Schema Markup Generator: Create JSON-LD Without Writing Code
Last Updated: February 25, 2026 · 12 min read
A schema markup generator lets you fill in a form and get valid JSON-LD output without touching any code. You copy the output into your page and immediately become eligible for rich results. This guide covers the best free generators, how to use them correctly, and — critically — how to validate the output before deploying so you don't waste Google's crawl budget on broken schema.
⚡ The fastest workflow
Generate → paste into SchemaValidator.org → fix any errors → deploy → check Google Rich Results Test. Total time: under 10 minutes for most page types.
1. Best Schema Markup Generators (2026)
SchemaValidator.org
Free📌 Best for: Validation + generation in one place
ArticleProductLocalBusinessFAQRecipeEventPersonOrganizationPros
✓ Instant validation of generated output
✓ No login required
✓ Supports URL + code testing
Cons
− Focused on validation workflow
Google Rich Results Test
Freehttps://search.google.com/test/rich-results
📌 Best for: Previewing how output will look in Google Search
All Google-supported typesPros
✓ Visual rich result preview
✓ Direct Google feedback
Cons
− Test only — not a generator
− Needs public URL
Merkle Schema Markup Generator
Freehttps://technicalseo.com/tools/schema-markup-generator/
📌 Best for: Beginners — form-based, no coding needed
ArticleProductFAQRecipeEventLocalBusinessHowToBreadcrumbListPros
✓ Simple form UI
✓ Outputs clean JSON-LD
✓ Free
Cons
− Limited to common types
− No real-time validation
Yoast SEO (WordPress)
https://yoast.com/wordpress/plugins/seo/
📌 Best for: WordPress sites wanting automated schema
ArticleProductRecipeFAQLocalBusinessPersonOrganizationPros
✓ Auto-generates schema from post data
✓ Handles sitewide entity graph
✓ Free tier available
Cons
− WordPress only
− Premium for all types
2. How to Use a Schema Generator: Step-By-Step
Choose your schema type
Identify the primary content type of the page (Article, Product, Recipe, LocalBusiness, Event, FAQ, HowTo). If a page serves multiple purposes — e.g. a product page with reviews — you will add multiple schema blocks.
Fill in the form fields
Complete all required fields (marked with *) and as many recommended fields as you can. The more properties you fill in, the richer the eligible result. Required fields only = bare eligibility. Full fields = maximum rich result display.
Copy the JSON-LD output
Copy the generated JSON-LD code. Most generators output a complete <script type="application/ld+json"> block. Do not modify the structure — only change placeholder values you missed.
Validate before deploying
Paste the code into SchemaValidator.org or the Google Rich Results Test. Fix every error (red) before deploying. Warnings (amber) are best-practice suggestions — address them when possible.
Add to your page
Paste the <script> block into your page's <head> or just before </body>. In Next.js, add it via dangerouslySetInnerHTML in a server component. In WordPress, use a header injection plugin or your theme's functions.php.
Confirm with Google Rich Results Test
Once live, paste your page URL into the Google Rich Results Test. You should see the schema type detected and any rich result previews. If nothing is detected, the script may not be rendering server-side.
3. Building Your Own Generator: JSON-LD Template Pattern
If you manage many pages (e.g. a CMS or e-commerce store), a code-based generator is more scalable than a manual tool. Here is a simple JavaScript function pattern:
// generateArticleSchema.ts
export function generateArticleSchema(data: {
headline: string;
datePublished: string;
dateModified: string;
authorName: string;
authorUrl: string;
imageUrl: string;
description: string;
url: string;
}) {
return {
"@context": "https://schema.org",
"@type": "Article",
"headline": data.headline,
"datePublished": data.datePublished,
"dateModified": data.dateModified,
"author": {
"@type": "Person",
"name": data.authorName,
"url": data.authorUrl
},
"publisher": {
"@type": "Organization",
"name": "Your Site Name",
"logo": {
"@type": "ImageObject",
"url": "https://yoursite.com/logo.png"
}
},
"image": data.imageUrl,
"description": data.description,
"mainEntityOfPage": {
"@type": "WebPage",
"@id": data.url
}
};
}
// Usage in Next.js page:
// const schema = generateArticleSchema({ ...postData });
// <script type="application/ld+json"
// dangerouslySetInnerHTML={{ __html: JSON.stringify(schema) }}
// />4. Common Errors With Generated Schema
🚩 Placeholder text left in output
✅ Search generated JSON for "YOUR_", "example.com", "Lorem", or anything that looks like a template variable. Every placeholder must be replaced with real data.
🚩 Invalid date format
✅ Generators often output dates as YYYY-MM-DD. Google requires ISO 8601 with timezone for datePublished: "2026-02-25T09:00:00Z" or "2026-02-25T09:00:00+05:30".
🚩 Image URL not publicly accessible
✅ Never use localhost, staging domain, or login-protected URLs. The image URL must be crawlable by a bot without authentication.
🚩 Generator produced Microdata instead of JSON-LD
✅ Some older tools output Microdata (HTML attributes). Always select JSON-LD as the output format. If the tool only outputs Microdata, switch tools.
5. Frequently Asked Questions
Is using a schema generator safe, or should I write JSON-LD manually?▼
Generators are safe as a starting point, but always validate the output before deploying. Common issues: placeholder values left in, incorrect date formats, and non-public image URLs. Generators save time but cannot know your specific product or business details — review every field.
Which schema generator is best for beginners?▼
The Merkle Schema Markup Generator is the most beginner-friendly: it is free, form-based, requires no coding, and exports clean JSON-LD. For WordPress specifically, Yoast SEO or RankMath auto-generate schema from your post data without any manual work.
Do schema generators produce valid JSON-LD every time?▼
Not always. Most generators produce structurally valid JSON but may include optional fields with empty strings instead of omitting them, which some validators flag as warnings. Always check generated output against SchemaValidator.org before deploying.
Can I use a generator for schema types like JobPosting or Event?▼
Yes. Merkle, Rank Ranger, and Schema.dev all support JobPosting, Event, Course, and other less common types. For complex types like Product with AggregateRating and shippingDetails, manually reviewing and extending the generator output usually gives better results.
How do I add schema to a WordPress site without coding?▼
Install Yoast SEO Free (covers Organization, Article, BreadcrumbList automatically) or RankMath Free (wider schema type support). For custom types, use the RankMath Schema Generator UI or the Yoast SEO Premium FAQ/HowTo blocks. No JSON-LD editing required.
Why does my generated schema show errors in Google’s Rich Results Test?▼
The most common causes: (1) placeholder text left in fields, (2) image URL is not publicly accessible, (3) date is in wrong format (needs ISO 8601 with timezone), (4) price is a number instead of a string. Fix each error category before retesting.
Can I generate schema for an entire site at once?▼
For large sites, use a programmatic approach rather than a web-based generator. Write a template function (like the TypeScript example in this guide) that maps your CMS data fields to JSON-LD properties. This generates correct schema for every page at build time without manual input.
Does the schema generator need to be updated when I change page content?▼
Only if you hard-code the generated JSON-LD on the page. For static pages with fixed content, one-time generation is fine. For dynamic pages (product prices, event dates, stock levels), the schema must be generated programmatically so it stays in sync with the actual page data.
Validate Your Generated Schema
Paste your generator output and get an instant pass/fail report with line-level error explanations.
Validate Schema Now →