JSON is a lightweight markup language widely used for exchanging and storing structured data. Many websites provide APIs that return JSON data -- GitHub, Google Maps, and Wikidata to name a few. Jq provides a tool for slicing, filtering, mapping, and transforming JSON data similar to the sed, awk, and grep command-line utilities. The jq tutorial uses the GitHub API to produce summary information about recent changes to jq itself. Users can experiment with jq on their own data before downloading it using the 'Try online!' section of the website. Jq is free software, licensed under the MIT license, with source code available on GitHub. Executables are available for Windows, macOS, and Linux.