@knide/pathnorm

Normalize and join path or URL segments into a single clean string.

• Zero dependencies
• Full TypeScript support
• Tree-shakeable
• < 500B minified + gzipped — use @knide/pathnorm/posix for an even lighter bundle in browser-only contexts

Installation

npm install @knide/pathnorm
# or
yarn add @knide/pathnorm
# or
pnpm add @knide/pathnorm

Two Entry Points

| Import | Win32 | UNC | Namespace | URLs | POSIX | |-------------------------|-------|-----|-----------|------|-------| | @knide/pathnorm | ✅ | ✅ | ✅ | ✅ | ✅ |
| @knide/pathnorm/posix | ❌ | ❌ | ❌ | ✅ | ✅ |

Use @knide/pathnorm/posix in browser or web server contexts where Win32 paths will never appear — it's lighter and purpose-built for URLs and POSIX paths.

@knide/pathnorm

Exports np and unixNp.

import { np, unixNp } from '@knide/pathnorm'

np(...parts) (POSIX + Win32 + UNC + URLs)

Joins and normalizes path or URL segments. Detects and handles URLs, POSIX paths, Win32 drive letters, UNC paths, and Win32 namespace paths automatically.

import { np } from '@knide/pathnorm'

// URLs
np("https://example.com//api/", "v1//users", "profile")
// → "https://example.com/api/v1/users/profile"

np("exp://com.myapp//screens/", "home")
// → "exp://com.myapp/screens/home"

// POSIX
np("/var/www//html/", "assets//images", "logo.png")
// → "/var/www/html/assets/images/logo.png"

np("uploads//images", "/photos")
// → "/uploads/images/photos"

// Win32 drive letter
np("C:\\Users\\\\Alice\\Documents", "report.pdf")
// → "C:\Users\Alice\Documents\report.pdf"

// UNC
np("\\\\server01\\share\\\\docs", "letter.txt")
// → "//server01/share/docs/letter.txt"

// Win32 namespace
np("\\\\?\\C:\\Users\\\\Alice", "report.pdf")
// → "//?/C:/Users/Alice/report.pdf"

// Mixed slashes
np("C:\\projects//my-app\\\\src")
// → "C:\projects\my-app\src"

unixNp(...parts) (always forward slashes)

Like np, but always returns a Unix-style path with forward slashes. Useful when working with Win32 paths in a Unix-expecting context.

import { unixNp } from '@knide/pathnorm'

unixNp("C:\\Users\\\\Alice\\Documents", "report.pdf")
// → "C:/Users/Alice/Documents/report.pdf"

unixNp("\\\\server01\\share\\\\docs", "letter.txt")
// → "//server01/share/docs/letter.txt"

unixNp("\\\\?\\C:\\Users\\\\Alice", "report.pdf")
// → "//?/C:/Users/Alice/report.pdf"

unixNp("/var/www//html", "index.html")
// → "/var/www/html/index.html"

@knide/pathnorm/posix

Exports np. No Win32 support — ideal for browser and web server environments.

import { np } from '@knide/pathnorm/posix'

np(...parts) (POSIX + URLs)

import { np } from '@knide/pathnorm/posix'

// URLs
np("https://example.com//api/", "v1//users", "profile")
// → "https://example.com/api/v1/users/profile"

np("exp://com.myapp//screens/", "home")
// → "exp://com.myapp/screens/home"

// POSIX
np("/var/www//html/", "assets//images", "logo.png")
// → "/var/www/html/assets/images/logo.png"

np("uploads//images", "/photos")
// → "/uploads/images/photos"

// Typical web usage
np(window.location.origin, "/api/proxy//betterauth")
// → "https://myapp.com/api/proxy/betterauth"

Behavior Notes

• Only the first segment is checked for a URL scheme (://). Subsequent segments that look like URLs are treated as plain path parts.
• Leading slashes are preserved if any segment introduces one.
• Consecutive slashes (or backslashes in Win32 mode) are collapsed into one.
• Trailing slashes are not preserved.

// Only the first segment's scheme is treated as a URL prefix
np("https://example.com//", "/api/v1", "http://users")
// → "https://example.com/api/v1/http:/users"