Monday, May 20, 2024
Homepage · node.js
 Popular · Latest · Hot · Upcoming
-1
rated 0 times [  3] [ 4]  / answers: 1 / hits: 7286  / 3 Years ago, sat, march 20, 2021, 12:00:00

I want to import package.json into test.js, both files are in same directory.


I tried with require :


const jsonfile = require("./packages.json");



console.log({ jsonfile });

it throws error:


file:///home/.../test.js:1

const jsonfile = require("./packages.json");

                 ^

ReferenceError: require is not defined

    at file:///home/.../test.js:1:18

    at ModuleJob.run (internal/modules/esm/module_job.js:145:37)

    at async Loader.import (internal/modules/esm/loader.js:182:24)

    at async Object.loadESM (internal/process/esm_loader.js:68:5)

This error implies, like it runs in browser, where is no require, I found an answer with similar message.


I tried with import:


import * as jsonfile from './packages.json';



console.log({ jsonfile });



internal/process/esm_loader.js:74

    internalBinding('errors').triggerUncaughtException(

                              ^



Error [ERR_MODULE_NOT_FOUND]: Cannot find module '/home/.../packages.json' imported from /home/.../test.js

    at finalizeResolution (internal/modules/esm/resolve.js:271:11)

    at moduleResolve (internal/modules/esm/resolve.js:694:10)

    at Loader.defaultResolve [as _resolve] (internal/modules/esm/resolve.js:784:11)

    at Loader.resolve (internal/modules/esm/loader.js:100:40)

    at Loader.getModuleJob (internal/modules/esm/loader.js:246:28)

    at ModuleWrap.<anonymous> (internal/modules/esm/module_job.js:47:40)

    at link (internal/modules/esm/module_job.js:46:36) {

  code: 'ERR_MODULE_NOT_FOUND'

}

What I have tried more?



  • Single quotes and double quote around filename

  • filename with extension and without.

  • with flag --experimental-json-modules

  • adding "type":"module into package.json (but this is for Node >= 13, but without it I got warning (node:7170) Warning: To load an ES module, set "type": "module" in the package.json or use the .mjs extension. and then also error SyntaxError: Cannot use import statement outside a module)


I found even suggestions to load JSON-file as regular text files and parse them into data structure, but this seems like the last resort...


It seems such a trivial task, but I have not found the idiomatic way how to import JSON-data into Javascript variable. What is wrong here? How should I import it?


I use Node 12.21.0


More From » node.js
 Answers
4

You're using Node.js in ESM mode, ESM does not currently import JSON modules by default. You can either:



  1. Turn on JSON module importing (by passing a CLI flag)
    OR

  2. Create a require function in your ESM code and use that OR

  3. JSON.parse the file manually


Turn on JSON module importing (by passing a CLI flag)


You can do that by passing the --experimental-json-modules flag.


node --experimental-json-modules yourfile.js # can import JSON here

Create a require function in your ESM code


You can also always fall back on CommonJS modules and create a require of your own:


import { createRequire } from 'module';

const require = createRequire(import.meta.url);

require('./package.json'); // now works

JSON.parse the file manually


You can always just read JSON files with regular filesystem methods:


# const fs = require('fs');

import * as fs from 'fs';

const result = JSON.parse(fs.readFileSync('./package.json'));

[#1619] Monday, March 15, 2021, 3 Years  [reply] [flag answer]
Only authorized users can answer the question. Please sign in first, or register a free account.
turnerf
Add To Favorites
Follow
Total Points: 620
Total Questions: 101
Total Answers: 109
Location: French Polynesia
Member since Tue, Jul 7, 2020
4 Years ago
turnerf questions
Thu, Oct 7, 21, 00:00, 3 Years ago
Tue, Jul 28, 20, 00:00, 4 Years ago
Fri, Apr 10, 20, 00:00, 4 Years ago
Sat, Apr 4, 20, 00:00, 4 Years ago
Tue, Mar 26, 19, 00:00, 5 Years ago
View All
;