'How to send JSON object as JSON String with Postman?

I want to send a JSON request but problem is I need to send my userPropertiesAsJsonString field as JSON string.

How can I send userPropertiesAsJsonString as JSON string?

{
    "User" : {
        "userId" : "11111",
        "userPropertiesAsJsonString" : ?
    }
}

userPropertiesAsJsonString is;

{
    "properties" : {
        "propertyName" : "test",
        "propertyDesc" : "desc"
    }
}

Solution 1:^[1]

Try this :

{
    "User" : {
        "userId" : "11111",
        "userPropertiesAsJsonString" : "{\"properties\" : {\"propertyName\" : \"test\",\"propertyDesc\" : \"desc\"}}"
    }
}

Solution 2:^[2]

Jason Mullings' answer did not work for me, but it was an excellent base that allowed me to come up with a solution to a problem very similar to yours.

In the Pre-request Script tab,

const userPropertiesAsJsonString = {
    "properties" : {
        "propertyName" : "test",
        "propertyDesc" : "desc"
    }
}

pm.environment.set(
    'userPropertiesAsJsonString',
    JSON.stringify(JSON.stringify(userPropertiesAsJsonString))
);

Then, in the Body tab,

{
    "User" : {
        "userId" : "11111",
        "userPropertiesAsJsonString" : {{userPropertiesAsJsonString}}
    }
}

Stringifying the userPropertiesAsJsonString variable twice will allow you to escape the JSON string (solution obtained from this answer; refer to this gist for a more detailed explanation) which will then allow you to obtain a request body that looks like the one in the answer provided by sanatsathyan.

Solution 3:^[3]

pre-request script:

let query = {}

pm.environment.set('query', JSON.stringify(query));

body:

{{query}}

Solution 4:^[4]

As JSON means JavaScript Object Notation, so you can just copy the userPropertiesAsJsonString into the original JSON:

{
    "User" : {
        "userId" : "11111",
        "userPropertiesAsJsonString" : {
            "properties" : {
                "propertyName" : "test",
                "propertyDesc" : "desc"
            }
        }
    }
}

Copy and paste this JSON into the Postman request body (raw formatted) and set the header "Content-Type: application/json".

If you have to do more fancy stuff before the request you can execute a pre-request script in Postman: https://www.getpostman.com/docs/postman/scripts/pre_request_scripts

For more about JSON see here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON

Solution 5:^[5]

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	sanatsathyan
Solution 2	sabriele
Solution 3	Jason Mullings
Solution 4
Solution 5	alexaner

'How to send JSON object as JSON String with Postman?

Solution 1:[1]

Solution 2:[2]

Solution 3:[3]

Solution 4:[4]

Solution 5:[5]