Convert JS Object to form data

If you have an object, you can easily create a FormData object and append the names and values from that object to formData.

You haven't posted any code, so it's a general example;

var form_data = new FormData();for ( var key in item ) {    form_data.append(key, item[key]);}$.ajax({    url         : 'http://example.com/upload.php',    data        : form_data,    processData : false,    contentType : false,    type: 'POST'}).done(function(data){    // do stuff});

There are more examples in the documentation on MDN

With ES6 and a more functional programming approach @adeneo's answer could looks like this:

function getFormData(object) {    const formData = new FormData();    Object.keys(object).forEach(key => formData.append(key, object[key]));    return formData;}

And alternatively using .reduce() and arrow-functions:

const getFormData = object => Object.keys(object).reduce((formData, key) => {    formData.append(key, object[key]);    return formData;}, new FormData());

This function adds all data from object to FormData

ES6 version from @developer033:

function buildFormData(formData, data, parentKey) {  if (data && typeof data === 'object' && !(data instanceof Date) && !(data instanceof File)) {    Object.keys(data).forEach(key => {      buildFormData(formData, data[key], parentKey ? `${parentKey}[${key}]` : key);    });  } else {    const value = data == null ? '' : data;    formData.append(parentKey, value);  }}function jsonToFormData(data) {  const formData = new FormData();    buildFormData(formData, data);    return formData;}const my_data = {  num: 1,  falseBool: false,  trueBool: true,  empty: '',  und: undefined,  nullable: null,  date: new Date(),  name: 'str',  another_object: {    name: 'my_name',    value: 'whatever'  },  array: [    {      key1: {        name: 'key1'      }    }  ]};jsonToFormData(my_data)

jQuery version:

function appendFormdata(FormData, data, name){    name = name || '';    if (typeof data === 'object'){        $.each(data, function(index, value){            if (name == ''){                appendFormdata(FormData, value, index);            } else {                appendFormdata(FormData, value, name + '['+index+']');            }        })    } else {        FormData.append(name, data);    }}var formData = new FormData(),    your_object = {        name: 'test object',        another_object: {            name: 'and other objects',            value: 'whatever'        }    };appendFormdata(formData, your_object);