__dirname 在 Node 14版本中没有定义

How are you loading the file? According to this issue, the problem arises if you load it as an ECMAScript module which do not contain __dirname.

https://github.com/nodejs/help/issues/2907#issuecomment-671782092

Following the documentation below you may be able to resolve the issue: https://nodejs.org/api/esm.html#esm_no_require_exports_module_exports_filename_dirname

import { fileURLToPath } from 'url';
import { dirname } from 'path';


const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

There's usually no need to import from 'url' or 'path'.

E.g. (using ESM)

fs.readFileSync(new URL('myfile.txt', import.meta.url));

will read myfile.txt from the directory of the JavaScript file (not from the current working directory).

My code before was like below.

app.use(express.static(path.join(__dirname, 'public')));

And I got this error.

ReferenceError: __dirname is not defined in ES module scope

And I solved this by adding code below.

import path from 'path';
const __dirname = path.resolve();

A quick fix (depending on your project) would be to ensure that "type": "module" does not exist in your package.json file

Got this from above link

import express from 'express';
import path from 'path';
import { fileURLToPath } from 'url';


const app = express();


//we need to change up how __dirname is used for ES6 purposes
const __dirname = path.dirname(fileURLToPath(import.meta.url));
//now please load my static html and css files for my express app, from my /dist directory
app.use(express.static(path.join(__dirname ,'dist')));


//works...