Use when auditing slow page loads, heavy assets, or rendering delays related to Avoid JavaScript-based redirects. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes.
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---
name: js-redirects
description: "Use when auditing slow page loads, heavy assets, or rendering delays related to Avoid JavaScript-based redirects. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes."
metadata:
category: performance
priority: medium
difficulty: intermediate
estimatedTime: "10"
source: frontendchecklist.io
url: https://frontendchecklist.io/rules/performance/js-redirects
---
# Avoid JavaScript-based redirects
JavaScript redirects force an additional round-trip after the initial page load, significantly increasing the time users spend waiting for content.
## Quick Reference
- Use 301 or 302 server-side redirects instead of `window.location`
- JS redirects delay page load as the browser must first download and execute the script
- Client-side redirects can negatively impact SEO and indexability
## Check
Check the project for instances where JavaScript is being used for page-level redirects (e.g., window.location).
## Fix
Replace JavaScript-based redirects with server-side 301 or 302 redirects in your web server or edge configuration.
## Explain
Explain why server-side redirects are faster and more SEO-friendly than client-side JavaScript redirects.
## Code Review
Review the routes, assets, and loading behavior that affect Avoid JavaScript-based redirects. Flag exact files, requests, or rendering steps that add unnecessary network, CPU, or layout cost, and describe the measurement method used to confirm the issue.
---
For full implementation details, code examples, and framework-specific guidance,
see `references/rule.md`.
Rule page: https://frontendchecklist.io/rules/performance/js-redirects
