Jmeter JSON Path Assertion

Question

Below is my JSON response data, I need to do assertion using the below response. I tried in many ways to write JSON path & Expected Value. Always assertion fails. What I want is please help to write the path and expected value for the below data

{
    "statusCode": 200,
    "statusMessage": "Success",
    "errorMessage": "",
    "responseData": {
        "id": 15,
        "userName": "[email protected]",
        "firstName": "tarento",
        "lastName": "test1",
        "phoneNumber": "1234567812",
        "email": "[email protected]",
        "password": "",
        "city": "",
        "agentList": [
            {
                "id": 37,
                "userName": "[email protected]",
                "firstName": "Sanjay",
                "lastName": "rahul",
                "phoneNumber": "7411269480",
                "email": "[email protected]",
                "password": "",
                "active": true
            },
            {
                "id": 68,
                "userName": "[email protected]",
                "firstName": "jinesh",
                "lastName": "sumedhan",
                "phoneNumber": "9400993826",
                "email": "[email protected]",
                "password": "",
                "active": true
            },
            {
                "id": 108,
                "userName": "[email protected]",
                "firstName": "Rahul",
                "lastName": "Antony",
                "phoneNumber": "9994590241",
                "email": "[email protected]",
                "password": "",
                "active": true
            },
            {
                "id": 304,
                "userName": "[email protected]",
                "firstName": "Agent",
                "lastName": "Agent",
                "phoneNumber": "9025699716",
                "email": "[email protected]",
                "password": "",
                "active": true
            }
        ],
        "roleName": "admin",
        "sessionKey": "435tnerLt9813942160478oDse46345635#1",
        "partner": {
            "id": 1,
            "name": "Tarento",
            "cityList": [
                "bangalore",
                "mumbai"
            ],
            "phone": "1234567812",
            "url": ""
        },
        "isActive": true,
        "isDeleted": false,
        "roleId": 1,
        "countryCode": "",
        "tags": [
            {
                "tagId": 1,
                "name": "all",
                "description": "this is default tag of all driver."
            },
            {
                "tagId": 2,
                "name": "airport",
                "description": ""
            },
            {
                "tagId": 3,
                "name": "street",
                "description": "any text message"
            },
            {
                "tagId": 255,
                "name": "night",
                "description": "night"
            }
        ]
    }
}

I received the following response

Answer 1

For start following JSONPath Assertion will test your statusCode

$.statusCode

put 200 to Expected Value of JSONPath Assertion.

This one is for userName

$.responseData.userName

Easy, isn't it? See Parsing JSON guide for more useful examples and how-tos.