axios post request to send form data - reactjs

Question

axios POST request is hitting the url on the controller but setting null values to my POJO class, when I go through developer tools in chrome, the payload contains data. What am I doing wrong?
Axios POST Request:
var body = {
userName: 'Fred',
userEmail: 'Flintstone#gmail.com'
}
axios({
method: 'post',
url: '/addUser',
data: body
})
.then(function (response) {
console.log(response);
})
.catch(function (error) {
console.log(error);
});
Browser Response:
If I set headers as:
headers:{
Content-Type:'multipart/form-data'
}
The request throws the error
Error in posting multipart/form-data. Content-Type header is missing boundary
If I make the same request in postman it's working fine and sets values to my POJO class.
Can anyone explain how to set boundary or how can I send form data using axios.

Answer 1

You can post axios data by using FormData() like:
var bodyFormData = new FormData();
And then add the fields to the form you want to send:
bodyFormData.append('userName', 'Fred');
If you are uploading images, you may want to use .append
bodyFormData.append('image', imageFile);
And then you can use axios post method (You can amend it accordingly)
axios({
method: "post",
url: "myurl",
data: bodyFormData,
headers: { "Content-Type": "multipart/form-data" },
})
.then(function (response) {
//handle success
console.log(response);
})
.catch(function (response) {
//handle error
console.log(response);
});
Related GitHub issue:
Can't get a .post with 'Content-Type': 'multipart/form-data' to work # axios/axios

Answer 2

In my case I had to add the boundary to the header like the following:
const form = new FormData();
form.append(item.name, fs.createReadStream(pathToFile));
const response = await axios({
method: 'post',
url: 'http://www.yourserver.com/upload',
data: form,
headers: {
'Content-Type': `multipart/form-data; boundary=${form._boundary}`,
},
});
This solution is also useful if you're working with React Native.

Answer 3

Check out querystring.
You can use it as follows:
var querystring = require('querystring');
axios.post('http://something.com/', querystring.stringify({ foo: 'bar' }));

Answer 4

Upload (multiple) binary files
Node.js
Things become complicated when you want to post files via multipart/form-data, especially multiple binary files. Below is a working example:
const FormData = require('form-data')
const fs = require('fs')
const path = require('path')
const formData = new FormData()
formData.append('files[]', JSON.stringify({ to: [{ phoneNumber: process.env.RINGCENTRAL_RECEIVER }] }), 'test.json')
formData.append('files[]', fs.createReadStream(path.join(__dirname, 'test.png')), 'test.png')
await rc.post('/restapi/v1.0/account/~/extension/~/fax', formData, {
headers: formData.getHeaders()
})
Instead of headers: {'Content-Type': 'multipart/form-data' } I prefer headers: formData.getHeaders()
I use async and await above, you can change them to plain Promise statements if you don't like them
In order to add your own headers, you just headers: { ...yourHeaders, ...formData.getHeaders() }
Newly added content below:
Browser
Browser's FormData is different from the NPM package 'form-data'. The following code works for me in browser:
HTML:
<input type="file" id="image" accept="image/png"/>
JavaScript:
const formData = new FormData()
// add a non-binary file
formData.append('files[]', new Blob(['{"hello": "world"}'], { type: 'application/json' }), 'request.json')
// add a binary file
const element = document.getElementById('image')
const file = element.files[0]
formData.append('files[]', file, file.name)
await rc.post('/restapi/v1.0/account/~/extension/~/fax', formData)

Answer 5

2020 ES6 way of doing
Having the form in html I binded in data like so:
DATA:
form: {
name: 'Joan Cap de porc',
email: 'fake#email.com',
phone: 2323,
query: 'cap d\ou'
file: null,
legal: false
},
onSubmit:
async submitForm() {
const formData = new FormData()
Object.keys(this.form).forEach((key) => {
formData.append(key, this.form[key])
})
try {
await this.$axios.post('/ajax/contact/contact-us', formData)
this.$emit('formSent')
} catch (err) {
this.errors.push('form_error')
}
}

