Hado SEO

    JavaScript
    Rendering Score

    Get a comprehensive score measuring how crawler-friendly your JavaScript site really is. Find exactly what's hurting your SEO.

    What We Analyze

    Five key areas that determine your JavaScript SEO health

    Content Visibility

    % of content in initial HTML

    SEO Elements

    Title, meta, H1, canonical

    Social Tags

    OG tags, Twitter cards

    Render Strategy

    SSR, CSR, or prerender

    Structured Data

    JSON-LD schema markup

    Calculate Your Rendering Score

    Understanding Your Score

    What each grade means for your search visibility

    A (90-100)

    Excellent

    Your site is well-optimized for search crawlers. Content is visible in initial HTML, and all SEO elements are properly configured.

    B (80-89)

    Good

    Most SEO elements are in place. Minor improvements could boost your crawler-friendliness, but you're in good shape.

    C (70-79)

    Needs Work

    Some content or SEO elements are missing from initial HTML. Search engines may have difficulty fully indexing your site.

    D (60-69)

    Poor

    Significant SEO issues detected. Much of your content likely relies on JavaScript execution, causing indexing delays.

    F (<60)

    Critical

    Your site has serious crawler-friendliness issues. Search engines likely see an empty page or minimal content. Implementing prerendering or SSR is strongly recommended.

    Frequently Asked Questions

    What does the JavaScript Rendering Score measure?
    The score evaluates five key areas: Content Visibility (how much content is in initial HTML), SEO Elements (title, meta description, H1, canonical), Social Meta Tags (Open Graph, Twitter cards), Rendering Strategy (SSR vs CSR detection), and Structured Data (JSON-LD schemas). Each area contributes to your overall score.
    What's a good JavaScript Rendering Score?
    An A grade (90-100) indicates excellent crawler-friendliness. B (80-89) is good with minor improvements needed. C (70-79) means some content or SEO elements are missing from initial HTML. D or F scores indicate serious issues that likely affect your search visibility.
    Why does content visibility matter for SEO?
    Search engine crawlers primarily read the initial HTML your server sends. If most of your content is loaded via JavaScript after the page loads, crawlers may not see it or may see it with delays. High content visibility in initial HTML ensures faster, more reliable indexing.
    How can I improve my JavaScript Rendering Score?
    The most effective ways are: 1) Implement server-side rendering (SSR) with frameworks like Next.js or Nuxt, 2) Use prerendering/dynamic rendering to serve static HTML to bots, 3) Ensure meta tags, titles, and structured data are in the initial HTML, not added by JavaScript.
    Does Google really have trouble with JavaScript sites?
    Google can render JavaScript, but with limitations. There's a two-phase indexing process with delays between crawling and rendering. Pages may be indexed with incomplete content initially. Complex JavaScript, timeouts, and errors can prevent full rendering. Prerendering eliminates these risks.

    Related Free Tools

    What Does Google See?

    Raw HTML vs rendered DOM comparison

    Hydration Delay Analyzer

    Measure time-to-content for crawlers

    Dynamic Rendering Validator

    Validate bot vs user content serving

    Stop losing traffic to invisible pages

    Make your app discoverable on Google, shareable everywhere, and ready for real traffic.

    Works with Lovable, Replit, and Bolt.new