After reviewing the responses, I have come up with a new function that includes an additional parameter called path in the replacer call:
function replacerWithPath(replacer) {
const map = new Map();
return function (field, value) {
const pathname = map.get(this);
let path;
if (pathname) {
const suffix = Array.isArray(this) ? `[${field}]` : `.${field}`;
path = pathname + suffix;
} else {
path = field;
}
if (value === Object(value)) {
map.set(value, path);
}
return replacer.call(this, field, value, path);
}
}
// Implementation
function replacer(name, data, path) {
// ...
}
const jsonData = JSON.stringify(data, replacerWithPath(replacer));
ADDITIONAL FEATURE:
I have also developed a function for recursively iterating through an object and utilizing the replace function similar to JSON.stringify. By passing a third argument as true, undefined values and empty objects can be retained.
This function is useful for manipulating and disregarding values while traversing through an object, returning the updated object without converting it to a string.
function walkWith(obj, fn, preserveUndefined) {
const traverse = objPart => {
if (objPart === undefined) {
return;
}
let result;
// Implement logic for other types besides objects
for (const key in objPart) {
const val = objPart[key];
let modified;
if (val === Object(val)) {
modified = traverse(fn.call(objPart, key, val));
} else {
modified = fn.call(objPart, key, val);
}
if (preserveUndefined || modified !== undefined) {
if (result === undefined) {
result = {};
}
result[key] = modified;
}
}
return result;
};
return traverse(fn.call({ '': obj }, '', obj));
}
EXTRA FEATURE 2:
This functionality is utilized for transforming a form submission's data object, which may include files or arrays of files, into a multipart format containing both files and JSON data.
function toMixedMultipart(data, bodyKey = 'data', form = new FormData()) {
const customReplacer = (name, value, path) => {
// Handle individual Blob
if (value instanceof Blob) {
form.append(path, value);
return undefined;
}
// Deal with array of Blobs
if (Array.isArray(value) && value.every(v => (v instanceof Blob))) {
value.forEach((v, i) => {
form.append(`${path}[${i}]`, v);
});
return undefined;
}
return value;
};
const jsonData = JSON.stringify(data, replacerWithPath(customReplacer));
const dataBlob = new Blob([jsonData], { type: 'application/json' });
form.append(bodyKey, dataBlob);
return form;
}