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PHP
Validate URL (scheme + host)
Beyond filter_var, also require the URL to have an http(s) scheme and a non-empty host. Rejects "javascript:" and other risky pseudo-schemes commonly seen in stored XSS.
@admin
PHP
URL-Safe Base64 Encode / Decode
Standard base64 uses + and / which break in URLs. Swap them for - and _, drop the = padding, and you get a string you can put in path segments and query parameters safely.
Python
Slugify (unicodedata, zero deps)
Convert any string to a URL-safe slug using only stdlib. Normalizes Unicode (NFKD), strips combining marks, lowercases, replaces non-alphanumerics with a separator.
TypeScript
Slugify (Unicode-aware)
Turn any string into a URL-safe slug. Uses Intl normalize + diacritic stripping so "Café" becomes "cafe". No external dependency.
JavaScript
Slugify String
Converts any string into a URL-safe slug: lowercases it, replaces accented characters with ASCII equivalents, strips all non-alphanumeric characters (except hyphens), and collapses multiple hyphens into one. Ideal for generating URL slugs from blog titles, product names, or user input.
TypeScript
URL Builder with Type-Safe Query
Build URLs with a clean query-param API. Skips null/undefined automatically, encodes everything, and accepts arrays for repeated keys. Avoids manual string concatenation.
JavaScript
Validate URL
Validates whether a string is a well-formed URL using the native URL constructor, which matches browser parsing behaviour exactly. Optionally restricts to specific protocols (defaults to http and https). No regex maintenance required — if the browser can parse it as a URL, this returns true.
JavaScript
Parse URL Query String
Parses a URL query string into a plain key-value object. Uses the built-in URLSearchParams API — no regex required. Handles duplicate keys (returns the first value), percent-encoded characters, and works with both full URLs and raw query strings. Pairs nicely with buildQueryString.