UUID Generator (v4)
Generate one or up to 1,000 random v4 UUIDs at once, with uppercase, no-hyphen and brace options.
Convert Unix epoch timestamps to readable dates in UTC and your local time zone, or turn a date into a timestamp. Seconds and milliseconds are detected automatically.
A Unix timestamp counts seconds since 1 January 1970 00:00:00 UTC. Values with 13 digits are treated as milliseconds, as used by JavaScript.
PHP, MySQL and most servers use seconds (10 digits today). JavaScript uses milliseconds (13 digits).
Generate one or up to 1,000 random v4 UUIDs at once, with uppercase, no-hyphen and brace options.
Pretty-print JSON with your choice of indentation and optional key sorting. Errors are shown with line and column.…
Encode or decode URLs and query values with percent-encoding, and inspect a URL's host, path and parameters.
Test JavaScript regular expressions against your text with highlighted matches, capture groups and a live replace preview.
Remove all unnecessary whitespace from JSON and see how many bytes you save.
Check whether JSON is valid and find the exact line and column of any syntax error.
Convert JSON arrays into CSV for spreadsheets. Nested objects become dot-separated columns, and you can choose the delimiter.
Convert named and numeric HTML entities such as & and ’ back into readable characters.