Answer 6

Using application/x-www-form-urlencoded format in axios
By default, axios serializes JavaScript objects to JSON. To send data
in the application/x-www-form-urlencoded format instead, you can use
one of the following options.
Browser
In a browser, you can use the URLSearchParams API as follows:
const params = new URLSearchParams();
params.append('param1', 'value1');
params.append('param2', 'value2');
axios.post('/foo', params);
Note that URLSearchParams is not supported by all browsers (see caniuse.com), but there is a polyfill available (make sure to polyfill the global environment).
Alternatively, you can encode data using the qs library:
const qs = require('qs');
axios.post('/foo', qs.stringify({ 'bar': 123 }));
Or in another way (ES6),
import qs from 'qs';
const data = { 'bar': 123 };
const options = {
method: 'POST',
headers: { 'content-type': 'application/x-www-form-urlencoded' },
data: qs.stringify(data),
url, };
axios(options);

Answer 7

Even More straightforward:
axios.post('/addUser',{
userName: 'Fred',
userEmail: 'Flintstone#gmail.com'
})
.then(function (response) {
console.log(response);
})
.catch(function (error) {
console.log(error);
});

Answer 8

import axios from "axios";
import qs from "qs";
const url = "https://yourapplicationbaseurl/api/user/authenticate";
let data = {
Email: "testuser#gmail.com",
Password: "Admin#123"
};
let options = {
method: "POST",
headers: { "content-type": "application/x-www-form-urlencoded" },
data: qs.stringify(data),
url
};
axios(options)
.then(res => {
console.log("yeh we have", res.data);
})
.catch(er => {
console.log("no data sorry ", er);
});
};

Answer 9

I had the similar issues when using FormData with axios to make calls on https://apps.dev.microsoft.com service and it error-red out with "The request body must contain the following parameter: 'grant_type'"
After reformatting the data from
{
grant_type: 'client_credentials',
id: '123',
secret: '456789'
}
to
"grant_type=client_credentials&id=123&secret=456789"
and the following code worked:
const config: AxiosRequestConfig = {
method: 'post',
url: https://apps.dev.microsoft.com/auth,
data: 'grant_type=client_credentials&id=123&secret=456789',
headers: {
'Content-Type': 'application/x-www-form-urlencoded',
}
};
axios(config)
.then(function (response) {
console.log(JSON.stringify(response.data));
})
.catch(function (error) {
console.log(error);
});

Answer 10

i needed to calculate the content length aswell
const formHeaders = form.getHeaders();
formHeaders["Content-Length"] = form.getLengthSync()
const config = {headers: formHeaders}
return axios.post(url, form, config)
.then(res => {
console.log(`form uploaded`)
})

Answer 11

A boundary (which is used, by the server, to parse the payload) is set when the request is sent. You can't obtain the boundary before making the request. So, a better way to get this is using getBoundary() from your FormData.
var formData = new FormData();
formData.append('userName', 'Fred');
formData.append('file0', fileZero);
formData.append('file1', fileOne);
axios({
method: "post",
url: "myurl",
data: formData,
headers: {
'Content-Type': `multipart/form-data; ${formData.getBoundary()}`,
})
.then(function (response) {
//handle success
console.log(response);
})
.catch(function (response) {
//handle error
console.log(response);
});

Answer 12

I needed to upload many files at once using axios and I struggled for a while because of the FormData API:
// const instance = axios.create(config);
let fd = new FormData();
for (const img of images) { // images is an array of File Object
fd.append('images', img, img.name); // multiple upload
}
const response = await instance({
method: 'post',
url: '/upload/',
data: fd
})
I did NOT specify the content-type: multipart/form-data header!

