Validators
Validators and testers let you check data and patterns against a set of rules — test a regular expression, validate JSON against a schema, evaluate a JSONPath query, or read a cron expression. All run locally in your browser.
Regex Tester
Test and debug regular expressions with live matching
JSON Schema Validator
Validate JSON against a JSON Schema definition
Cron Expression Parser
Parse and explain cron schedule expressions
JSONPath Tester
Query JSON documents with JSONPath expressions
Validators guides
- Regex cheat sheet: every token, with examplesA complete regular expression cheat sheet: character classes, anchors, quantifiers, groups, and flags, each with a plain-English meaning and an example.4 min read
- How to validate JSON: rules, common errors, and fixesLearn the rules of valid JSON, the most common errors like trailing commas and single quotes, and how to fix them — with examples you can test instantly.4 min read
- Cron expression examples and syntax guideUnderstand cron syntax field by field, learn the special symbols, and copy ready-made cron expressions for common schedules — with a plain-English meaning for each.5 min read