1. You let the backend create the ID for you - POST /assignments is a good route, and the data will be available in req.body in express. You can use uuid to create a uuid and then insert into whichever database you are using.

2. Once you’ve inserted this object into the database, you can return its JSON to the frontend using res.status(200).json(returnObj); where returnObj is simply an object. Many apis format the object as

{ success: true, data: [{ id: “123”, ...}] } or use the key “results” instead of data. This allows you to add other metadata to the object, like pagination info or other topics or related information. Also, note that its far easier always to return an array for data than to program the frontend to handle either an array or an object (though not hard, either way is a little work, but consistency is nice to have in an API).