MongoError: failed to connect to server [localhost:27017] on first connect

Question

I have paid membership and downloaded this project. After npm install and node app.js, it returns the following error:

Does anyone know what's wrong?

/Users/Thomas/Desktop/mean-stack-tutorial-01$ node app.js 

/Users/Thomas/Desktop/mean-stack-tutorial-01/node_modules/mongodb/lib/server.js:265

        process.nextTick(function() { throw err; })

                                      ^

MongoError: failed to connect to server [localhost:27017] on first connect

    at Pool.<anonymous> (/Users/Thomas/Desktop/mean-stack-tutorial-01/node_modules/mongodb-core/lib/topologies/server.js:325:35)

    at emitOne (events.js:96:13)

    at Pool.emit (events.js:188:7)

    at Connection.<anonymous> (/Users/Thomas/Desktop/mean-stack-tutorial-01/node_modules/mongodb-core/lib/connection/pool.js:270:12)

    at Connection.g (events.js:292:16)

    at emitTwo (events.js:106:13)

    at Connection.emit (events.js:191:7)

    at Socket.<anonymous> (/Users/Thomas/Desktop/mean-stack-tutorial-01/node_modules/mongodb-core/lib/connection/connection.js:173:49)

    at Socket.g (events.js:292:16)

    at emitOne (events.js:96:13)

    at Socket.emit (events.js:188:7)

    at emitErrorNT (net.js:1281:8)

    at _combinedTickCallback (internal/process/next_tick.js:74:11)

    at process._tickCallback (internal/process/next_tick.js:98:9)

Edit 1: Following the comments, I just installed mongo via brew, and did brew services start mongodb and then mongo:

/Users/Thomas$ mongo MongoDB shell version v3.4.1 connecting to: mongodb://127.0.0.1:27017 MongoDB server version: 3.4.1 Server has startup warnings: 2017-01-12T19:53:01.868+0800 I CONTROL [initandlisten] 2017-01-12T19:53:01.869+0800 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database. 2017-01-12T19:53:01.869+0800 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted. 2017-01-12T19:53:01.869+0800 I CONTROL [initandlisten]

Then I did

/Users/Thomas$ mongod -httpinterface --dbpath /Users/Thomas/Desktop/MongoDB/db 2017-01-12T20:14:05.620+0800 I CONTROL [initandlisten] MongoDB starting : pid=47356 port=27017 dbpath=/Users/Thomas/Desktop/MongoDB/db 64-bit host=Pro.local 2017-01-12T20:14:05.621+0800 I CONTROL [initandlisten] db version v3.4.1 2017-01-12T20:14:05.621+0800 I CONTROL [initandlisten] git version: 5e103c4f5583e2566a45d740225dc250baacfbd7 2017-01-12T20:14:05.621+0800 I CONTROL [initandlisten] OpenSSL version: OpenSSL 1.0.2j 26 Sep 2016 2017-01-12T20:14:05.621+0800 I CONTROL [initandlisten] allocator: system 2017-01-12T20:14:05.621+0800 I CONTROL [initandlisten] modules: none 2017-01-12T20:14:05.621+0800 I CONTROL [initandlisten] build environment: 2017-01-12T20:14:05.621+0800 I CONTROL [initandlisten] distarch: x86_64 2017-01-12T20:14:05.621+0800 I CONTROL [initandlisten] target_arch: x86_64 2017-01-12T20:14:05.621+0800 I CONTROL [initandlisten] options: { storage: { dbPath: "/Users/Thomas/Desktop/MongoDB/db" } } 2017-01-12T20:14:05.657+0800 I STORAGE [initandlisten] wiredtiger_open config: create,cache_size=3584M,session_max=20000,eviction=(threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),checkpoint=(wait=60,log_size=2GB),statistics_log=(wait=0), 2017-01-12T20:14:14.108+0800 I CONTROL [initandlisten] 2017-01-12T20:14:14.108+0800 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database. 2017-01-12T20:14:14.108+0800 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted. 2017-01-12T20:14:14.108+0800 I CONTROL [initandlisten] 2017-01-12T20:14:14.108+0800 I CONTROL [initandlisten] 2017-01-12T20:14:14.109+0800 I CONTROL [initandlisten] ** WARNING: soft rlimits too low. Number of files is 256, should be at least 1000 2017-01-12T20:14:15.390+0800 I FTDC [initandlisten] Initializing full-time diagnostic data capture with directory '/Users/Thomas/Desktop/MongoDB/db/diagnostic.data' 2017-01-12T20:14:16.303+0800 I INDEX [initandlisten] build index on: admin.system.version properties: { v: 2, key: { version: 1 }, name: "incompatible_with_version_32", ns: "admin.system.version" } 2017-01-12T20:14:16.304+0800 I INDEX [initandlisten] building index using bulk method; build may temporarily use up to 500 megabytes of RAM 2017-01-12T20:14:16.406+0800 I INDEX [initandlisten] build index done. scanned 0 total records. 0 secs 2017-01-12T20:14:16.407+0800 I COMMAND [initandlisten] setting featureCompatibilityVersion to 3.4 2017-01-12T20:14:16.407+0800 I NETWORK [thread1] waiting for connections on port 27017

Then in another terminal, I did node app.js, which hangs (and does not print anything). Then I does http://localhost:28017 in a browser, it seems to work:

However, how could I see the website?

Edit 2:

The normal process is

1. install mongo

2. brew services start mongodb in a terminal

3. mongo & (assume we use the default folder /data/db/)

4. npm start

5. see e.g., bin/www for the port number, then use localhost:the_port_number in a browser

Answer 1

The main thing is that you haven't started your mongo database. First, you need to install mongo as per your OS https://docs.mongodb.com/v3.0/tutorial/ then follow instructions mentioned on this site: https://docs.mongodb.com/v3.0/tutorial/getting-started-with-the-mongo-shell/

cd mongod --dbpath 

and then start your node server.

Hope this helps!