JavaScript Code by Pabbly

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You may expand the functionality of your Pabbly Connect workflow by using the most widely used web programming language, Javascript, with Code by Pabbly: JavaScript action.

Some example use cases include:
  • Date transformations or data type conversions.
  • Use custom regular expressions to extract data like emails or tracking numbers from large text blobs.
  • Make an extra API call to a different service with fetch without building a full dev app.
  • Execute Javascript functions and relevant code.
Warning - This step involves programming, so beware! To use this, you probably need to be a coder, though you are welcome to play about with it. There is no technical help for errors in your code!

Note: The environment is Node.js v18.x which runs AWS SDK for JavaScript v3. Your code can only run for a limited amount of time i.e. up to 25 seconds and within a limited amount of memory i.e. up to 128MB. If you exceed those limits - your script will be killed.

1. Variable and Function Declarations

Inside Code by Pabbly: JavaScript module, you can declare the variables as you do in JavaScript basic programming using `let`, `const`, `var` depending upon your need.
  • Your code will be wrapped in an async function.
  • The wrapper function has some pre-defined constants, namely CryptoJS, _, and moment and pre-defined variables namely, output.
  • You can use await keyword if required.

Here is a sample JavaScript code with which, you can get the idea of using variables and performing operations on them to return the desired output.

//initializing variables
let data = {
 "first_name": "Pabbly", "last_name": "Connect", "invoice_id": 123456, "total_price": 55.50, "line_items": [ { "product_id": 123, "name": "world", "price": 5.50 }, { "product_id": 234, "name": "planet", "price": 11.00 } ] };

let lineItems = data.line_items;
let totalPrice = 0;

//Javascript loop
for (let i = 0; i < lineItems.length; i++) {
  totalPrice += lineItems[i].price;

//Output or returning result
return JSON.stringify({"totalPrice":totalPrice});

Check the below screenshot of executing the above code


2. Returning Statements:

You can bind the resulting statement of the code either to the `output` variable or simply using the `return` statement as shown in the example:
The variable output has already been declared in the wrapper function.

output = JSON.stringify({"totalPrice":totalPrice});

return JSON.stringify({"totalPrice":totalPrice});

3. Introductory Logging Example
The following console methods are available for logging purposes: log, warn, error and debug.
let name = "john";

if (name != "") {
console.log('got name!', name);

return {id: 1234, hello: 'world!', name: name};


4. Mathematical Expression - Divide by Five
let num = 125;
return {
  result: Number(num)/5


5. Using Regex to Extract emails from given string
let string = "Here are the emails [email protected], [email protected] and [email protected]";
return {
  Emails: (string.match(/([\w._-][email protected][\w._-]+\.[\w._-]+)/gi) || [])[0]


6. fetch()
The Fetch API provides a JavaScript interface for accessing and manipulating parts of the protocol, such as requests and responses. It also provides a global fetch() method that provides an easy, logical way to fetch resources asynchronously across the network.

GET API Call Example
//Defining headers
var myHeaders = new Headers();

//Initializing header with required values like, API Key, Content type etc.
myHeaders.append("X-API-Key", "HE48Q2LUVB6OXXXXXX5BARMGUSHS");
myHeaders.append("X-Account-Name", "MyAccount");

var requestOptions = {
method: 'GET',
headers: myHeaders,
redirect: 'follow'

//Return statement with fetch function
return fetch("[email protected]",
requestOptions) .then(response => response.json()) .then(result => .catch(error => console.log('error', error));


POST API Call Example

//Defining headers
var myHeaders = new Headers();

//Pass specific headers if required like, API Key, Token, Content Type etc..
myHeaders.append("x-api-key", "XLgggHyhde887887");
myHeaders.append("Content-Type", "application/json");

//API request body JSON payload
var raw = JSON.stringify({
"name": "John Doe",
"email": "[email protected]",
"phone": "877878898"

var requestOptions = {
method: 'POST',
headers: myHeaders,
body: raw, redirect: 'follow'

//Return statement with fetch function
return fetch("", requestOptions) .then(response => response.text()) .then(result => result) .catch(error => console.log('error', error));


7. Available JavaScript libraries with Examples

- CryptoJS
CryptoJS is a growing collection of standard and secure cryptographic algorithms like, MDF, SHA1, SHA2, AES, HMAC, etc. implemented in JavaScript using best practices and patterns.

//initialize varaibales
var public_api_key = "7e151e4060d6497111ed15565351b4332";
var secret_key = "8ad52a1d5d619835566a3848f3a6edg";

//Getting current timestamp
var timestamp = Math.floor(new Date().valueOf()/1000);

//Calculating hash HMAC using CryptoJs
var hash = CryptoJS.HmacSHA1(public_api_key + timestamp, secret_key);

//Returning the output
return {
"public_api_key":public_api_key, "timestamp":timestamp, "hash":hash.toString()


- Moment.js
A JavaScript date library for parsing, validating, manipulating, and formatting dates.
let now = moment().format('LLLL');
let locale = moment.locale();
let format = moment("10/08/2022").format("MM-DD-YYYY");
let day = moment("2022-10-08").format("dd");

output = {


- Lodash
Lodash is a JavaScript library that works on the top of underscore.js. It helps in working with arrays, strings, objects, numbers, etc. It provides us with various inbuilt functions and uses a functional programming approach which that coding in JavaScript easier to understand because instead of writing repetitive functions, tasks can be accomplished with a single line of code.

var users = [
{ 'user': 'barney', 'age': 36, 'active': true },
{ 'user': 'fred', 'age': 40, 'active': false }

// the `_.matches` iteratee shorthand.
return _.filter(users, { 'age': 36, 'active': true });



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