I am waiting for successful JSON from server:
{"...."}
Actual Behavior
I get
SyntaxError: Unexpected token b in JSON at position 0
b is the first letter of word "badlogin". It responds server when sent wrong combination of userName and password. But when I use Postman with the same key values combination on the same address I get correct rosponse from the server.
Steps to Reproduce
fetch('http://....', {
method: 'POST',
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json',
},
body: JSON.stringify({
userName: "react",
password: "123",
})
}).then((response) => response.json())
.then((responseJson) => {
console.log(responseJson.message);
if(responseJson.success === true) {
alert('successufuly loged');
}
else{
console.log(responseJson.message);
alert(responseJson.message);
}
})
}
}
You are trying to parse a string. This is the error. Instead of always parse the json, just add a clausule to check if the request was made with success
}).then((response) => {
if(!response.ok) {
// handle your error here and return to avoid to parse the string
return
}
return response.json()
})
.then()
Look like the response you got is not json
Try to check what is the response you are getting first:
.then((response) => response.text())
.then((responseJson) => {
console.log(responseJson);
}
I solved this issue by using FormData to prepare data for sending:
......
login = () => {
var formData = new FormData();
formData.append('username', 'react');
formData.append('password', '123');
fetch('http://......', {
method: 'POST',
body: formData
........
Related
`I am using fetch on react native to send a post request with a form data object on the body.
This code works on iOS but on android it returns a 400 BAD REQUEST and I get ERROR [SyntaxError: JSON Parse error: Unexpected EOF].
const buildFormData = () => {
const data = new FormData();
for (let i = 0; i < photoForm.photosToUpload.length; i++) {
console.log(photoForm.photosToUpload[i].uri)
data.append('photosToUpload', {
uri: photoForm.photosToUpload[i].uri,
name: photoForm.photosToUpload[i].fileName,
type: 'image/jpeg'
});
data.append("userForm", JSON.stringify(userForm));
console.log(data)
return data;
}
This is how I am building my form data.
export const createUser = (formData) => async (dispatch) => {
try {
const headers = {
'Content-Type': 'multipart/form-data'
};
const response = await fetch('https://c66d-2a02-a03f-a5a1-e400-1573-78c6-e019-e601.eu.ngrok.io' + '/create_user', {
method: 'POST',
headers: {
Accept: 'application/json',
'Content-Type': 'multipart/form-data',
},
body: formData,
})
.then(response => response.json())
.then(responseJson => {
console.log(responseJson);
})
.catch(error => {
console.error(error);
});
Handle successful response
catch (error) {
Handle error
}
This is how I am sending the form data to my django server. I know the problem is in the form data because if I dont send files the request goes through.
I have read almost every github issue on this matter, switched to axios, tried multiple solutions and no luck. Does anyone know what the problem can be?
I tried to make a post request using fetch and it works on iOS but not on android.
I was expecting to work on both OS.`
As i am trying to send my data in form of body in backed url as in backed i have made something if it dont receive body it will send sucess: false, msg: haven't received body else sucess: true, msg: jwt token as if i make request from post man with same data it's working but sending via. native app it fails to send.. any help will be helpfull
As 1st request is from postman and 2nd from my app
const handleLogin = (Enrno, Pass) => {
setError(null);
setIsLoaded(false);
setItems([]);
fetch(config.url + "/login", {
method: "POST",
header : {
Accept : 'application/json',
'Content-Type' : 'application/json'
},
body : JSON.stringify({
"enrno": Enrno,
"password" : Pass
})
})
.then((res) => res.json())
.then(
(result) => {
setIsLoaded(true);
setItems(result);
alert(items[0].msg);
},
(error) => {
setIsLoaded(true);
setError(error);
}
);
};
I think you need to put these to headers, not header.
Accept : 'application/json',
'Content-Type' : 'application/json'
So, it should look like this.
fetch(config.url + "/login", {
method: 'POST',
headers: {
Accept: 'application/json',
'Content-Type': 'application/json'
},
body: JSON.stringify({
enrno: Enrno,
password : Pass
})
})
I want to upload a file using Axios but for that I need to use formData, my problem is that when I am using formData the data are not send at all.
Here is my code without formData, its working fine all the data are sent :
axios({
method: 'post',
url: jsonurl,
data: {
session_id: '123',
},
headers: {
'Content-Type': 'multipart/form-data',
}
})
.then((value) => {
console.log(value); // return in console : status 200 and config: data: session_id: "123" ...
})
.catch(err=>console.error(err));
Same code with formData (no data sent, $_GET['id'] doesnt exist) :
const formData = new FormData();
formData.append('session_id', '123');
axios({
method: 'post',
url: jsonurl,
formData,
headers: {
'Content-Type': 'multipart/form-data',
}
})
.then((value) => {
console.log(value); // return in console : status 200 but config: data: FormData {}
})
.catch(err=>console.error(err));
No data sent, return in console status 200 but config: data: FormData {} (so no data) and on backend $_POST['session_id'] doesnt exist, the form is sent (I get my jsonencode return) but there is no input data.
I dont catch any error either.
Finally I found the solution, my syntax was wrong, here is one who works :
var postResults = await axios.post(jsonurl,
formData,
{
headers: {
'Content-Type': 'multipart/form-data'
}
}
)
.then(function(value){
console.log(value);
return value;
})
.catch(function(error){
console.log(error);
});
in my react-native application, I'm trying to make fetch request with body. But, I get error message of unexpected EOF. Actually, the request is made, I mean I can see through backend logs that request is sent, whereas, right after the request, it shows error message.
Here is my fetch method.
var Url = "https://----------";
return fetch(Url, {
method: "POST",
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json'
},
body: JSON.stringify({'number': '11111111-'})
})
.then((response) => response.json())
.then((responseJson) => {
console.log("SEND_SMS RESULT: ",responseJson);
})
.done();
here is the error screen I get.
I would say that it fails on this line: response.json()
Are you sure that your response is a valid JSON?
Try testing the response with Postman or add .catch(e => console.log(e)) before done();
var Url = "https://----------";
return fetch(Url, {
method: "POST",
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json'
},
body: JSON.stringify({'number': '11111111-'})
})
.then((response) => response.text())
.then((responseJson) => {
const resposeJson2 = responseJson.length ? JSON.parse(responseJson) : {};
console.log("SEND_SMS RESULT: ",responseJson2);
})
.done();
Your server is returning null instead of error and unfortunately response.json() cant operate on null response
you can research briefly on it the keywords are "Handling null response from api"
I'm new with react-native. I'm trying to satisfy the devise_token_auth requirement of send in every request the authetication headers. To do so, I'm trying something like this:
export const scheduleFetch = (auth) => {
return (dispatch) => {
fetch(URL, {
method: 'GET',
headers: {
'Content-Type': 'application/json; charset=utf-8',
'access-token': auth['acessToken'],
'token-type': auth['tokenType'],
'client': auth['client'],
'uid': auth['uid']
}
})
.then((response) => {
console.log(response)
response.json()
})
.catch((error) => console.log(error))
}
}
My back-end is receiving the request, all headers are fill. However, I still receiving the message "_bodyText":"{\"errors\":[\"You need to sign in or sign up before continuing.\"]}".
How can I make that work? Am I jumping any step?