Failed to connect to server on first connect - node.js

Question

I am getting this error in my code
mongodb-c | Error parsing command line: unrecognised option '--smallfiles'
mongodb-c | try 'mongod --help' for more information
mongodb-c exited with code 2
api_1 |
api_1 | > agte-api#1.0.0 start /app
api_1 | > nodemon index.js --watch
api_1 |
api_1 | [nodemon] 1.19.4
api_1 | [nodemon] to restart at any time, enter `rs`
api_1 | [nodemon] watching dir(s): *.*
api_1 | [nodemon] watching extensions: js,mjs,json
api_1 | [nodemon] starting `node index.js`
api_1 | (node:30) DeprecationWarning: `open()` is deprecated in mongoose >= 4.11.0, use `openUri()` instead, or set the `useMongoClient` option if using `connect()` or `createConnection()`. See http://mongoosejs.com/docs/4.x/docs/connections.html#use-mongo-client
api_1 | Server is running on http://localhost:3000 or http://127.0.0.1:3000
api_1 | Mongoose connection error: MongoError: failed to connect to server [db:27017] on first connect [Error: getaddrinfo ENOTFOUND db
api_1 | at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:64:26) {
api_1 | name: 'MongoError',
api_1 | message: 'getaddrinfo ENOTFOUND db'
api_1 | }]
api_1 | [nodemon] app crashed - waiting for file changes before starting...
Code:
version: '2'
services:
db:
image: mongo
container_name: 'mongodb-c'
ports:
- "27017:27017"
command:
- --smallfiles
# environment:
# - MONGO_INITDB_ROOT_USERNAME=superuser
# - MONGO_INITDB_ROOT_PASSWORD=admin
# - MONGO_INITDB_DATEBASE=admin
volumes:
- db:/data/db
api:
build: .
command: npm start
ports:
- 3000:3000
- 5858:5858
volumes:
- '/api'
depends_on:
- db
links:
- db
environment:
PORT: 3000
volumes:
db: