How to Normalize Unicode Strings in Go

Use unicode.NFC or unicode.NFD from the golang.org/x/text/unicode/norm package to normalize strings. The NFC form is the standard for most applications, while NFD decomposes characters into base characters and combining marks.

import "golang.org/x/text/unicode/norm"

normalized := norm.NFC.String(input)

For NFD normalization, replace NFC with NFD in the code above.

Unicode normalization ensures that different ways of representing the same character are treated as identical. This matters when comparing strings, searching databases, or validating input to avoid bugs caused by hidden character variations. Think of it like ensuring "café" and "café" (e with a separate accent) are recognized as the same word.