Note: Total Ionic newbie here.
I have the following:
- Ionic 5 (Capacitor) app with Angular 11.
- Express backend (localhost:3000)
I can fetch data from an API call and display in the browser, but not on the emulated Android device. I don't know how to check for console errors in Android Studio.
This image can explain the situation better.
I think this is due to CORS. I tried to follow the Ionic page on this but no resolution.
Here is my Express code:
const express = require("express");
const cors = require("cors");
const app = express();
const port = 3000;
const allowedOrigins = [
"capacitor://localhost",
"ionic://localhost",
"http://localhost",
"http://localhost:8080",
"http://localhost:8100",
"http://192.168.2.25:8100",
];
// For parsing JSON in request body
app.use(express.json());
// MySQL connection details - for POC sake.
// In PROD, these are typically saved in .env variables
// Ref: https://www.linkedin.com/pulse/storing-database-credentials-securely-siddhesh-jog
var mysql = require("mysql");
var connection = mysql.createConnection({
host: "____________________________.us-east-2.rds.amazonaws.com",
user: "admin",
password: "*****************",
database: "poc",
});
const corsOptions = {
origin: (origin, callback) => {
if (allowedOrigins.includes(origin) || !origin) {
callback(null, true);
} else {
console.log(origin);
callback(new Error("Origin not allowed by CORS"));
}
},
};
// Enable preflight requests for all routes
app.options("*", cors(corsOptions));
// Connect to MySQL
connection.connect(function (err) {
if (err) throw err;
console.log("Connected!");
});
// Dashboard - GET
app.get("/dashboard", cors(corsOptions), (req, res) => {
rows = [];
connection.query(
"select label_id, value from poc_fct",
function (err, result) {
if (err) throw err;
res.json(result);
}
);
});
app.listen(port, () => {
console.log(`CORS-enabled web server listening at http://localhost:${port}`);
});
Any help will be greatly appreciated.
