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How to use boolean() prefix in JSON

What is boolean() prefix​

The boolean() prefix is an advanced built-in function that is used to convert a value mapped inside it into a boolean format. This prefix is commonly used in request JSON when a
  • Static dropdown values need to be converted into the boolean format e.g. true or false.


  • Need to remove key from JSON if don't want to pass boolean value.

For instance, consider the following example:
    "name": "{{name}}",
    "email": "{{email}}",
    "additional_info": {
        "is_married": "boolean({{is_married}})",
        "age": "numeric({{age}})"

In this JSON, the is_married is enclosed in the boolean() prefix to convert them to boolean format:
  "name": "mahesh",
  "email": "[email protected]",
  "additional_info": {
    "is_married": true,
    "age": null

Using the numeric() prefix can ensure that certain values are always returned in boolean format.

How to Use numeric() prefix:

In the given example API endpoint requires the value of is_married in boolean format. So I'll map is_married inside numeric() prefix like this -

In the workflow page when the user will select is_married value -


I'll get is_married in the boolean format like this -


  • Avoid using {{##boolean:true##}} or {{##boolean:false##}} when using Pabbly custom fields. Instead, use 'true' or 'false' in a static dropdown


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