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 conta

Answer 1

Check out querystring.

You can use it as follows:

var querystring = require('querystring');
axios.post('http://something.com/', querystring.stringify({ foo: 'bar' }));

Answer 2

You can post axios data by using [FormData()][1] 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);
    });

You can read more here -

https://developer.mozilla.org/en-US/docs/Web/API/FormData https://github.com/axios/axios/issues/318

Answer 3

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() }

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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)