slugify-lite

URL slugs: unicode to ASCII transliteration, word-boundary truncation, uniqueness helper.

Quick Start

import { slugify, unique } from "slugify-lite";

slugify("Crème Brûlée Recipe!");        // "creme-brulee-recipe"
slugify("Español café");                 // "espanol-cafe"

// Truncate at word boundary
slugify("long title here", {maxLength: 20});  // "long-title-here" (keeps words)

// Ensure uniqueness
const taken = (s) => existingSlugs.has(s);
unique("recipe", taken);                 // "recipe-2" (if "recipe" taken)

API

slugify(input: string, opts?: SlugOptions): string

Convert unicode string to URL-safe slug.

Options:

• separator?: string — Character between words (default: "-")
• maxLength?: number — Truncate at word boundary if longer

Coverage: Built-in map for Latin-1 + common European diacritics (À, É, Ñ, Ü, etc.). Characters without diacritics pass through unchanged; non-ASCII without a mapping are removed.

unique(base: string, taken: (s: string) => boolean, maxAttempts?: number): string

Generate unique slug by appending -2, -3, etc.

• taken — Predicate: is this slug already in use?
• maxAttempts — Stop after N attempts (default: 100)

Throws Error if unique slug cannot be found.

Limitations

• Not full ICU: Covers Latin scripts only (À-Ž range). Non-Latin scripts (Chinese, Arabic, Greek) are stripped.
• No transliteration library: Diacritics map is manually curated, not comprehensive.
• No locale-specific pluralization or case rules.

Part of the ferrow-toolkit collection · Sponsored by Ferrow