在 ES6 Node.js 中导入“.json”扩展会引发错误

Question

We're trying to use the new ways of exporting and importing modules for ES6 with Node.js. It's important for us to get the version number from the package.json file. The following code should do that:

import {name, version} from '../../package.json'

However, on execution the following error is thrown:

TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".json" for T:\ICP\package.json imported from T:\ICP\src\controllers\about.js

Is there something we're missing?
Is the extension .json not supported?
Is there another way to retrieve this information using Node.js 13+?

Answer 1

According to the Node.js ES Modules docs . is required for importing JSON files.

Include the flag for the module to work.

node --experimental-json-modules about.js

Answer 2

You can sill import require in an ES6 module for Node.js:

import { createRequire } from "module"; // Bring in the ability to create the 'require' method
const require = createRequire(import.meta.url); // construct the require method
const my_json_file = require("path/to/json/your-json-file.json") // use the require method

Answer 3

You can use it as in docs node-js as follow:

import { readFile } from 'fs/promises';

const json = JSON.parse(await readFile(new URL('../../package.json', import.meta.url)));

Answer 4

From Node.js v16 & v18 official documentation:

import SomeJson from './some.json' assert { type: 'json' }

And run it with the matching experimental flag:

node --experimental-json-modules ./your-file.js

Answer 5

yes, there is another way to fetch version, but it is without ES6 module system. Here's a working example: https://codesandbox.io/s/funny-banzai-2xgvf .

Answer 6

try to use

process.env.npm_package_version

this might help you