Code Validator
Regular 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,...
FREE
UNLIMITED
Cron 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.
FREE
UNLIMITED
Credit 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...
FREE
UNLIMITED
XPath 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...
FREE
UNLIMITED
HTML 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...
FREE
UNLIMITED
JSON Validator
Validate your JSON strings for correctness and formatting. Supports both strict RFC 4627 compliance and JavaScript-compatible lenient modes.
FREE
UNLIMITED