Form data is empty after sending it with Axios

Question

I'm sending an FormData from a VueJS application using Axios. The problem is that when I output the FormData it's empty. I've used the same method before when sending a file (I'm not sending a file now) and then the FormData shows the right data that I've append to it. The data I'm appending is of the type string.

Client Side

onUpload(): void {
      const fd = new FormData();
      fd.append("id", this.chosenRoute.id);
      fd.append("name", this.routeName);
      fd.append("description", this.routeDescription);
      fd.append("activity", this.activity);
      fd.append("preamble", this.preamble);
      axios.post('http://localhost:8080/editRoute', fd, {
      onUploadProgress: uploadEvent => {
        console.log('Upload Progress' + Math.round(uploadEvent.loaded / uploadEvent.total) * 100 + " %");
      }
    }).then(
      res => {
      console.log(res);
    });
  }

Server Side

app.post('/editRoute', function(req,res){
    console.log(req.body);
    const routeId = req.body.id;
    console.log(routeId);
    Route.findById(routeId, (err, route) => {
        res.set("Access-Control-Allow-Origin", "*");
        route.update(req.body);
    });
});

Answer 1

From axios documentation:

By default, axios serializes JavaScript objects to JSON.

So, you can't just pass a JS FormData object straight to the options of an axios call. If you must use FormData, see recommended methods here: https://www.npmjs.com/package/axios#using-applicationx-www-form-urlencoded-format

However, if, as you mention above, but what looks like key/value pairs, don't use FormData at all, but a regular JavaScript Object.

const body = {
    "id": this.chosenRoute.id.
    "name": this.routeName,
    "description": this.routeDescription,
    "activity": this.activity,
    "preamble": this.preamble
}

axios.post('http://localhost:8080/editRoute', body, ...