HTTP Headers Parser

URL Parser

Break a URL down into its parts — protocol, host, port, path, query parameters, fragment.

Query String ↔ JSON

Parse a URL query string into a JSON object, or build a query string back from JSON.

User-Agent Parser

Break a User-Agent string down into browser, engine, operating system, and device type.

Basic Auth Generator

Generate or decode an HTTP Basic Authentication header — Base64(username:password).

Cookie Parser

Parse a Set-Cookie header or a Cookie/document.cookie string into name, value, attributes, and a check for common security mistakes.

CORS Checker / Explainer

Explain step by step whether the browser will allow a cross-origin request — simple/preflight classification, Access-Control-* response header checks, and a verdict.

Barcode Generator

Generate a linear barcode (CODE128, EAN-13, UPC, CODE39, and others) from text or digits.

URL Encode/Decode

Encode and decode URLs — characters that need escaping in links and query parameters.

Date Diff Calculator

Exact difference between two dates/times — calendar breakdown (years, months, days…), total duration, and business day count.

sitemap.xml Generator

Build a sitemap.xml from a list of URLs — with lastmod/changefreq/priority, validation, and duplicate removal.

JS Minify / Beautify

Compress JavaScript for production, or format minified code into a readable layout.

Bitwise Operations

AND/OR/XOR/NAND/NOR/XNOR/NOT and shifts on integers of a given width (8/16/32/64 bits) in any number base.