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Decode JWT tokens to view header, payload, signature, and expiry
Validate, pretty-print or minify JSON with error line:col reporting
Convert Unix timestamps to dates, auto-detect seconds/milliseconds
Convert text to/from Base64, handles Unicode correctly, URL-safe mode
URL encode/decode supporting both component and full URI modes
Online regex tester with group highlighting and match details
Batch generate UUID v4 unique IDs using cryptographic random
Convert between Chinese and Unicode escape sequences
Convert between text and hex UTF-8 bytes with 0x/space format support