'未定义' object 使用 MongoDB + Express

Question

When I print client-side the received object on console using console.log(this.data) , I get undefined , so I cannot access data.body to print the data stored on the database. Printing server-side gets the correct json object.

I'm sending the object using HTTP status 200. Forcing a Bad Request ( res.status(400).json(docs); ) will print correctly the json body inside an Error.

client.ts

getEvents() {
    return new Promise(resolve => {
      this.http.get('http://www.mywebsite.com:8080/api/objects')
      .pipe(map(data => { })).subscribe(data => {
          this.data = data;
          console.log(this.data);
      });
    });   
}

server.js

app.get("/api/objects", function (req, res) {
    db.collection(COLLECTION).find({})
    .toArray(function (err, docs) {
      if (err) {
        handleError(res, err.message, "Failed.");
      } else {
        console.log(docs);
        res.status(200).json(docs);
      }
    });
  });

Answer 1

Make sure you're using some kind of body-parser, as the body-parser or express.json():

app.use(express.json())

Put that before your routes!