Slim SEO Schema 2026: What’s Automatic vs What You Must Add

You installed Slim SEO because you want speed + simplicity, not a dashboard full of toggles. But schema is where beginners get confused fast: “It says it adds schema… so why don’t I see rich results?”
This guide shows exactly what Slim SEO does automatically and what you must add yourself if you want FAQ/HowTo/Product/Review schema done properly.

(Slim SEO is built by the eLightUp team based in Vietnam.)

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Core reality check (read this once, save hours later)

Structured data helps eligibility for rich results, but it doesn’t guarantee Google will show them. Google decides based on many factors (query, device, quality, intent, etc.).
So our goal isn’t “force rich snippets.” It’s: clean, accurate markup that matches visible content—so you don’t fail eligibility or trigger spam signals.

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What Slim SEO adds automatically (Free plugin)

Slim SEO outputs schema as JSON-LD in one script tag and also adds connections between schemas (so search engines can understand relationships, not just isolated objects).

Automatic baseline you get “out of the box”

For a beginner content blog, Slim SEO’s automatic baseline is usually enough for:

• Standard content understanding (page/post context)
• Clean structured data output without configuration
• A “set-and-forget” starting point (that’s literally the product philosophy)

Breadcrumb schema (also automatic)

If you use Slim SEO breadcrumbs, it automatically creates Breadcrumb schema in JSON-LD (and avoids injecting schema into the breadcrumb HTML to reduce conflicts).

What this means in real life:
If your blog is mostly informational posts, Slim SEO’s automatic schema is often “good enough” for baseline SEO hygiene—without you touching anything.

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What Slim SEO does not magically do (and why bloggers get disappointed)

Most “Slim SEO schema” posts skip the painful truth:

• Slim SEO does not automatically create every rich-result schema type you’ve heard about.
• “Basic schema is on” ≠ “FAQ stars will appear.”
• If you want specific schema types (FAQ/HowTo/Product/Review/Video/etc.), you must add them intentionally—and only where they genuinely match the page.

This is why people switch from Rank Math and feel like: “My rich snippets disappeared.”
Often they didn’t disappear. They were coming from Rank Math’s extra schema modules—and Slim SEO intentionally stays lean.

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The clean split in 2026: Free baseline vs Schema Builder

Slim SEO’s ecosystem is basically:

• Slim SEO (Free): automatic basics
• Schema builder (Pro / add-on): advanced schema types + control

WordPress lists Slim SEO Pro as including a visual schema builder, “30+ pre-built schema types,” and “custom schema with JSON-LD.”
And Slim SEO Schema is positioned as a visual schema builder where you select schema types + properties without writing code.

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Automatic vs Must Add (fast table you can paste into your blog)

Page type (content blog)	Slim SEO automatic enough?	What you must add (if needed)
Normal blog post (informational)	✅ Yes	Optional FAQ (only if visible), optional HowTo (only if truly steps)
“Best tools” list post (affiliate)	✅ Usually	FAQ (if you include real Q&A), avoid fake Product/Review markup
Tutorial (step-by-step)	✅ Baseline	HowTo schema (if the steps are clearly written on-page)
Homepage / About	✅ Yes	Usually nothing extra
Video post (embedded video)	✅ Baseline	VideoObject only if you include the video + supporting info

Beginner rule: add schema only when it matches the content type and is visible on the page.

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What you MUST add (if you want richer schema types)

If your goal is “do schema properly” (and not just “turn it on”), these are the common must-add cases:

FAQ schema (only if you show the Q&A on the page)

If you add FAQ schema, the questions and answers must be visible and not misleading. Hidden/irrelevant markup can break eligibility.
Slim SEO Schema has documented workflows for creating FAQ schema across multiple pages.

HowTo schema (only for true step-by-step tutorials)

If your post is “tips,” don’t force HowTo. If it’s steps, then HowTo can fit.

Product / Review schema (only where it truly applies)

For affiliate bloggers, this is the biggest mistake online:

• People mark up list posts as Product pages.
• Or add Review schema without real review content.

That can look spammy or misleading. Keep list posts as Article + clean internal structure unless you truly have a product page experience.

Custom schema types for custom post types / special pages

If you have custom post types (recipes, events, courses), you’ll need schema rules that match those post types.

Slim SEO Pro explicitly supports applying schemas with conditions and provides an “Add Schema” flow.

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How the Slim SEO schema builder works (in plain language)

Here’s the “no-fake-promises” explanation:

You pick a schema type, then fill properties

Slim SEO Schema is built as a visual builder: you choose the schema type and properties, and it outputs JSON-LD.

You can map schema to dynamic data (titles, author, custom fields)

Slim SEO Schema supports dynamic data mapping (including site/user data and custom fields like Meta Box / ACF).

You can connect schemas into a unified graph

This is a real advantage: you can connect schema objects and build a cleaner knowledge graph structure rather than scattered fragments.

Why that matters: clearer entity relationships = better understanding. (Still not a guarantee of rich results, but it’s technically cleaner.)

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The #1 gap bloggers miss: duplicate schema after switching from Rank Math

If you’re migrating from Rank Math, this is where people break things:

• Rank Math outputs schema
• Slim SEO outputs schema
• Your theme might output breadcrumbs schema
• Now Google sees duplicates/overlaps

Slim SEO’s own guidance explains using Slim SEO Schema to overwrite schema data from SEO plugins and unify the output.

Quick “no-duplicate” migration checklist

1. Disable Rank Math schema-related modules first (if possible).
2. Install Slim SEO and retest.
3. Add Slim SEO Schema/Pro schema types only where needed.
4. Retest with Google tools (next section).

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How to test your schema like a professional (10 minutes)

Step 1 — Rich Results Test (Google)

Use the Rich Results Test to see which rich results your page is eligible for.

Step 2 — General guidelines check

If you’re marking up content that’s hidden/misleading/incorrect, you can fail eligibility even if the JSON-LD is valid.

Step 3 — Fix required fields

Rich results require certain fields. Missing required properties can block eligibility.

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FAQs