Node.js looping through 2-dimensional jagged array

consider following jagged array structure which is place holder for routing data collected to to organize express routing details

var sample = {
    'get': [
        ['api/spaceships', 'get all'],
        ['api/spaceships/:id', 'get filtered list']
    ],
    'post': [
        ['api/spaceships', 'get all'],
        ['api/spaceships/:id', 'get filtered list']
    ]
}

javascript code below will loop through and print values

Code:
    console.log('-------------------------------------------------');
    for (var j = 0; j < Object.keys(sample).length; j++) {
        console.log('HTTP Method :' + Object.keys(sample)[j]);
        for (var i = 0; i < sample[Object.keys(sample)[j]].length; i++) {
        console.log('-----------Route--------------------');
        console.log('Key:' + sample[Object.keys(sample)[j]][i][0]);
        console.log('Value:' + sample[Object.keys(sample)[j]][i][1]);
        console.log('-----------Route--------------------');
        }
        console.log('-----------Next Iteration---------------------');
    }


Output:

    -------------------------------------------------
    HTTP Method :get
    -----------Route--------------------
    Key:api/spaceships
    Value:get all
    -----------Route--------------------
    -----------Route--------------------
    Key:api/spaceships/:id
    Value:get filtered list
    -----------Route--------------------
    -----------Next Iteration---------------------
    HTTP Method :post
    -----------Route--------------------
    Key:api/spaceships
    Value:get all
    -----------Route--------------------
    -----------Route--------------------
    Key:api/spaceships/:id
    Value:get filtered list
    -----------Route--------------------
    -----------Next Iteration---------------------

Quick Start : MongoDb on Ubuntu 17.04

MongoDb Installation:

Install MongoDb (with super user)
    apt install  mongodb-server

Status of mongodb service
    systemctl status mongodb
    systemctl restart mongodb
        or
    service mongodb start
    service mongodb stop
    service mongodb status

Auto Start service
    systemctl enable mongodb

Version Check
    mongod --version

Configuration File:
    /etc/mongodb.conf

Getting Started with Mongo:

Start Mongo CLI:
  mongo

Insert JSON:
    db.mycollection.insertMany([
    {fname:"john",mname:"joe",lname:"doe",skill:["c#","javascript","sql"]},
    {fname:"mary",mname:"joe",lname:"doe",skill:["ccna","ccnp","cci","operation research"]},
    ])

View Inserted Json:
        db.mycollection.find({}).pretty();
    Output:
        {
            "_id" : ObjectId("5a4634cf26837e3337746881"),
            "fname" : "john",
            "mname" : "joe",
            "lname" : "doe",
            "skill" : [
                "c#",
                "javascript",
                "sql"
            ]
        }
        {
            "_id" : ObjectId("5a4634cf26837e3337746882"),
            "fname" : "mary",
            "mname" : "joe",
            "lname" : "doe",
            "skill" : [
                "ccna",
                "ccnp",
                "cci",
                "operation research"
            ]
        }
Filter Inserted Json on single property:
        db.mycollection.find({"fname":"john"}).pretty();
    Output:
        {
            "_id" : ObjectId("5a4634cf26837e3337746881"),
            "fname" : "john",
            "mname" : "joe",
            "lname" : "doe",
            "skill" : [
                "c#",
                "javascript",
                "sql"
            ]
        }

Filter with contains:
        db.mycollection.find({skill:{$in:["c#","ccna"]}})
    output:
        { "_id" : ObjectId("5a4634cf26837e3337746881"), "fname" : "john", "mname" : "joe", "lname" : "doe", "skill" : [ "c#", "javascript", "sql" ] }
        { "_id" : ObjectId("5a4634cf26837e3337746882"), "fname" : "mary", "mname" : "joe", "lname" : "doe", "skill" : [ "ccna", "ccnp", "cci", "operation research" ] }

Select few Property instead of all:
        db.mycollection.find({skill:{$in:["c#","ccna"]}},{fname:1,mname:1,lname:1})
    output:
        { "_id" : ObjectId("5a4634cf26837e3337746881"), "fname" : "john", "mname" : "joe", "lname" : "doe" }
        { "_id" : ObjectId("5a4634cf26837e3337746882"), "fname" : "mary", "mname" : "joe", "lname" : "doe" }