Developer

Developer tools

Focused browser utilities for formatting data, checking schedules, testing patterns, and generating development identifiers.

4 tools

Choose a focused utility and complete the task in the browser.

Format, validate, and inspect JSON with a readable layout.

Test JavaScript regular expressions against sample text.

Generate random UUID v4 values for tests, fixtures, and IDs.

Explain five-field cron expressions with field-by-field checks.