Firebase - REST api calls - postman collection. - Firebase schema - https://www.flickr.com/gp/palaniraja-mca/32J3rA

firebase scheme.json

{
  "activites" : "activitiesTable",
  "tasks" : {
    "-KfbYYnJDdJ1IfQ4D6bl" : {
      "firstname" : "palani",
      "lastname" : "just lastname updated"
    },
    "-KfpLsLVH59MpKXDdYVm" : {
      "firstname" : "palaniraja",
      "lastname" : "raja"
    },
    "-KfpLx-0L-qXUG22w7Z4" : {
      "firstname" : "third"
    }
  }
}

firebase-rest-postman.json

{
	"variables": [],
	"info": {
		"name": "Firebase - Rest sandbox",
		"_postman_id": "d8690460-c790-4b0f-64bf-d16f7ece0225",
		"description": "",
		"schema": "https://schema.getpostman.com/json/collection/v2.0.0/collection.json"
	},
	"item": [
		{
			"name": "Get All objects",
			"request": {
				"url": "https://YOUR-FIREBASE-INSTANCE-ID.firebaseio.com/tasks.json",
				"method": "GET",
				"header": [],
				"body": {},
				"description": ""
			},
			"response": []
		},
		{
			"name": "Insert an object",
			"request": {
				"url": "https://YOUR-FIREBASE-INSTANCE-ID.firebaseio.com/tasks.json",
				"method": "POST",
				"header": [],
				"body": {
					"mode": "raw",
					"raw": "{\n\t\n\t\"firstname\":\"fourth\",\n\t\"lastname\": \"record\"\n\t\n}"
				},
				"description": ""
			},
			"response": []
		},
		{
			"name": "Update  an object",
			"request": {
				"url": "https://YOUR-FIREBASE-INSTANCE-ID.firebaseio.com/tasks/-KfbYYnJDdJ1IfQ4D6bl.json",
				"method": "PATCH",
				"header": [],
				"body": {
					"mode": "raw",
					"raw": "{ \n\"lastname\":\"just lastname updated\"\n}"
				},
				"description": ""
			},
			"response": []
		},
		{
			"name": "delete  an object",
			"request": {
				"url": "https://YOUR-FIREBASE-INSTANCE-ID.firebaseio.com/tasks/-KfpMaGp314IH1AP386k.json",
				"method": "DELETE",
				"header": [],
				"body": {
					"mode": "raw",
					"raw": ""
				},
				"description": ""
			},
			"response": []
		},
		{
			"name": "delete a key from an object",
			"request": {
				"url": "https://YOUR-FIREBASE-INSTANCE-ID.firebaseio.com/tasks/-KfpLx-0L-qXUG22w7Z4/lastname.json",
				"method": "DELETE",
				"header": [],
				"body": {
					"mode": "raw",
					"raw": ""
				},
				"description": ""
			},
			"response": []
		}
	]
}