App Integration Guide (Developers)

How to use boolean() prefix in JSON

Pabbly Connect Team•Updated Aug 17, 2026•1 min read

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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:

JSON:

{
    "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:

JSON:

{
  "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 -

Note:-

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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What is boolean() prefix​

What is boolean() prefix