Unicode Normalize API
Normalize and fold Unicode text. Convert any string to one of the four Unicode normalization forms — NFC, NFD, NFKC, NFKD — so that visually identical text with different code-point compositions (é as one code point vs e + a combining accent) compares and stores consistently. Fold diacritics and special letters to plain ASCII (café → cafe, Straße → Strasse, Ångström → Angstrom, Łódź → Lodz) for slugs, search keys and filenames; the fi ligature and similar compatibility characters are expanded under NFKC/NFKD. And compare two strings for equality after normalization, optionally case-insensitively. Perfect for deduplication, search and indexing, username and identifier checks, and defending against look-alike (homoglyph) input. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. Distinct from Unicode character-database lookups and from text segmentation.
api.oanor.com/normalize-api
