Decode a JSON Web Token header and payload locally without uploading the token.

Generate one or many cryptographically random UUID version 4 identifiers.

Create SHA-1, SHA-256, SHA-384, or SHA-512 hashes from text or local files.

Test a regular expression, inspect matches and capture groups, and preview replacements.

Convert Unix timestamps to readable dates or turn a date and time into seconds and milliseconds.

Convert quoted CSV data to JSON or turn an array of JSON objects into CSV.

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