为什么这段代码显示找不到模块错误？

Question

inside localbase.js...

const fs = require("fs");

if(!fs.existsSync(__dirname + "/localbase.json")) 
  fs.writeFileSync("./localbase.json", "{}");

let database = require("./localbase.json");

This above code is showing this error Error: Cannot find module './localbase.json' .

The file is imported in server.js as follows.

const lb = require('./db/localbase.js');

my directory structure (apology if my tree looks bad)...

|- db
+--- localbase.js
|- node_modules
|- public
server.js
package.json

But if I put the localbase.js where the server.js is then it's perfectly fine.

Answer 1

so the fix is real simple...

const fs = require("fs");

if(!fs.existsSync(__dirname + "/localbase.json")) 
  fs.writeFileSync(__dirname + "/localbase.json", "{}");

let database = require(__dirname + "/localbase.json");

So basically what I did is I imported relative the root directory(where the node_modules is) which was causing that error.

I thought using require('./localbase.json') would choose the directory relative to server.js but it won't.

So what I learnt is require() uses paths relative to root directory.

Which means I have to use __dirname to import modules inside of sub-directories.