Questions
Q:

ReferenceError: mongoose is not defined

how to fix this ReferenceError problem,

ReferenceError: mongoose is not defined
    at Object. (C:\Users\Erik\3D Objects\siam\siam_voice\server.js:1:1)      
    at Module._compile (internal/modules/cjs/loader.js:1072:14)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1101:10)
    at Module.load (internal/modules/cjs/loader.js:937:32)
    at Function.Module._load (internal/modules/cjs/loader.js:778:12)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:76:12)       
    at internal/main/run_main_module.js:17:47