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": []
  }
}