What else can REST work with besides JSON?

REST is an architectural style for interaction between client and server, which is not limited to a data format. Besides JSON, REST can work with:

• XML — often used in legacy systems and integrations.
• YAML — convenient for configurations and human-readable data.
• HTML — for example, when the server returns web pages.
• Plain text — simple text format.
• Protobuf, MessagePack — binary formats for increased transmission efficiency.

The choice of format depends on requirements for compatibility, readability, and performance. In HTTP requests and responses, the format is specified in the Content-Type and Accept headers.