Native HTTP post request sending null data

Ionic Native
1

Hi, while I’m trying to send a post request to the server from Ionic 4 reactive form data, I’m getting a response with status code 200. But when I try to fetch the details from the server, all are null values. I don’t understand where I’m doing a mistake.

I’ve tried with stringifying the object before sending to the server as well. But the same issue. Please let me know where I’ve mistaken. Thank You.

Client-side code:

uploadSendingRules() {
    const sendingRules = new SendingRules(this.sendingRulesForm.value.localSendBy,
      this.sendingRulesForm.value.nationalSendBy,
      this.sendingRulesForm.value.regionalSendBy,
      this.sendingRulesForm.value.internationalSendBy);
    this.saveSendingRules(sendingRules, this.authService.loggedUser.id);
  }

  async saveSendingRules(sendingRules: SendingRules, userId: number) {
    try {
      this.authService.showLoader('Updating Sending Rules...');
      const url = 'https:url-to-server/save-sending-rules';
      const params = {sendingRules, userId};
      const response = await this.http.post(url, params, this.authService.authHeaders);
      this.authService.hideLoader();
      alert(response.data);
    } catch (error) {
      this.authService.hideLoader();
      alert('error-->' + error.status);
      alert(error.data);
    }
  }

Server side code:

router.post('/v1/save-sending-rules',function(req,res){
        if(constants.DEBUG) console.log(req.body);
        SendConfRules.findOne({
                where : {
                    SRUL_VPUI_ID : req.body.userId
                },
                 order : [['SRUL_VPUI_ID','DESC']]
            }).then((confRules) => {
            if(confRules){
                confRules.update(dataObjects.sendingRules(req.body)).then((numRows) => {
                    res.json({
                        status : 200,
                        msg: "Rules updated"
                    });
                });
            }
            else{
                SendConfRules.create(dataObjects.sendingRules(req.body)).then(
                    (sendingRules) => {
                        res.json({
                        status : 200,
                        sendingRules : resSendingRules(confRules.dataValues)
                    });
                }).catch((err) => {logger.error(err)});
           }   
        }).catch((err) => {logger.error(err)});

    });