CSR vs SSR
Differences, use cases, and when to use each
Client-Side Rendering (CSR) sends minimal HTML and renders in the browser via JavaScript. Server-Side Rendering (SSR) renders HTML on the server per request. CSR suits dynamic apps; SSR improves SEO and initial load performance.
Quick Comparison
| Feature | CSR | SSR |
|---|---|---|
| Rendering Location | Browser (JavaScript) | Server (per request) |
| Initial Load | Slow (JS download required) | Fast (HTML arrives pre-rendered) |
| SEO | Challenging (crawlers may not execute JS) | Excellent (pre-rendered HTML) |
| Server Load | Low (static files only) | Higher (render per request) |
| Interactivity After Load | Rich | Rich (with hydration) |
When to Use Each
When to Use CSR
Use CSR for highly interactive applications (dashboards, tools, admin panels) where SEO isn't critical and users expect a rich app-like experience after initial load.
When to Use SSR
Use SSR for content-heavy websites (blogs, e-commerce, landing pages) where SEO and fast initial page visibility are critical to user experience and discoverability.
Pros & Cons
CSR
SSR
Verdict
Modern frameworks (Next.js, Nuxt, SvelteKit) support both per page. Use SSR for content pages requiring SEO; CSR for app-like interactive sections. Static generation (SSG) often beats both for content sites.