Developer Tools calculators
Browser-based formatters, encoders, validators and developer utilities.
Format JSON into clean, readable indentation locally.
Check JSON syntax and see clear parsing errors locally.
Remove optional whitespace from valid JSON.
Encode Unicode text as standard Base64.
Decode valid Base64 into Unicode text.
Percent-encode text for use in a URL component.
Decode percent-encoded URL text safely.
Generate one or more cryptographically random UUID v4 values.
Convert Unix timestamps and readable dates.
Decode JWT headers and payloads locally without verification.
Test JavaScript regular expressions and capture groups.