Axios Post Request to Send Form Data

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: ''
}

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.

Accepted Answer

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: '
    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(' querystring.stringify({ foo: 'bar' }));

Answer 4

Upload (multiple) binary files

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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:

Axios Post Request to Send Form Data

19 Answers

Upload (multiple) binary files

Must Read

Node.js

Sarah Jenkins