Angular.js, node.js: require or import ? neither work for me :(

I am very new to Angular.js and node.js and I am facing a problem since this morning that has been partially solved. How to update a json file with data entered by a user via a form.

Thanks to some help that I got here, I managed to do that using lowdbwhich looks like an awesome dependency. The thing is, I can only make it work from a test file, like so:

1/ test.js (that I run node test.js)

const FileSync = require('lowdb/adapters/FileSync')

const dbFileName = "database/lexicon.json";
const adapter = new FileSync(dbFileName)
const db = low(adapter)

// Add another entry
db.get('entries')
.push({
    "title": "Here's a new entry",
    "topics": ["ajax", "rails"],
    "content": "This is very complicated",
    "link": "",
    "mainCategory": "Node.js"
    })
.write();

2/ Controller from where I would like it to work:

function EntryController ($http) {
    const ctrl = this;
    const API = '../database/lexicon.json';

    this.entry = {
    title: "",
    topics: [],
    content: "",
    link: "",
    mainCategory: ""
    };
    this.submitEntry = function () {
        
        const low = require('lowdb')
        const FileSync = require('lowdb/adapters/FileSync')
        
        const dbFileName = "database/lexicon.json";
        const adapter = new FileSync(dbFileName)
        const db = low(adapter)
        
        // Add another entry
        db.get('entries')
        .push({
            "title": "Number 1",
            "topics": ["ajax", "rails"],
            "content": "This is very complicated",
            "link": "",
            "mainCategory": "Node.js"
            })
        .write();
    };
};


angular
    .module('app')
    .controller('EntryController', EntryController);

But when running the app and submitting the form I get this error message require is not defined

I tried something similar with import but I get a similar error message: Cannot use import statement outside a module

Can anybody help?

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Author: Olivier Girardot