How to remove the indentation from json output ? in MuleSoft
Here are two primary methods to remove indentation from the JSON output in MuleSoft 4:
Method 1: Using DataWeave:
DataWeave provides a built-in way to control the output formatting, allowing you to remove indentation.
%dw 2.0
---
// Sample JSON object
var data = {
"name": "John",
"age": 30,
"city": "New York"
};
// Set the output format to compact (no indentation)
output application/json compact
---
write(data, application/json);
Explanation:
Define the JSON object (data).
Set the output format using the output directive:
application/json: Specifies the content type as JSON.
compact: Instructs DataWeave to produce a compact JSON output without indentation.
The write function writes the data object to the output stream in the specified format (JSON without indentation).
Method 2: Using MEL (Message Expression Language):
While MEL doesn't directly offer formatting options, you can achieve this by leveraging a transformer component. Here's an example:
XML
<transformer ref="JSONTransformer">
<input doc:name="Input Payload" />
<output doc:name="Output Payload">#[payload.toString().replaceAll('\n', '')]</output>
</transformer>
Explanation:
A JSON Transformer component is used to modify the payload.
The input property references the incoming payload.
The output property defines the transformed payload:
#[payload.toString()]: Converts the payload to a string representation.
.replaceAll('\n', ''): Removes all newline characters (\n) from the string, effectively removing indentation.
Choosing the Right Approach:
DataWeave: This is the preferred method as it offers a more declarative and concise approach to control the output formatting directly within your DataWeave script.
MEL: While functional, the MEL approach requires an additional transformer component and might be less readable for complex formatting requirements.
Additional Considerations:
Ensure the payload is a valid JSON object before applying these methods.
Consider using a consistent formatting approach throughout your Mule application for better maintainability.
Here are some helpful resources for further exploration:
DataWeave output directive: https://docs.mulesoft.com/dataweave/latest/dataweave-formats-json
MEL replaceAll function: https://help.mulesoft.com/s/question/0D52T00004xzuprSAA/how-to-replace-a-part-of-a-string-in-mule-3-
Remember that using DataWeave provides a more streamlined and efficient way to manage JSON output formatting within your MuleSoft 4 applications.
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