How to use a global nodejs module? - node.js

Question

I got the following error when I try to use esprima. Does anybody know how to fix the problem? Thanks.
$ npm install -g esprima
/usr/local/bin/esparse -> /usr/local/lib/node_modules/esprima/bin/esparse.js
/usr/local/bin/esvalidate -> /usr/local/lib/node_modules/esprima/bin/esvalidate.js
+ esprima#4.0.1
updated 1 package in 0.837s
$ cat main.js
#!/usr/bin/env node
// vim: set noexpandtab tabstop=2:
var esprima = require('esprima');
var program = 'const answer = 42';
console.log(esprima.tokenize(program));
console.log(esprima.parseScript(program));
$ node main.js
internal/modules/cjs/loader.js:960
throw err;
^
Error: Cannot find module 'esprima'
Require stack:
- /private/tmp/main.js
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:957:15)
at Function.Module._load (internal/modules/cjs/loader.js:840:27)
at Module.require (internal/modules/cjs/loader.js:1019:19)
at require (internal/modules/cjs/helpers.js:77:18)
at Object.<anonymous> (/private/tmp/main.js:4:15)
at Module._compile (internal/modules/cjs/loader.js:1133:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1153:10)
at Module.load (internal/modules/cjs/loader.js:977:32)
at Function.Module._load (internal/modules/cjs/loader.js:877:14)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:74:12) {
code: 'MODULE_NOT_FOUND',
requireStack: [ '/private/tmp/main.js' ]
}

Answer 1

I think you installed esprima module in global node_modules.
If you want to use esprima in main.js which is located at /private/temp/main.js,
you should run npm install esprima in /private/temp/ without -g
EDIT - How to require global modules
Way 1
I assume you're in mac system.
Before you run your main.js, run export NODE_PATH=/usr/local/lib/node_modules in the shell, not node.js program.
Then you could require the global modules by const esprima = require("esprima").
By the way, global modules position could be different in the different system.
Way 2
After you knew your global modules position,
you could require it by const esprima = require("/usr/local/lib/node_modules/esprima")