docs: clarify MIME type changes when migrating from Express 4 to 5#1903
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ShubhamOulkar merged 8 commits intoexpressjs:gh-pagesfrom Jun 23, 2025
achaljhawar:gh-pages
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docs: clarify MIME type changes when migrating from Express 4 to 5#1903ShubhamOulkar merged 8 commits intoexpressjs:gh-pagesfrom achaljhawar:gh-pages
ShubhamOulkar merged 8 commits intoexpressjs:gh-pagesfrom
achaljhawar:gh-pages
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bjohansebas
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May 15, 2025
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@bjohansebas I have added it back |
bjohansebas
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May 17, 2025
bjohansebas
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May 17, 2025
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@bjohansebas I have done the changes you asked me to do. |
bjohansebas
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May 24, 2025
ShubhamOulkar
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Jun 5, 2025
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Thank you @achaljhawar |
krzysdz
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Mar 23, 2026
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| - JavaScript files (.js): now served as "text/javascript" instead of "application/javascript" | ||
| - JSON files (.json): now served as "application/json" instead of "text/json" | ||
| - CSS files (.css): now served as "text/css" instead of "text/plain" | ||
| - HTML files (.html): now served as "text/html; charset=utf-8" instead of just "text/html" | ||
| - XML files (.xml): now served as "application/xml" instead of "text/xml" | ||
| - Font files (.woff): now served as "font/woff" instead of "application/font-woff" |
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Almost everything in this section is incorrect. Of all listed extensions only one has a different mime type - .js changed from application/javascript to text/javascript. HTML, CSS, JS and JSON also always had charset specified in Content-Type, so this didn't change either.
krzysdz
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Mar 23, 2026
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+327
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| - JavaScript files (.js): now "text/javascript" instead of "application/javascript" | ||
| - JSON files (.json): now "application/json" instead of "text/json" | ||
| - CSS files (.css): now "text/css" instead of "text/plain" | ||
| - XML files (.xml): now "application/xml" instead of "text/xml" | ||
| - Font files (.woff): now "font/woff" instead of "application/font-woff" | ||
| - SVG files (.svg): now "image/svg+xml" instead of "application/svg+xml" |
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This PR improves the Express 5 migration guide by documenting an important change in MIME type handling that affects users migrating from Express 4 to Express 5.
Issue #1880
When migrating from Express 4 to Express 5, we discovered that JavaScript files served via
res.sendFile()now return a Content-Type of "text/javascript" instead of the previous "application/javascript". This change occurs because Express 5 switched from its internal MIME type handling to themime-typespackage.Changes
express.static.mimesection explaining that this change affects other methods likeres.sendFile()res.sendfile()section warning about potential Content-Type differencesThese documentation improvements will help users understand and prepare for potential MIME type differences when upgrading to Express 5, even if they weren't directly using
express.static.mime.Developer's Certificate of Origin 1.1 is acknowledged and agreed to.