Alert function in react native - php

Question

I have set an alert message on the api script but when it successful run on the frontend wont be able to prompt the alert successful message
here my code, this is the frontend code which expected to return the message from the server
fetch(InsertAPIURL, {
mode:'no-cors',
method: 'POST',
headers: headers,
body: JSON.stringify(Data)
})
.then((response) =>response.json())
.then((responseJson)=>{
Alert.alert(responseJson);
}).catch((error) => {
console.error("Error"+error);
})
here is the backend script code
$register = mysqli_query($CN, $insertuserid);
if ($register) {
$Message = "Member has been registered successfully";
$EncodedData=json_encode($Message);
echo $EncodedData;
}
else {
echo "Server Error... please try latter";
}
after execute the data successful insert into the server but it wont prompt anything hope u guys help, thanks in advance

Answer 1

Backend Php: you write the following below:
//backend php
if(ok){
echo json_encode(array("success"=>1,"messsage"=>"successfully"));
}
else{
echo json_encode(array("success"=>0,"messsage"=>"Error Register"));
}
//frontEnd React
fetch(URL,options).then(res=>res.json()).then(result=>{
if(result.success===1){
//write code successfully
Alert.
}
else{
//write code error register
Alert.
}
});

Answer 2

Alert Doc: https://reactnative.dev/docs/alert#alert
static alert(title, meesage?, buttons?, options?)
Parameters:
NAME
TYPE
DESCRIPTION
title
string
The dialog's title. Passing null or empty string will hide the title.
message
string
An optional message that appears below the dialog's title.
buttons
Buttons
An optional array containing buttons configuration.
options
Options
An optional Alert configuration for the Android.
You can only use string, null, and empty type in the title.
responseJSON is not valid type.
fetch(InsertAPIURL, {
mode:'no-cors',
method: 'POST',
headers: headers,
body: JSON.stringify(Data)
})
.then((response) =>response.json())
.then((responseJson)=>{
Alert.alert(responseJson);
}).catch((error) => {
console.error("Error"+error);
})
to
fetch(InsertAPIURL, {
mode:'no-cors',
method: 'POST',
headers: headers,
body: JSON.stringify(Data)
})
.then((response) =>response.json())
.then((responseJson)=>{
Alert.alert(JSON.stringify(responseJson));
}).catch((error) => {
console.error("Error"+error);
})