Friday 15 March 2024

How to update company name in employee array ? in MuleSoft 136

 How to update company name in employee array ? in MuleSoft

Here's how to update the company name within an employee array in MuleSoft 4:

Method 1: Using DataWeave:

DataWeave offers a powerful and concise approach for manipulating data within arrays. Here's how to achieve this:

%dw 2.0
// Sample employee array
var employees = [
  { name: "John Doe", company: "OldCompany" },
  { name: "Jane Doe", company: "OldCompany" }

// Update the company name for all employees
output = employees map (employee) -> {
  employee merge { company: "NewCompany" }; // Merge with updated company name


  1. Define a sample employee array (employees) containing objects with name and company properties.

  2. The map function iterates through each employee object in the array.

  3. Inside the map function:

  • The merge operator is used to combine the existing employee object with a new object containing the updated company name ("NewCompany").

  1. The resulting output array contains all employees with their company name updated to "NewCompany".

Method 2: Using MEL (Message Expression Language):

MEL provides a basic approach for manipulating objects within an array. Here's an example:


<foreach collection="#[payload]" doc:name="Employee Loop">
  <set-payload expression="#[payload merge { company: 'NewCompany' }]" doc:name="Update Company" />


  1. A foreach loop iterates through each element (payload) in the assumed employee array.

  2. Inside the loop:

  • A set-payload component uses an expression to update the current employee object.

  • The merge function (similar to DataWeave) combines the existing object with a new object containing the updated company name.

  1. The updated object is then sent to the output.

Choosing the Right Approach:

  • DataWeave: This is the recommended method due to its:

  • Readability

  • Conciseness

  • Ability to handle complex scenarios (updating based on conditions, modifying other properties)

  • MEL: While functional for simple updates, MEL expressions can become cumbersome for intricate object manipulation or conditional logic.

Additional Considerations:

  • Ensure the payload structure (array of objects) is compatible with the chosen method.

  • Error handling can be incorporated within DataWeave or MEL to gracefully handle cases where the array might be empty or the object structure differs.

Further Considerations:

  • DataWeave allows for updating specific elements within the array based on conditions. You can use filters within the map function to target specific employees for the update.

  • Consider using a dedicated processor like "Object to JSON" or "JSON to Object" if additional data transformation is required after the update.

Here are some helpful resources for further reference:

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