Flatten an object using lodash

Question

I have below this nested object

I need to create an array using this object containing keys. And if keys are object then it should use .d

Answer 1

You can create a recursive function (getSchema) that checks if a value (val) is an object (arrays included), iterate it with _.flatMap(), and collects the keys until it hits a value which is not an object. It then joins the collected keys and returns the string.

const getSchema = (val, keys = []) =>
  _.isObject(val) ? // if it's an object or array
    _.flatMap(val, (v, k) => getSchema(v, [...keys, k])) // iterate it and call fn with the value and the collected keys
    :
    keys.join('.') // return the joined keys

const invoiceObject = { "AllowIPNPayment": false, "AllowOnlinePayment": false, "AllowOnlineCreditCardPayment": false, "AllowOnlineACHPayment": false, "domain": "QBO", "sparse": false, "Id": "16", "SyncToken": "1", "MetaData": { "CreateTime": "2020-03-25T15:10:40-07:00", "LastUpdatedTime": "2020-03-26T11:06:49-07:00" }, "CustomField": [{ "DefinitionId": "1", "Name": "Crew #", "Type": "StringType" }], "DocNumber": "1007", "TxnDate": "2020-03-03", "CurrencyRef": { "value": "USD", "name": "United States Dollar" }, "LinkedTxn": [{ "TxnId": "32", "TxnType": "Payment" }], "Line": [{ "Id": "1", "LineNum": 1, "Description": "Custom Design", "Amount": 750, "DetailType": "SalesItemLineDetail", "SalesItemLineDetail": { "ItemRef": { "value": "4", "name": "Design" }, "UnitPrice": 75, "Qty": 10, "TaxCodeRef": { "value": "NON" } } }, { "Amount": 750, "DetailType": "SubTotalLineDetail", "SubTotalLineDetail": {} } ], "TxnTaxDetail": { "TotalTax": 0 }, "CustomerRef": { "value": "13", "name": "uiool" }, "CustomerMemo": { "value": "Thank you for your business and have a great day!" }, "SalesTermRef": { "value": "3" }, "DueDate": "2020-04-02", "TotalAmt": 750, "ApplyTaxAfterDiscount": false, "PrintStatus": "NeedToPrint", "EmailStatus": "NotSet", "BillEmail": { "Address": "uiikoool" }, "Balance": 450 }

const result = getSchema(invoiceObject)

console.log(result)

Without lodash, the main change is to use Object.entries() to get an array of [key, value] pairs, since Array.flatMap() can't iterate objects:

const getSchema = (val, keys = []) =>
  typeof val === 'object' && val !== null ? // if it's an object or array
    Object.entries(val) // get [key, value] pairs of object/array
      .flatMap(([k, v]) => getSchema(v, [...keys, k])) // iterate it and call fn with the value and the collected keys 
    :
    keys.join('.') // return the joined keys

const invoiceObject = { "AllowIPNPayment": false, "AllowOnlinePayment": false, "AllowOnlineCreditCardPayment": false, "AllowOnlineACHPayment": false, "domain": "QBO", "sparse": false, "Id": "16", "SyncToken": "1", "MetaData": { "CreateTime": "2020-03-25T15:10:40-07:00", "LastUpdatedTime": "2020-03-26T11:06:49-07:00" }, "CustomField": [{ "DefinitionId": "1", "Name": "Crew #", "Type": "StringType" }], "DocNumber": "1007", "TxnDate": "2020-03-03", "CurrencyRef": { "value": "USD", "name": "United States Dollar" }, "LinkedTxn": [{ "TxnId": "32", "TxnType": "Payment" }], "Line": [{ "Id": "1", "LineNum": 1, "Description": "Custom Design", "Amount": 750, "DetailType": "SalesItemLineDetail", "SalesItemLineDetail": { "ItemRef": { "value": "4", "name": "Design" }, "UnitPrice": 75, "Qty": 10, "TaxCodeRef": { "value": "NON" } } }, { "Amount": 750, "DetailType": "SubTotalLineDetail", "SubTotalLineDetail": {} } ], "TxnTaxDetail": { "TotalTax": 0 }, "CustomerRef": { "value": "13", "name": "uiool" }, "CustomerMemo": { "value": "Thank you for your business and have a great day!" }, "SalesTermRef": { "value": "3" }, "DueDate": "2020-04-02", "TotalAmt": 750, "ApplyTaxAfterDiscount": false, "PrintStatus": "NeedToPrint", "EmailStatus": "NotSet", "BillEmail": { "Address": "uiikoool" }, "Balance": 450 }

const result = getSchema(invoiceObject)

console.log(result)