2026-05-18 · 1 min read
Minify JS and CSS for production builds
Ship smaller assets without debugging minified source during development.
JavaScriptCSSperformance
Key takeaways
- Never debug production-minified files—keep beautified sources in repo.
- Minify after tests pass; compare gzip sizes, not only raw bytes.
Separate dev and release steps
Use beautify modes while iterating; switch to minify only for artifacts uploaded to CDN or static hosting.
Keep source maps or original sources available for incident response.
Verify after minify
Run smoke tests on staging with minified assets—syntax errors from aggressive compression show up only at runtime.
Compare CSS and JS output sizes together; both contribute to first-load weight.
FAQ
Does minify always help LCP?
Smaller assets help, but critical path and caching matter more—measure with real profiles.
Should I minify inline scripts?
Prefer moving logic to bundles; minify inline only when unavoidable and test thoroughly.