Answer 13

The above method worked for me but since it was something I needed often, I used a basic method for flat object. Note, I was also using Vue and not REACT
packageData: (data) => {
const form = new FormData()
for ( const key in data ) {
form.append(key, data[key]);
}
return form
}
Which worked for me until I ran into more complex data structures with nested objects and files which then let to the following
packageData: (obj, form, namespace) => {
for(const property in obj) {
// if form is passed in through recursion assign otherwise create new
const formData = form || new FormData()
let formKey
if(obj.hasOwnProperty(property)) {
if(namespace) {
formKey = namespace + '[' + property + ']';
} else {
formKey = property;
}
// if the property is an object, but not a File, use recursion.
if(typeof obj[property] === 'object' && !(obj[property] instanceof File)) {
packageData(obj[property], formData, property);
} else {
// if it's a string or a File
formData.append(formKey, obj[property]);
}
}
}
return formData;
}

Answer 14

For me it worked using axios, typescript and form-data(v4.0.0):
import FormData from "form-data";
import axios from "axios";
async function login() {
var data = new FormData();
data.append("User", "asdf");
const return = await axios.post(
"https://ptsv2.com/t/1q9gx-1652805776/post", data,
{ headers: data.getHeaders() }
);
console.log(return);
}

Answer 15

This should work well when needing to POST x-www-form-urlencoded data using axios from a NodeJS environment. You may need to add an Authorization header to the config.headers object if the endpoint requires authentication.
const config = {
headers: {
accept: 'application/json',
'cache-control': 'no-cache',
'content-type': 'application/x-www-form-urlencoded'
}
const params = new URLSearchParams({key1: value1, key2: value2});
return axios
.post(url, params.toString(), config)
.then((response) => {
return response.data;
})
.catch((error) => console.error(error));

Answer 16

In my case, the problem was that the format of the FormData append operation needed the additional "options" parameter filling in to define the filename thus:
var formData = new FormData();
formData.append(fieldName, fileBuffer, {filename: originalName});
I'm seeing a lot of complaints that axios is broken, but in fact the root cause is not using form-data properly. My versions are:
"axios": "^0.21.1",
"form-data": "^3.0.0",
On the receiving end I am processing this with multer, and the original problem was that the file array was not being filled - I was always getting back a request with no files parsed from the stream.
In addition, it was necessary to pass the form-data header set in the axios request:
const response = await axios.post(getBackendURL() + '/api/Documents/' + userId + '/createDocument', formData, {
headers: formData.getHeaders()
});
My entire function looks like this:
async function uploadDocumentTransaction(userId, fileBuffer, fieldName, originalName) {
var formData = new FormData();
formData.append(fieldName, fileBuffer, {filename: originalName});
try {
const response = await axios.post(
getBackendURL() + '/api/Documents/' + userId + '/createDocument',
formData,
{
headers: formData.getHeaders()
}
);
return response;
} catch (err) {
// error handling
}
}
The value of the "fieldName" is not significant, unless you have some receiving end processing that needs it.

Answer 17

https://www.npmjs.com/package/axios
Its Working
// "content-type": "application/x-www-form-urlencoded",
// commit this
import axios from 'axios';
let requestData = {
username : "abc#gmail.cm",
password: "123456"
};
const url = "Your Url Paste Here";
let options = {
method: "POST",
headers: {
'Content-type': 'application/json; charset=UTF-8',
Authorization: 'Bearer ' + "your token Paste Here",
},
data: JSON.stringify(requestData),
url
};
axios(options)
.then(response => {
console.log("K_____ res :- ", response);
console.log("K_____ res status:- ", response.status);
})
.catch(error => {
console.log("K_____ error :- ", error);
});
fetch request
fetch(url, {
method: 'POST',
body: JSON.stringify(requestPayload),
headers: {
'Content-type': 'application/json; charset=UTF-8',
Authorization: 'Bearer ' + token,
},
})
// .then((response) => response.json()) . // commit out this part if response body is empty
.then((json) => {
console.log("response :- ", json);
}).catch((error)=>{
console.log("Api call error ", error.message);
alert(error.message);
});

Answer 18

transformRequest: [
function(data, headers) {
headers["Content-Type"] = "application/json";
return JSON.stringify(data);
}
]
try this, it works