Simple MongoDB REST API

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mongodb_rest_api.js

var express = require('express');
var app = express();
var bodyParser = require('body-parser');
var helmet = require('helmet');
app.use(helmet());
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
//http://mongodb.github.io/node-mongodb-native/3.1/quick-start/quick-start/
const MongoClient = require('mongodb').MongoClient;
var db=null;
const client = new MongoClient('mongodb://localhost:27017',{ useNewUrlParser: true });
client.connect(function(err) {
    if(err) return console.log(err);
    console.log("Connected successfully to server");
    db = client.db('mongoadmin');
});
var outputFn=(res)=>{
    return (err,result)=>{
        if(err) res.status(500).send(err);
        else res.json(result);
    };
}

app.get('/',(req,res)=>{
    res.json({message:"Welcome to mongoadmin API"});
})
app.post('/insert/:name',(req,res)=>{
    var col=db.collection(req.params.name);
    if(Array.isArray(req.body))
        col.insertMany(req.body,outputFn(res));
    else
        col.insertOne(req.body,outputFn(res))
})
app.get('/find/:name',(req,res)=>{
    db.collection(req.params.name).find({}).toArray(outputFn(res))
})
app.post('/find/:name',(req,res)=>{
    db.collection(req.params.name).find(req.body).toArray(outputFn(res))
})
app.post('/update/:name',(req,res)=>{
    db.collection(req.params.name).update(req.body.select,req.body.set).toArray(outputFn(res))
})
app.get('/delete/:name',(req,res)=>{
    db.collection(req.params.name).deleteMany({},outputFn(res))
})
app.post('/delete/:name',(req,res)=>{
    var col=db.collection(req.params.name);
    if(req.query.many)
        col.deleteMany(req.body,outputFn(res))
    else
        col.deleteOne(req.body,outputFn(res))
})
app.get('/indexes/:name',(req,res)=>{
    db.collection(req.params.name).indexes(outputFn(res))
})
app.get('/deleteindexes/:name',(req,res)=>{
    db.collection(req.params.name).dropIndexes(outputFn(res))
})
app.post('/indexes/:name',(req,res)=>{
    if(Array.isArray(req.body))
        db.collection(req.params.name).createIndexes(req.body,outputFn(res));
    else
        db.collection(req.params.name).createIndex(req.body,outputFn(res));
})
app.get('/count/:name',(req,res)=>{
    db.collection(req.params.name).countDocuments({},outputFn(res));
})
app.post('/count/:name',(req,res)=>{
    db.collection(req.params.name).countDocuments(req.body,outputFn(res));
})
app.get('/collections',(req,res)=>{
    db.listCollections({}).toArray(outputFn(res));
})
app.options("/*", function(req, res, next){
    res.header('Access-Control-Allow-Origin', '*');
    res.header('Access-Control-Allow-Methods', 'GET,POST,OPTIONS');
    res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization, Content-Length, X-Requested-With');
    res.json([
	{method:"options",path:"/"},
	{method:"post",path:'/insert/:name'},
	{method:"get",path:'/find/:name'},
	{method:"post",path:'/find/:name'},
	{method:"post",path:'/update/:name'},
	{method:"get",path:'/delete/:name'},
	{method:"post",path:'/delete/:name'},
	{method:"get",path:'/indexes/:name'},
	{method:"get",path:'/deleteindexes/:name'},
	{method:"post",path:'/indexes/:name'},
	{method:"get",path:'/count/:name'},
	{method:"post",path:'/count/:name'},
	{method:"get",path:'/collections'},
    ]);
})
app.all('*',(req,res)=>{
    res.status(404).end();
})
var port=3000;
app.listen(port,()=>{
    console.log("Listening on 'http://127.0.0.1:"+port);
});

package.json

{
  "name": "mongodb_admin_api",
  "version": "0.0.1",
  "description": "Simple mongodb rest api",
  "main": "index.js",
  "scripts": {
    "start": "nodemon index"
  },
  "keywords": [],
  "author": "Koushik Seal",
  "license": "MIT",
  "dependencies": {
    "body-parser": "^1.15.2",
    "express": "^4.14.0",
    "helmet": "^3.6.0",
    "mongodb": "^3.1.8"
  }
}