How can I solve this mongo report?

  mongodb, question
 throw er;  // Unhandled 'error' event
 MongoError: failed to connect to server [localhost:27017] on first connect [MongoError: connect ECONNREFUSED]
 at Pool.<anonymous> (D:\projects\myblog\node_modules\mongodb-core\lib\topologies\server.js:328:35)
 at emitOne (events.js:96:13)
 at Pool.emit (events.js:191:7)
 at Connection.<anonymous> (D:\projects\myblog\node_modules\mongodb-core\lib\connection\pool.js:274:12)
 at Object.onceWrapper (events.js:293:19)
 at emitTwo (events.js:106:13)
 at Connection.emit (events.js:194:7)
 at Socket.<anonymous> (D:\projects\myblog\node_modules\mongodb-core\lib\connection\connection.js:177:49)

I think you have found the reason.

Because MongoDB did not start. Start MongoDB on Windows OS!

For reference.

Love MongoDB! Have fun!