Developer Tools

7 tools

Small jobs interrupt development all day: reading a large API response, checking why a regular expression does not match, decoding a login token, working out a cron schedule or spotting what changed between two files. These tools answer those questions in the browser, without installing anything.

The JSON Viewer turns long JSON into a collapsible tree, the Regex Tester highlights every match and group, and the JWT Decoder reads and verifies tokens. The Cron Expression Generator explains schedules and lists the next run times, the Diff Checker compares two texts line by line and word by word, the Syntax Highlighter colours code for slides and documents, and the SSH Config Generator turns long ssh commands into short aliases. Everything runs on your own device.

JSON Viewer

Explore JSON as a collapsible tree and copy the path of any value.

Code Syntax Highlighter

Colour code in 30+ languages with a choice of themes, and copy it as rich text or HTML.

Regex Tester

Test JavaScript regular expressions live, see every match and group, and try replacements.

Cron Expression Generator

Build and explain cron schedules, and see the next times a job will run.

JWT Decoder & Encoder

Decode a JSON Web Token, check its expiry, verify an HMAC signature, or sign a new token.

Diff Checker

Compare two texts or code files and highlight every added, removed and changed line and word.

SSH Config Generator

Create ~/.ssh/config entries so you can connect with a short alias instead of long ssh commands.

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