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A good place to start
Format, validate, and minify JSON with readable output and clear error messages.
Encode plain text to Base64 or decode Base64 back into UTF-8 text.
Convert Unix timestamps to readable dates, or convert a local date and time to Unix time.
Clean up compact or copy-pasted SQL from database logs into readable multi-line queries.
Format minified HTML, CSS, and JavaScript into readable, consistently indented code.
Decode JWT headers and payloads, inspect claims, verify HMAC signatures, and create signed tokens with HS256, HS384, or HS512.
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