* You need strict typing
* You need well defined numeric formats
* Message volume is high enough that the parsing costs of messages outweigh the savings on implementation time
* You cannot guarantee plain text messages won&#x27;t be managed in transit.<p>You can get around the strict typing by adopting a schema format, but then you have a tooling problem that all the languages you need to support may not support your chosen JSON schema format.<p>Other solutions such as protobufs exist and are far better for transmitting large amounts of binary data.