fetch post always pass null to the parameters - react-native

Question

There's a fetch post with "userid" as a parameter. I've tested the url and parameter in native android, it works there but here it doesn't take the parameter. It always sends the null value to "userid" parameter. Am I doing smthing wrong here?
fetch('http://zzz.com/zzz/api/battery/gpswithbattery', {
method: 'POST',
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json',
},
body: JSON.stringify({
userid: '404',
})
})
.then((response) => response.json())
.then((responseJson) => {
console.log(responseJson);
//return responseJson.message;
this.setState({
data: responseJson.message
})
})
.catch((error) => {
console.error(error);
});

Answer 1

I see no mistake you are doing here, and start using es7 syntax, as that'll be even cleaner and easy to find mistakes,
pro-tip: use prettier that'll make to look your code better.
const method = async () => {
const reponse = await fetch("http://zzz.com/zzz/api/battery/gpswithbattery", {
method: "POST",
headers: {
Accept: "application/json",
"Content-Type": "application/json"
},
body: JSON.stringify({
userid: "404"
})
});
const responseJson = await response.json();
this.setState({ data: responseJson.message });
};