PostgreSql或MongoDb用于从REST API接收的JSON数据

I'm creating a web application which will communicate with REST API which returns data in JSON. That data can be converted into relational data, of course, when I fetch it to store into a db which happens to be PostgreSql. But I'm thinking about using MongoDb instead because working with JSON is more natural for MongoDb.I'm creating a web application which will commu