About the developer tools
These are the small utilities developers keep open in a spare tab: formatting JSON, encoding and decoding strings, reading tokens, generating IDs and hashes, testing patterns, converting timestamps, comparing text and translating colours between formats. Every one of them runs in your browser, so the API responses, tokens and config files you paste in are never sent to our server.
They suit web and back-end developers, testers, and anyone who works with APIs, logs or configuration files and wants a quick answer without installing anything.
Picking the right tool
When you are debugging an API, start with the JSON Formatter. It indents a response and gives the line and column where invalid JSON breaks. A failing sign-in often comes down to the token, and the JWT Decoder shows its claims with readable expiry dates. For strings, Base64 Encode / Decode handles both text and files, while URL Encode / Decode turns spaces and symbols into percent codes and lists the parameters of a query string.
The Hash Generator gives MD5, SHA-1 and SHA-2 hashes for checking downloads, and the UUID Generator makes up to 1,000 version 4 or version 7 IDs at once. The Regex Tester highlights matches in your sample text and lists the capture groups for each one. The Unix Timestamp Converter turns epoch numbers into dates and back, the Diff Checker shows line and word changes side by side, and the colour converter moves between HEX, RGB, HSL, HSV and CMYK with a contrast check.