate publishing metadata follow practical guidance like this on daily.dev._ ## Similar posts on daily.dev - [How to Add Structured Data \(JSON-LD\) to a Next.js Site and Validate It](https://daily.dev/posts/how-to-add-structured-data-json-ld-to-a-next-js-site-and-validate-it-qizd73yzl) · freeCodeCamp · 4 upvotes · 0 comments - [4 things you should be doing with JSON](https://daily.dev/posts/4-things-you-should-be-doing-with-json-fho46ojyc) · All Things Open · 1 upvotes · 0 comments - [Schema Markup for Security Content: The Structured Data That Actually Gets Cybersecurity Vendors Cited by AI](https://daily.dev/posts/schema-markup-for-security-content-the-structured-data-that-actually-gets-cybersecurity-vendors-cit-vgdgqzqfm) · Security Boulevard · 0 upvotes · 0 comments - [Treat SEO Metadata as an Application Contract in JavaScript SaaS Apps](https://daily.dev/posts/treat-seo-metadata-as-an-application-contract-in-javascript-saas-apps-ekup3av0m) · SitePoint · 0 upvotes · 1 comments - [How to Test an API Without a Frontend](https://daily.dev/posts/how-to-test-an-api-without-a-frontend-5phbkfhlw) · Bruno Blog · 16 upvotes · 3 comments --- Tags: [#javascript](https://daily.dev/tags/javascript), [#testing](https://daily.dev/tags/testing), [#seo](https://daily.dev/tags/seo) [View this post on daily.dev](https://daily.dev/posts/testing-json-ld-like-an-api-7-checks-before-your-next-release-ckcvcpamz) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Testing JSON-LD Like an API: 7 Checks Before Your Next Release","url":"https://daily.dev/posts/testing-json-ld-like-an-api-7-checks-before-your-next-release-ckcvcpamz","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/testing-json-ld-like-an-api-7-checks-before-your-next-release-ckcvcpamz"},"datePublished":"2026-10-29T16:43:10.604Z","dateModified":"2026-10-29T16:45:15.712Z","description":"JSON-LD should be treated as a maintained output of the application, with its own data source, validation rules, and regression tests, not a static copy of...","image":"https://media.daily.dev/image/upload/s--2-1xRawN--/f_auto/v1722860399/public/Placeholder%2011","thumbnailUrl":"https://media.daily.dev/image/upload/s--2-1xRawN--/f_auto/v1722860399/public/Placeholder%2011","isAccessibleForFree":true,"articleSection":"SitePoint","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"SitePoint","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/sitepoint","url":"https://daily.dev/sources/sitepoint"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/testing-json-ld-like-an-api-7-checks-before-your-next-release-ckcvcpamz","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":2},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"javascript,testing,seo","timeRequired":"PT7M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"SitePoint","item":"https://daily.dev/sources/sitepoint"},{"@type":"ListItem","position":3,"name":"Testing JSON-LD Like an API: 7 Checks Before Your Next Release"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/testing-json-ld-like-an-api-7-checks-before-your-next-release-ckcvcpamz#faq","mainEntity":[{"@type":"Question","name":"How do I safely embed JSON-LD in a script tag without breaking out of it?","acceptedAnswer":{"@type":"Answer","text":"Replace literal '\u003c' characters with '\\u003c' before inserting the JSON string into the script element. 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