trying to fetch data from Mongo DB node js server to react-native using redux but when trying to fetch data by POST Man API testing tool it's working nicely on the other hand when trying to fetch this same data by react-native by redux its show me:
.
Unhandled promise rejection: TypeError: Network request failed error
.
Now I want to see what is wrong I did and why this error shows me in react-redux but not in the POST Man API Testing tool.
.
after trying so much time finally I find out why actually happen this type of error.

Basically, this error generates for uses of http://localhost:3000/api/houses this type of URL in the redux file.
.
to avoid this type of error we have to use (http://your IP address:3000/api/houses) instead of (http://localhost:3000/api/houses) this type of URL.
.
in my case to solve this error I go to my command prompt (CMD) or terminal and then type ipconfig its show me the IP address of my machine which is like the below screenshot:

and then I go to my redux action file and replace thsi line
const result = await fetch('http://localhost:3000/api/houses');
to
const result = await fetch('http://192.168.1.30:3000/api/houses');
this line

Note : here: 192.168.1.30 is my IP address
.
finally, it solved and I have found my expected result in terminal
.
so why terminal because I use 'console.log' that's why I got output on the terminal.
which is like below screen-shot

finally, my virtual device is run clearly its men virtual device does not show me any warning now.
which is like the below screen-shot

so to solve the
"Unhandled promise rejection: TypeError: Network request failed"
.
error in react-redux you have to use your machine IP instead of the browser URL: like http://your IP:3000/your API'
.
so I hope it will help all of you the internet, people
that's it
.
Happy Coding.
osman forhad
Mobile & Web Application Developer💻