Developer tools for everyday debugging
Quick utilities for the small tasks that interrupt real work: checking whether a JSON payload is valid, decoding a token from a failing request, encoding a query parameter, generating test IDs or comparing two versions of a config file. Everything runs client-side, so it is safe to paste API responses, logs and tokens that should never leave your machine.
Tools in this collection
- JSON Formatter & Validator: pretty-print, minify and locate syntax errors by line and column.
- JWT Decoder: read the header and claims of a JSON Web Token and check its expiry.
- Base64 and URL encoder/decoder: convert text safely for headers, URLs and data URLs.
- Regex Tester: test JavaScript regular expressions with live highlighting and capture groups.
- Diff Checker: compare two texts by line, word or character.
- UUID Generator and Unix Timestamp Converter for IDs and dates.
All tools work offline once the page has loaded, have no rate limits and require no account.