Translation files
File formats for importing and exporting translations are broadly the same, but there are some slight differences. See:
For help with specific translation file formats, see the general help section for your platform.
JSON responses
All other API endpoints produce only JSON.
JSON output is beautified by default, but you can append ?ugly to the query string to produce a single line of output.
If your JSON parser expects slashes to be escaped as \/ or requires Unicode escape sequences like \u00a3 then use the ugly option to enable compatibility.
It's not mandatory to append .json to API URIs, but adding it is good practice.
When path arguments contain unescaped dots they can be confused with the required file format if it hasn't been specified.