How do I send error message from server to client?

Question

I'm making some requests from my express server, and I'm wondering how I can pass an error message to the client side. I want to be able to see the error message when I console log from the client as well as from the server, but I'm not sure how to relay this message back to the client to make that possible.

Here is an example of a request from my server.js file

app.get('/assign*', (request, response) => {
    var baseurl = 'https://OURACC.nocrm.io/api/v2/'
    var apikey = crmkey;

    var pathname = request.url; // retrieves the requested pathname (ie, /crm/path)
    pathname = pathname.split('?');
    pathname = pathname[0].split('/')
    var parameters = request.query.params;
    var path = pathname[2]; // gets request path for the crm

   var lead_id = parameters.lead_id
    var user_id = parameters.user_id

    var params = {
        user_id: user_id
    }

    if(path === 'leads'){

            axios.post(baseurl + path + '/' + lead_id + '/assign',
                params
            ,{
                headers: {'X-API-KEY': apikey, content_type: "json", accept: "application/json"} 
            }).then(function(res){
                response.send(res.data);
            }).catch(function(error){
                console.log("ERROR in /assign/leads/{id}/assign" + error);
            })

    }

})

This is what the call to this request looks like client side

 $.get('/assign/leads', {params: data}).then(response => {
                console.log(response);
            }).catch(error => {
                console.log(error);
            })

I've tried this server side

response.send(error)

but this doesn't return me anything client side like I was expecting.

I'm sure this is something simple, but I couldn't find much online about it, thanks.

Tsepo Nkalai · Accepted Answer · 2019-10-28 17:14:01Z

2

If I read your code correctly, just put response.send(yourErrorMessage) in the catch block

answered Oct 28, 2019 at 17:14

Tsepo Nkalai

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6 Comments

Michael Over a year ago

I feel like I tried this and nothing showed up in the console client side, but I can try again.

Tsepo Nkalai Over a year ago

@Michael ya, I just noticed you did. Debug your code to make sure that the "respond" variable you have there is the correct one

Tsepo Nkalai Over a year ago

@Michael i see that you want to get params from the request. I am not a pro at express so I dont know if you are doing it correctly. Visit this link expressjs.com/en/guide/routing.html and go to the params sections. They have something like app.get('/users/:userId/books/:bookId', function (req, res) { res.send(req.params) }) just swap in the error message into the res

Michael Over a year ago

The issue was because I wasn't doing response.send(error.message). By doing this I'm now getting the error message client side.

Tsepo Nkalai Over a year ago

Great! Glad to have been some sort of help :)

|

Denerator · Accepted Answer · 2019-10-28 17:13:36Z

0

You have to specify response code. For example:

res.status(400);
res.send('None shall pass');

answered Oct 28, 2019 at 17:13

Denerator

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