Free online developer tools

Small utilities for daily development work

Reading a minified API response, checking when a timestamp in a log file actually happened, inspecting the claims of a token or testing a regular expression before it goes to production: these are tasks a developer runs into several times a week. Opening a full IDE or writing a throwaway script for each of them takes longer than the task itself.

This family keeps those utilities together, along with converters for common data formats such as CSV, YAML and XML, and a few tools for launching a website, such as a favicon generator, a meta tag generator and a robots.txt file builder.

Pick by task

• JSON formatter: indents JSON and points out syntax errors.
• Unix timestamp converter: turns epoch time into a readable date and back.
• JWT decoder: shows the header and payload of a token.
• Regex tester: runs a pattern against sample text and shows the matches.
• UUID generator: creates version 4 or version 7 identifiers.
• CSV to JSON converter: converts tabular data in both directions.
• Cron expression generator: builds a schedule and explains it in plain words.
• Robots.txt generator: writes the file and tests whether a URL is allowed.