JSON

http://www.json.org/

Javascript Object Notation

Developed by Douglas Crockford, of Javascript: The Good Parts fame

Hip alternative to XML for data sharing.

Example: http://www.archive.org/details/uso20110129?output=json

Some browsers automatically recognize JSON and provide helpful formatting. If not, there's probably a plugin to do that.

• https://addons.mozilla.org/en-US/firefox/addon/jsonview/

Command-line

jq is a nice command-line tool for JSON parsing on the command-line.