Code Validator
NewRegular Expression Tester
A Regular Expression (Regex) Tester lets you create, test, and debug regex patterns. It supports syntax like quantifiers, character classes, anchors, groups, and lookaheads, helping you match, search,...
NewCron Expression Generator & Explainer - Quartz
Easily create and decode Quartz cron expressions. Convert cron syntax into readable schedules, preview upcoming run times, and explore ready-to-use cron examples.
NewCredit Card Number Generator - Validator
Generate fake credit card numbers for all major brands—Visa, MasterCard, Amex, and more. These numbers are for testing only and can't be used for real transactions. Validate formats using the Luhn a...
NewXPath Tester - Evaluator
Test and evaluate your XPath queries with this powerful XPath Tester. Supports XPath 2.0/3.0, advanced functions (string(), number(), name(), etc.), and XML namespaces. No node-only limitations—full...
NewHTML Validator - Linter
Validate HTML files for W3C compliance and code quality. Detect missing or unbalanced tags, duplicate IDs, invalid attributes, and more. Supports HTML5, SVG 1.1, MathML 3.0, and RDFa Lite 1.1. Powered...
NewJSON Validator
Validate your JSON strings for correctness and formatting. Supports both strict RFC 4627 compliance and JavaScript-compatible lenient modes.