This demonstrates how you can encrypt data using libsodium-wrappers for the Nedb NoSQL database. The algorithm is xchacha20poly1305

encryption_nedb.ts

import { generateKey, encryptDocument, decryptDocument, ready } from 'easy-doc-crypt'
import Datastore = require('nedb')


(async function() {
  await ready()
  const key = generateKey('MyPassword123')
   function encrypt(serialized :string) {
     console.log('encrypt')
    let d =  encryptDocument(key.secret, serialized)
    let s = JSON.stringify(d)
    console.log('s = ', s)

    return JSON.stringify(d)
  }
   function decrypt(serialized:string ){
     console.log('decrypt')
    let d = JSON.parse(serialized)

    let result =  decryptDocument(key.secret, d.header, d.cipherText)
    console.log('decrypt result = ', result)
    return result
  }

  let db = new Datastore({
    filename: 'mydb',
    autoload: true,
    afterSerialization: encrypt,
    beforeDeserialization: decrypt
  })

  let data = { firstName: 'Homer', lastName: 'Simpson' }
  function getDocument(doc: any) {
    db.findOne({ _id: doc._id }, function(err, doc) {
      if (err) {
        console.log('There was an error fetch doc: ')
      } else {
        console.log('retrieved doc: ', doc)
      }
    })
  }
  db.insert(data, function(err, doc) {
    if (err) {
      console.log('There was an error: ', err)
    } else {
      console.log('Inserted a doc: ', doc)
      getDocument(doc)
    }
  })
})()