Following provides some operational info about connecting a Flutter Android/iOS client application and a NodeJs Jwt Authentication Server
Code links for an example Nodejs server and a corresponding Flutter application are also provided
To summarise, the server has to be reachable by the mobile application
During development, a server is typically run in some custom port other than a generic http (80) port or ssl (443) port
Local server can be run for it to be accessible over a local network like wifi
This allows an emulator/simulator or a device connected to the local network to be able to send requests to the server and receive response
Use ifconfig command in Linux/MacOs to get the ip address for local network
An ipv4 address is shown after inet in the commands output for an adapter
If connected to wifi, look for an adapter with prefix wlp like wlp2s0 or wlp4s0
ip address used in this example is 192.168.43.12 which is returned by ifconfig command
The server is to run on the ip address retrieved i.e 192.168.43.12 here
When run from the command line, the ip address is added as a parameter to the run command
nodejs index.js 192.168.43.12 This starts the Nodejs server which listens for any client in the address 192.168.43.12:4500
Assign a specific port, during server initialisation (in index.js)
const port = process.env.NODE_ENV === 'production' ? 80 : 4500;
// start server
const server = app.listen(port, function () {
console.log('Server listening on port ' + port);
});This can be a random unused port (most ports should be unused in a typical home computer)
Use netstat -tupln command to check for active ports
The corresponding Flutter application uses the ip address in a Http request in its code along with the port and specific path for an Api
Since provided example runs without ssl, the requests have to be sent using http protocol
final url = 'http://192.168.43.12:4500/users/authenticate';
await http.get(url, headers: headers)Check Flutter Application to connect to the server for mobile application code which works in Android and iOS
