如何在nodejs中发送响应错误代码

Question

I would like to know how to send error code in promise as response in nodejs. Error in Promise Not sending any error in response object in NodeJS/Express

module.exports.providerData = function (reqUrl, query) {
  return new Promise(async function (resolve, reject) {
    try {
      var validUrl = checkValidParamters(reqUrl, query);
      if(validUrl != true){
       throw new Error('failed');
      }
      else{
        sendcountry = countryjson.filter(function (send) {
          return send.country_name == param_sendcountry;
        })
        var provider_sendcncode = sendcountry[0].country_code;
        var receive = countryjson.filter(function (pr) {
          return pr.country_name == param_receivecountry;
        })
        var valid = true;
        var valid_obj = { validstatus: valid};
        resolve(valid_obj);
      }
    }
    catch (err) {
     reject(err);
    }
  });

}

in app.js

router.get('/', function (req, res, next) {
  if (getcountries == null && getcurrencies == null && getproviders == null) {
            util.providerData(req.originalUrl, req.query).then(obj => {
              res.render("corridor.ejs");
            }).catch(err=>{
              res.status(401).send({ error : err.message });
            })
  }
  else {
    console.log('just return');
          util.providerData(req.originalUrl, req.query).then(obj => {
              res.render("corridor.ejs");
            }).catch(err=>{
              res.status(401).send({ error : err.message });
            })
  }
});

I need to catch the error response res.status(401).send({ error : err.message }); if export function is returning false/error

Answer 1

your promise doesn't resolve anything. to resolve, you just simple return your response.

router.get('/', function (req, res, next) {
   if (getcountries == null && getcurrencies == null && getproviders == null) {
        return util.providerData(req.originalUrl, req.query).then(obj => {
          return res.render("corridor.ejs");
        }).catch(err=>{
          return res.status(401).send({ error : err.message });
        })
  }
    else {
       console.log('just return');
       return util.providerData(req.originalUrl, req.query).then(obj => {
          return res.render("corridor.ejs");
        }).catch(err=>{
          return res.status(401).send({ error : err.message });
        })
  }
});