how to fetch api(POST) with header in react native app - json

Question

I am trying to put three params in my post request to particular api but i didn't get the response as i expected. API works fine in my Postman but i am not sure about my fetching method in my react native app i am new to this so i don't know how to put headers in my api request i followed some docs but didn't get much please have a look and answer my question.
constructor (props) {
super (props)
this.state = {
detail: ''
}
}
ComponentDidMount(){
var data = new FormData();
data.append('mobile_number','8615351655')
data.append('mobile_country_code','+21')
data.append('rec_name','Shantanu Talwaar')
}
fetchData = async() => {
fetch('http://link.com/link/',
{
method: 'POST',
headers:{
//this what's exactly look in my postman
'Authorization': 'Token 97a74c03004e7d6b0658dfdfde34fd6aa4b14ddb;
},
body: this.data
})
.then((response) => response.json())
.then((responseJson) => {
alert(responseJson.detail)
}).catch((error) => {
alert('error')})}
render() {
return (
<View style = {styles.container}>
<Button onPress = {this.fetchData} title = "fetch"/>
<Text style={styles.text}>Fetched data displays below</Text>
<Text style={styles.text}>{this.state.detail}</Text>
</View>
)
}
}
This is the result i am having right now in my alert box: "Authentication credentials were not provided."

Answer 1

There is a ' missing after your token.
'Authorization': 'Token 97a74c03004e7d6b0658dfdfde34fd6aa4b14ddb;
And as it is a JSON Object you should remove the semi-colon
So, the final code will be
'Authorization': 'Token 97a74c03004e7d6b0658dfdfde34fd6aa4b14ddb'
There is also another problem. The data declaration is not accessible from the fetch function. So you should do something like this.
fetchData = async() => {
var data = new FormData();
data.append('mobile_number','8615351655')
data.append('mobile_country_code','+21')
data.append('rec_name','Shantanu Talwaar')
fetch('http://link.com/link/',
{
method: 'POST',
headers:{
//this what's exactly look in my postman
'Authorization': 'Token 97a74c03004e7d6b0658dfdfde34fd6aa4b14ddb'
},
body: data
})
.then((response) => response.json())
.then((responseJson) => {
alert(responseJson.detail)
}).catch((error) => {
alert('error')
})
}

Answer 2

i think you can use "x-access-token" as header name for authentication token and place Content-Type too.
fetchData = () => {
fetch('http://link.com/link/',
{
method: 'POST',
headers:{
'Content-Type': "application/json",
'x-access-token': 'Token 97a74c03004e7d6b0658dfdfde34fd6aa4b14ddb'
},
body: this.data
})
.then((response) => response.json())
.then((responseJson) => {
console.log(responseJson.detail)
}).catch((error) => {
alert('error')})
}