express - Mongoose error when running node -

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when run node server.js in terminal, receive following error mongoose:

/users/xxxx/desktop/projects/crud/node_modules/mongoose/node_modules/mongodb/lib/server.js:235         process.nexttick(function() { throw err; })                                       ^ error: connect econnrefused 127.0.0.1:27017     @ object.exports._errnoexception (util.js:860:11)     @ exports._exceptionwithhostport (util.js:883:20)     @ tcpconnectwrap.afterconnect [as oncomplete] (net.js:1063:14)

i've ran npm install mongoose warning, doubt that's reason mongodb database isn't running. here warning: 

> kerberos@0.0.17 install /users/sean/desktop/projects/crud/node_modules/kerberos > (node-gyp rebuild) || (exit 0)    cxx(target) release/obj.target/kerberos/lib/kerberos.o   cxx(target) release/obj.target/kerberos/lib/worker.o   cc(target) release/obj.target/kerberos/lib/kerberosgss.o ../lib/kerberosgss.c:509:13: warning: implicit declaration of function 'gss_acquire_cred_impersonate_name' invalid in c99       [-wimplicit-function-declaration]         maj_stat = gss_acquire_cred_impersonate_name(&min_stat,                    ^ 1 warning generated.   cc(target) release/obj.target/kerberos/lib/base64.o   cxx(target) release/obj.target/kerberos/lib/kerberos_context.o   solink_module(target) release/kerberos.node

it can happen when mongodb service not running on machine.so start below command open node server no interrupt mongodb run on default port.

brew services start mongodb


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