Developer

Pretty-print, minify and validate with error position

Encode/decode text — handles UTF-8 and emoji correctly

Percent-encode values or whole URLs

Unix timestamps to dates — local time and UTC

SHA-1 / SHA-256 / SHA-384 / SHA-512 computed locally, HEX and Base64 output

Generate UUID v4 in batches

Inspect header, payload and expiry (no signature check)

Live highlight of matches and capture groups

Explain a crontab expression and list next run times

Convert a decimal number, a 0x hexadecimal number, or a 0b binary number and see decimal, binary, octal, and hexadecimal results in one place. Useful for reading register values, writing bit masks, and checking color codes. Fractional input is truncated to an integer.

Turn comma-separated rows into an array of JSON objects, using the first row as field names. Fields wrapped in double quotes can contain commas, and doubled quotes become one quote. Every value stays a string; numbers, booleans, and null are not inferred. Good for moving a small config table into code or an API.

Turn a JSON array into CSV text, using the keys of the first object as the header row and quoting fields that contain commas, quotes, or line breaks. Useful for pasting API results into a spreadsheet. Nested objects and arrays are not expanded and show up as [object Object].

Split a full URL into protocol, host, path, query string, and fragment, then list each query parameter with percent-decoding applied. Useful for checking redirect links, utm parameters, and API callback URLs. Relative paths and strings without a protocol cannot be parsed.

Convert a color between HEX, RGB and HSL and see its relative luminance, which tells you whether dark or light text will read better on it. Accepts #RGB, #RRGGBB and rgb(12, 34, 56) input for quick checks while styling.