How to Build NextJS Project on Local without Now

After so many struggle, I found answer of my question I have to add following line in my package.json under scripts:

"scripts": {
    ......
    "export": "npm run build && next export"
    .....
},

Basically I my case, npm run build && next export was complete required command to build NextJS project. So after adding this into package.json you just need to run in terminal: npm export and it will generate complete build for nextjs project.