Add id (nanoid) YAML property to all .md files

index.js

import { nanoid } from 'nanoid';
import {globby} from 'globby';
import matter from 'gray-matter';
import { writeFile } from 'fs';

const NOTES_DIR = "../notes_temp"

const paths = await globby(NOTES_DIR, {
    expandDirectories: {
        extensions: ['md']
    }
});

for (let path of paths) {
    console.log(`\nProcessing: ${path}`);
    const file = matter.read(path);

    const metadata = file.data;

    if (!metadata.hasOwnProperty('id')) {

        // Use Raw Metadata so the order of the YAML properties remains the same
        const raw_meta = file.matter.split('\n');

        // The first entry is always an empty string. Replacing that with the ID
        raw_meta[0] = `id: ${nanoid()}`

        // Data to write to the file
        const data = ['---', raw_meta.join('\n'), '---', file.content]

        writeFile(path, data.join('\n'), function (err) {
            if (err) return console.log(err);
            console.log(`Updated: ${path}`);
        });
    }
}

package.json

{
  "name": "notes_nanoid_generator",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "type": "module",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "globby": "^13.1.2",
    "gray-matter": "^4.0.3",
    "nanoid": "^4.0.0"
  }
}