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formDataToJSON.js
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Fri, Jan 24, 06:45

formDataToJSON.js
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'use strict';
import utils from '../utils.js';
/**
* It takes a string like `foo[x][y][z]` and returns an array like `['foo', 'x', 'y', 'z']
*
* @param {string} name - The name of the property to get.
*
* @returns An array of strings.
*/
function parsePropPath(name) {
// foo[x][y][z]
// foo.x.y.z
// foo-x-y-z
// foo x y z
return utils.matchAll(/\w+|\[(\w*)]/g, name).map(match => {
return match[0] === '[]' ? '' : match[1] || match[0];
});
}
/**
* Convert an array to an object.
*
* @param {Array<any>} arr - The array to convert to an object.
*
* @returns An object with the same keys and values as the array.
*/
function arrayToObject(arr) {
const obj = {};
const keys = Object.keys(arr);
let i;
const len = keys.length;
let key;
for (i = 0; i < len; i++) {
key = keys[i];
obj[key] = arr[key];
}
return obj;
}
/**
* It takes a FormData object and returns a JavaScript object
*
* @param {string} formData The FormData object to convert to JSON.
*
* @returns {Object<string, any> | null} The converted object.
*/
function formDataToJSON(formData) {
function buildPath(path, value, target, index) {
let name = path[index++];
const isNumericKey = Number.isFinite(+name);
const isLast = index >= path.length;
name = !name && utils.isArray(target) ? target.length : name;
if (isLast) {
if (utils.hasOwnProp(target, name)) {
target[name] = [target[name], value];
} else {
target[name] = value;
}
return !isNumericKey;
}
if (!target[name] || !utils.isObject(target[name])) {
target[name] = [];
}
const result = buildPath(path, value, target[name], index);
if (result && utils.isArray(target[name])) {
target[name] = arrayToObject(target[name]);
}
return !isNumericKey;
}
if (utils.isFormData(formData) && utils.isFunction(formData.entries)) {
const obj = {};
utils.forEachEntry(formData, (name, value) => {
buildPath(parsePropPath(name), value, obj, 0);
});
return obj;
}
return null;
}
export default formDataToJSON;

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