How can I npm link the module in React project?

I working on a React project and I want to modify one of the module. Below is my step.

File tree:
  /project
    package.json
    /project_need_module (the sub module)

1. cd /project/project_need_module
2. npm link
3. cd /project
4. npm link project_need_module

But there is a compile error saying module not found. do I have to add a line like

"project_need_module": "file:/project/project_need_module"

in package.json with npm install? Cheers