What structured data is and why sites need it
Structured data is code embedded in your page HTML that organizes information for search engines. You are telling the crawler: here is the address, here is the phone number, here is the product price, here is a review with a rating. Without markup, the search engine sees only text and tries to guess what is what. With markup, it knows for certain.
Schema.org is a shared vocabulary of data types supported by Google, Yandex, and other search engines. You use ready-made schemas (Organization, Product, Article, Event, LocalBusiness), the search engine reads them and can show an enhanced snippet: a product card with price and availability, star ratings, business hours, breadcrumbs.
Markup does not directly affect rankings, but it improves click-through rates. A snippet with price and reviews catches attention - users see the information they need before clicking through, and they click more often on results like that. This increases CTR, and rising clicks are an indirect quality signal to the search engine.
Which Schema.org types you need first
You do not need to mark up everything. Start with blocks that search engines can display in snippets and that genuinely help your audience.
Organization - the base schema for your homepage. You specify company name, logo, address, phone, social profiles. This helps search engines correctly display your brand name and contact details in the business card.
LocalBusiness - if you have an office, salon, cafe, or store with a physical address. You add coordinates, opening hours, payment methods. Yandex and Google may show this information in the contact block to the right of search results.
Product and Offer - essential for online stores. You mark up product name, price, currency, availability, SKU, image. If you have reviews, add AggregateRating with overall rating and review count. Search engines can show a product card with price and stars directly in results.
BreadcrumbList - breadcrumbs. Helps search engines understand site structure and show the path to the page in the snippet instead of just a URL. Especially important for large catalogs and blogs.
Article - for blog and news sections. You specify headline, author, publication date, image. Google uses this markup to form article cards in the Top Stories block and to correctly display publication dates.
FAQ and HowTo - if the page has a questions-and-answers section or step-by-step instructions. Search engines may expand part of the content directly in the snippet, increasing its height and visibility.
JSON-LD, microdata, or RDFa - which to choose
There are three ways to add structured data to a page: JSON-LD, Microdata, and RDFa. All three work, but for new projects I recommend JSON-LD.
JSON-LD is a separate code block in a <script type="application/ld+json"> tag inside <head> or at the end of <body>. You write structured data in JSON format without touching the HTML markup of your content. This is convenient: you can add, change, or remove markup without affecting layout. Google and Yandex both recommend this format.
Microdata uses itemscope, itemtype, and itemprop attributes inserted directly into HTML tags. The markup lives inside the content: <div itemscope itemtype="https://schema.org/Product">. It works, but when updating design it is easy to accidentally break the markup, and the code becomes less readable.
RDFa is similar to microdata but uses different attributes (vocab, typeof, property). Rarely seen, mainly on older sites. New projects do not use it.
If your site already runs on microdata and everything indexes correctly, you do not have to change it. If there is no markup or you are planning a redesign, use JSON-LD.
How to add markup to your site
If your site runs on a popular CMS (WordPress, Bitrix, Tilda, Shopify), there is likely basic markup already or it can be added with a plugin. For example, in WordPress this is handled by Yoast SEO or Rank Math. In Shopify product markup is enabled by default.
Check what is already marked up. Open the page source (Ctrl+U in the browser) and look for <script type="application/ld+json"> blocks. If there are none, there is no markup and you need to add it.
For online stores and corporate sites, markup is usually generated automatically by the CMS, pulling data from product cards, service pages, contacts. If your CMS cannot do this or the site runs on custom code, markup is written into templates manually.
For single-page sites and landing pages you can generate JSON-LD through free tools like Technical SEO Schema Markup Generator or Hall Analysis Schema Generator. Choose the schema type, fill in the fields, copy the finished code and paste it into the page <head>.
If you are hiring a developer to build your site, include structured data in the technical specification from the start. Adding it to a finished site costs more than building it in during layout.
How to check that your structured data is working
Adding markup is not enough - you need to confirm that search engines see it and interpret it correctly. Validators are tools that read the page code and show errors.
Google Rich Results Test (search.google.com/test/rich-results) is the main checking tool. You paste a page URL or markup code, the tool shows which data types were found, which are supported for enhanced snippets, and where there are errors. If it says "Page is eligible for rich results," you are good.
Yandex.Webmaster can also validate structured data. Go to Tools → Microdata Validator, paste the URL. The tool will show schemas found and warnings if something is filled out incorrectly.
Schema.org Validator (validator.schema.org) is a universal validator that checks compliance with the specification. It is stricter than Google and Yandex tools: it may show warnings even where search engines will accept the markup. Use it for final verification if you want the code to be flawless.
Common errors: missing required property (for example, price in a Product schema), incorrect data format (date in free form instead of ISO 8601), type mismatch (specified LocalBusiness but filled in Product fields). Validators highlight these problems with explanations - read and fix them.
Do you need to mark up the entire site at once
No. Mark up by priority: first the homepage (Organization, LocalBusiness), then service pages or product catalog (Product, Offer), then blog (Article), contacts, FAQ. If the site is large, start with sections that bring traffic.
Markup does not have to be on every page. If you have a service page (privacy policy, 404 page), marking it up is pointless - there is no content there that interests search engines.
Do not blindly copy someone else's markup. Schemas must match the actual page content. If you specified a Product price of 5000 rubles in the markup but the site says 7000, that is misleading, and the search engine may ignore the markup or impose penalties.
Structured data is not a magic button. It does not guarantee that an enhanced snippet will appear in search results: Google and Yandex decide whether to show additional elements. But without markup there is no chance of a rich snippet at all.
How much does structured data implementation cost
If the site is on a popular CMS and markup is configured through a plugin, it may take a couple of hours - check that the plugin is installed, fill in basic data, run it through a validator. The cost of such setup is usually included in basic SEO optimization.
For custom sites or complex catalogs, markup is written into templates manually. This is developer work: you need to understand the platform structure, add JSON-LD generation, test on all page types. This can cost several thousand dollars depending on scope.
At EFIMOV DEV we include basic structured data in projects by default - for corporate sites, landing pages, and online stores. If custom markup is needed for non-standard blocks (for example, Event schema for an event calendar or Recipe for a cooking blog), we discuss it during the brief. Exact estimate comes after we understand the content structure and SEO requirements.
Schema.org structured data is a way to explain the structure of page content to search engines. It does not raise rankings, but it makes snippets more visible and informative, which increases clicks. Start with basic schemas - Organization, Product, Article, LocalBusiness - and check the result with Google and Yandex validators. If the site is on a CMS, part of the markup can be configured through a plugin. For custom projects you will need a developer. The main thing is not to mark up for the sake of it: data in the code must match what the user sees on the page.
Frequently asked
Does structured data affect search rankings?
Not directly. Markup is not a ranking factor. But it improves snippet appearance, which increases click-through rates. Rising CTR can indirectly affect rankings because the search engine sees that your result gets more clicks.
Can I add structured data myself?
Yes, if the site is on WordPress, Tilda, or another popular CMS. Install an SEO plugin, fill in organization data, check with a validator. For custom sites you will need a developer - markup must be integrated into templates.
What happens if the structured data contains errors?
The search engine will simply ignore it. The enhanced snippet will not appear, but it will not hurt your rankings. The main thing is not to specify deliberately false information (a price that is not on the page) - that can be seen as manipulation.
Do I need to update markup when content changes?
If data is generated automatically from the CMS, updates happen on their own. If markup is static (written manually in code), when prices, addresses, or phone numbers change you need to update the JSON-LD block too.