Simple E2EE for web apps

Usage no npm install needed!

<script type="module">
  import 47ngSimpleE2ee from 'https://cdn.skypack.dev/@47ng/simple-e2ee';



NPM MIT License Continuous Integration Coverage Status Dependabot Status

Simple end-to-end encryption for web apps. Inspired from Excalidraw and Firefox Send (RIP).

How it works

You encrypt your data in the browser, send the encrypted data to a server, and use the hash part of the URL (which never hits the server) to share the key with someone else.

On the other side, the recipient obtains the key from the URL, the payload from the server and decrypts the data.

This library does not handle any of the server upload/download side, it's up to you. It only deals with encryption, decryption and moving keys in and out of URLs.


$ yarn add @47ng/simple-e2ee
# or
$ npm i @47ng/simple-e2ee


import {
} from '@47ng/simple-e2ee'

// Before sending data to the server, encrypt it:
const { payload, key } = encrypt(
  "whatever you want, as long as it's JSON-serialisable"

// Upload `payload` to the server
// Stick the key onto the current URL:
const shareURL = applyKeyToURL(key)

// Optionally, apply the key to another URL
// (example, with an ID returned from the server):
const shareURL = applyKeyToURL(key, `https://example.com/share/${id}`)

// On the other side, get the key from the current URL,
// and the payload from the server:
const key = getKeyFromURL()
const message = decrypt(payload, key)

// Optionally, obtain the key from any URL:
const key = getKeyFromURL(

// Encrypt related pieces of content with the same key:
const payload = encrypt('some more data', key)

// Generate a key for later use:
const key = generateKey()


MIT - Made with ❤️ by François Best.

Using this package at work ? Sponsor me to help with support and maintenance.