Hello everyone, I’m new to app development and have developed an app following https://shopify.dev/apps/tools/cli/getting-started as front-end, the ui is working fine and is loading from localhost port 8081 via ngrok to Shopify, have also developed backend using node, express and mongoose, running fine on localhost 3000, but I’m unable to push data from front-end to backend, can someone pl. help at the earliest, I understand Shopify uses https://shopify.dev/apps/online-store/app-proxies but I’m unable to follow the same, my frontend code is as follows
import { useState, useCallback } from "react";
import { Button,Card,Form,FormLayout,TextField,} from "@shopify/polaris";
import Router from "koa-router";
const RegForm = () => {
const [serialNum, setSerialNum] = useState({});
const [isSubmitting, setIsSubmitting] = useState(false);
const [errors, setErrors] = useState({});
const router = Router();
const fetch = require("node-fetch");
const handleSubmit = useCallback(
(e) => {
e.preventDefault();
let errs = validate();
setErrors(errs);
setIsSubmitting(true);
async function post_request() {
const url = "http://localhost:3000/register";
let platform = "shopify";
const body = { serialNum, platform };
console.log(body);
const res = await fetch(url, {
method: "POST",
body: JSON.stringify(body),
headers: {
"Content-Type": "application/json",
'Accept': 'application/json',
"Access-Control-Allow-Origin": "*",
"Access-Control-Allow-Methods": "GET, POST"
},
}).catch((e) => {
console.log(e);
});
const data = await res.json(); //assuming data is json
console.log(data);
}
if (serialNum % 9 === 0) {
console.log(serialNum);
alert("Thank You");
try {
post_request();
} catch (error) {
console.log(error);
}
} else {
alert("Invalid Serial Number");
}
},
[serialNum]
);
const handleSerialChange = useCallback((value) => setSerialNum(value), []);
const breadcrumbs = [{ content: "Registration" }, { content: "next.js" }];
const primaryAction = { content: "New Registration" };
const validSerial = !serialNum
? "Please Provide Tally Serial Number"
: serialNum % 9 != 0
? "Please Provide Valid Tally Serial Number"
: "Thank you";
const validate = () => {
let err = {};
if (!serialNum) {
err.title = "Serial Number is Required";
} else if (serialNum % 9 != 0) {
err.title = "Invalid Serial Number";
} else {
err.title = "Thank you";
}
return err;
};
return (
);
};
export default RegForm;
and my backend code is as follows
const express = require("express");
const router = express.Router();
require("../db/conn");
const Registration = require("../models/registrationschema");
router.get("/", (req, res) => {
res.send("Server Router says Hello");
});
router.get("/register", (req, res) => {
res.send("just checking");
});
// with async await
router.post("/register", async (req, res) => {
const { serial, active, store_name, regdate, email } = req.body;
if (!serial || !active || !email) {
return res.status(422).json({ error: "Invalid registration details" });
}
if (serial % 9 !== 0) {
return res
.status(422)
.json({ error: "Invalid Serial Number, Please Check" });
}
try {
const userExists = await Registration.findOne({
serial: serial,
active: true,
});
if (userExists) {
return res.status(422).json({ error: "Serial Already Registered" });
}
const register = new Registration({
serial,
active,
store_name,
regdate,
email,
});
await register.save();
res.status(201).json({ message: "Serial Registered Successfully" });
} catch (err) {
console.log(err);
}
});
module.exports = router;
already tried proxy through package.json, didn’t work, please help at the earliest.