Getting UnhandledPromiseRejectionWarning error while performing with axios on Nodejs - node.js

Question

I used nested request by using axios. Initially requesting POST request for the token with key/secrets and then trying to get results in following GET request by using previous request's token.
var config = {
method: 'post',
url: gsecConfig.tokenUrl,
headers: {
'Content-Type': 'application/x-www-form-urlencoded'
},
data: data
};
axios(config)
.then(function (response) {
if (response.data.access_token) {
const config = {
headers: { Accept: 'application/json', Authorization: `Bearer ${response.data.access_token}` }
};
axios.get(gsecConfig.gsecUrl + gsecid, config)
.then(function (response) {
let supplierData = response.data;
res.status(200).json({
"data": supplierData
});
}).catch(function (error) {
res.status(error.response.status || error.response).json({
"errors": [error.response.data]
});
});
}
})
.catch(function (error) {
res.status(error.response.status || error.response).json({
"errors": [error.response.data]
});
});
while running the application getting below errors.
(node:32) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'status' of undefined
at /whitelist-v1/nodejs/routes/gsec.js:47:39
at process._tickCallback (internal/process/next_tick.js:68:7)
(node:32) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2)
(node:32) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Answer 1

It's highly likely your error doesn't have a .response member, making error.response.status failing. Errors may be decorated with .response only if they originate from the network - the standard Error object doesn't declare it.
So both catches should probably be more like:
res.status(error.response && error.response.status || 500).json({
"errors": [error.response && error.response.data || error.message]
});
If it's not error.response that yields an undefined, then your res is undefined, which should be more obvious to catch.