Everyday Utilities for People Who Write Code
These are the small jobs that interrupt real work: an API response arrives as one unreadable line, a token needs decoding before you can see why auth is failing, a config file will not parse and the error message points at the wrong line. Each tool here does one of those jobs immediately, with no account and no install, which is the point. Reaching for a formatter should cost you five seconds, not a signup form.
Everything in this category runs in your browser using JavaScript, so the code, tokens and payloads you paste never reach a server. That matters more than it sounds: production API responses and JWTs routinely contain customer data, and pasting them into a site that uploads them is a habit worth avoiding. If you are debugging, start with the JSON formatter to see the shape of your data, then move to the JWT decoder or Base64 tools once you know what you are looking at.