Network/HTTP

Cookie Parser

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

Similar tools

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).

HTTP Headers Parser

Parse raw HTTP headers (from curl -I, DevTools, raw response) into a field list with descriptions and a security headers check.

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.

Other tools

TOTP Generator/Verifier

Time-based one-time passwords (TOTP, RFC 6238) — generate the current code from a secret and verify an entered code with clock-drift tolerance.

Roman Numeral Converter

Arabic number ↔ Roman numeral. Type into either field and the other updates automatically.

JSON Sort Keys

Recursively sort JSON object keys alphabetically — array element order is left untouched, only object keys at every nesting level.

Barcode Generator

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

Sort & Dedupe Lines

Sort lines of text alphabetically, remove duplicates, empty lines, and extra whitespace.

JSONPath Tester

Test JSONPath expressions against real JSON data — instantly see the matched values and their paths.