Check Server-side Rendering (SSR)

Check Server-side Rendering (SSR) is a free online tool that allows users to visually compare a webpage's server-side rendered version (JavaScript disabled) with its client-side rendered version (JavaScript enabled) to identify SSR issues, targeted at developers, SEO experts, and product managers working with modern web apps like React and Next.js.

🚀 Overview

Check Server-side Rendering (SSR) is a simple yet powerful web tool designed to help teams detect if a webpage's content is properly server-side rendered. By loading any URL twice—once with JavaScript disabled to simulate server output and once with it enabled—it displays both versions side-by-side, highlighting visual and HTML differences. This makes it easy to spot content that relies on client-side JavaScript, which can harm SEO and initial load times.

This project solves the problem of communicating SSR issues in SPAs and hybrid apps, where search engines like Googlebot might miss dynamically loaded content, leading to poor indexing or performance. It's built for frontend developers, SEO professionals, website owners, and product managers who need quick diagnostics without complex setups.

I (Punit Sethi) originally created this to share SSR problems with my teams, and now it's used globally by the dev and SEO communities to ensure better crawlability and user experience.

✨ Key Features

Side-by-side visual comparison of server-rendered (JS off) vs. client-rendered (JS on) page versions, making differences immediately apparent
Highlights UI discrepancies and raw HTML differences for deeper analysis
Free unlimited checks after simple sign-in (Google, Microsoft, GitHub, or verification code)
Results stored for 2 days (anonymous) or 7 days (logged-in users); desktop-optimized for best scrolling comparison
Optional: Upcoming features based on user feedback

🛠 Tech Stack

Frontend: Custom web application (likely React-based given creator's expertise)
Backend: Headless browser automation (e.g., Puppeteer or similar for JS control)
Database: Not specified
Auth: Google, Microsoft, GitHub OAuth + verification code
Hosting: Not publicly disclosed

👥 Who Is This For?

This project is useful for:

Developers who want to verify SSR in React, Next.js, or other frameworks
SEO experts ensuring content is crawlable by bots like Googlebot
Teams looking for quick diagnostics on page rendering issues
Product managers communicating performance problems to engineering

📸 Screenshots / Demo

Live demo: https://punits.dev/check-server-side-rendered
GitHub: https://github.com/punitsethi (creator's repo; tool source not public)

🔥 Project Status

🟢 Actively building

Last updated: 2026-03-24

❓ FAQ

Is this project free?

Yes — unlimited free checks after quick sign-in (no payment required).

Is the source code available?

No — proprietary tool developed by Punit Sethi.

Can I contribute?

Yes — report bugs, suggest features, or share feedback via email to punit@tezify.com. The creator responds quickly to issues and is gathering input for improvements.