Developer Tools
Browser-based tools for working with data and code.
JSON Formatter & Validator
Check JSON against the strict standard, see exactly where it breaks, and format or minify it. It runs in your browser.
Unix Timestamp Converter
Convert Unix timestamps in seconds, milliseconds, microseconds or nanoseconds to a date, and a date and time zone back to a timestamp, with daylight-saving gaps and overlaps explained. It runs in your browser.
Text Diff / Compare
Paste two versions of a text and see what was added, removed and changed, line by line with the changed words marked. It runs in your browser.
JWT Decoder
Read the header and payload of a JSON Web Token, see its claims explained and its times as dates. It does not check the signature. It runs in your browser.
Cron Expression Explainer
Paste a five-field cron expression written in cronie crontab syntax to see what each field means, a plain-language summary and the next five matching times in UTC. It checks the syntax, says what it does not support and runs in your browser.
Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 back to text, with UTF-8 support and a clear message for invalid input. It runs in your browser: nothing is uploaded.