Change default defParamCharset from latin1 to utf-8 - #1368
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BREAKING CHANGE: The default character set for parsing multipart form-data headers (e.g., filenames) is now 'utf-8' instead of 'latin1'.
This aligns with modern web standards where UTF-8 is ubiquitous. Users who need the previous behavior can explicitly set: `multer({ defParamCharset: 'latin1' })`
bjohansebas
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Feb 27, 2026
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We already had the v3 branch, right? Those changes should go there. But more importantly, I don’t think that option is even in v3 yet, which would be worth double-checking.
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BREAKING CHANGE: The default character set for parsing multipart form-data headers (e.g., filenames) is now 'utf-8' instead of 'latin1'.
This aligns with modern web standards where UTF-8 is ubiquitous. Users who need the previous behavior can explicitly set:
multer({ defParamCharset: 'latin1' })Continuation of #1210