Single Collection

{
    "collection": {
        "info": {
            "_postman_id": "f2e66c2e-5297-e4a5-739e-20cbb90900e3",
            "description": "This is a sample collection that makes a tiny request to Postman Echo service to get the list of request headers sent by a HTTP client.",
            "name": "Sample Collection",
            "schema": "https://schema.getpostman.com/json/collection/v2.0.0/collection.json"
        },
        "item": [
            {
                "event": [
                    {
                        "listen": "test",
                        "script": {
                            "exec": "var responseJSON;\ntry {\n    tests[\"Body contains headers\"] = responseBody.has(\"headers\");\n    responseJSON = JSON.parse(responseBody);\n    tests[\"Header contains host\"] = \"host\" in responseJSON.headers;\n    tests[\"Header contains test parameter sent as part of request header\"] = \"my-sample-header\" in responseJSON.headers;\n}\ncatch (e) { }\n\n\n\n",
                            "type": "text/javascript"
                        }
                    }
                ],
                "id": "82ee981b-e19f-962a-401e-ea34ebfb4848",
                "name": "Request Headers",
                "request": {
                    "body": {
                        "formdata": [],
                        "mode": "formdata"
                    },
                    "description": "",
                    "header": [
                        {
                            "description": "",
                            "key": "my-sample-header",
                            "value": "Lorem ipsum dolor sit amet"
                        }
                    ],
                    "method": "GET",
                    "url": "https://echo.getpostman.com/headers"
                },
                "response": []
            }
        ],
        "variables": []
    }
}