ReferenceError: module is not defined

Question

So i have been trying to run this web app and at first it showed

(node:12960) Warning: To load an ES module, set "type": "module" in the package.json or use the .mjs extension.
C:\Users\J\react-messenger\stream-chat-boilerplate-api\src\index.js:1
import dotenv from 'dotenv'; ^^^^^^

SyntaxError: Cannot use import statement outside a module

And then i went to put set the type: module in the package.json but it gave me this error

ReferenceError: module is not defined

at file:///C:/Users/J/react-messenger/stream-chat-boilerplate-api/src/index.js:38:1

Here is my code:

import dotenv from 'dotenv';
dotenv.config();

import fs from 'fs';
import path from 'path';
import express from 'express';
import bodyParser from 'body-parser';
import cors from 'cors';
import helmet from 'helmet';
import compression from 'compression';

const api = express();

api.use(cors());
api.use(compression());
api.use(helmet());
api.use(bodyParser.urlencoded({ extended: true }));
api.use(bodyParser.json());

api.listen(process.env.PORT, error => {
    if (error) {
        console.warn(error);
        process.exit(1);
    }

    // eslint-disable-next-line array-callback-return
    fs.readdirSync(path.join(__dirname, 'routes')).map(file => {
        require('./routes/' + file)(api);
    });

    console.info(
        `Running on port ${process.env.PORT} in ${
            process.env.NODE_ENV
        } mode. 🚀`
    );
});

module.exports = api;

I dont know what am doing wrong

As it says: Set "type": "module" in the package.json or use the .mjs extension. — Wolfgang Kuehn
– Wolfgang Kuehn, Commented Oct 2, 2020 at 0:10

Grace Huang · Accepted Answer · 2023-01-25 20:09:44Z

103

You are mixing ES imports with CommonJS - at bottom of file you have module.exports = api; which is CJS terminology. The ES module equivalent is:

export default api

edited Jan 25, 2023 at 20:09

Grace Huang

5,7575 gold badges35 silver badges55 bronze badges

answered Sep 20, 2020 at 3:36

cyberwombat

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3 Comments

Gary Over a year ago

Can I use a require cjs module in .mjs file using an import statement

cyberwombat Over a year ago

@Gary yes you can.

YulePale Over a year ago

This is the straight forward answer I needed!

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