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SaltyRTC JavaScript Client

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This is a SaltyRTC v1 implementation for JavaScript (ES5+) written in TypeScript 2.

Warning: This is beta software. Use at your own risk. Testing and review is welcome!

The library has been tested with Firefox 45+ and Chromium 49+.


Via npm

You can install this library via npm:

npm install --save @saltyrtc/client msgpack-lite tweetnacl


Alternatively, copy one of the following files to your project directly:

  • ES2015: dist/saltyrtc-client.es2015.js
  • ES5: dist/saltyrtc-client.es5.js
  • ES5 minified: dist/saltyrtc-client.es5.min.js
  • ES5 minified polyfilled: dist/saltyrtc-client.es5.min.polyfill.js

Make sure to manually add the following external dependencies to your project:


See Docs.


Install dependencies:

$ npm install

To compile the TypeScript sources to a single JavaScript (ES5 / Minified ES5 / ES2015) file:

$ npm run dist

The resulting files will be located in dist/.

Due to a bug (, rollup does not currently output non-fatal errors from TypeScript. To see those, simply issue npm run validate in your main directory.

$ npm run validate


1. Preparing the Server

First, clone the saltyrtc-server-python repository.

git clone
cd saltyrtc-server-python

Then create a test certificate for localhost, valid for 5 years.

openssl req \
   -newkey rsa:1024 \
   -x509 \
   -nodes \
   -keyout saltyrtc.key \
   -new \
   -out saltyrtc.crt \
   -subj /CN=localhost \
   -reqexts SAN \
   -extensions SAN \
   -config <(cat /etc/ssl/openssl.cnf \
     <(printf '[SAN]\nsubjectAltName=DNS:localhost')) \
   -sha256 \
   -days 1825

You can import this file into your browser certificate store. For Chrome/Chromium, use this command:

certutil -d sql:$HOME/.pki/nssdb -A -t "P,," -n saltyrtc-test-ca -i saltyrtc.crt

In Firefox the easiest way to add your certificate to the browser is to start the SaltyRTC server (e.g. on localhost port 8765), then to visit the corresponding URL via https (e.g. https://localhost:8765). Then, in the certificate warning dialog that pops up, choose "Advanced" and add a permanent exception.

Create a Python virtualenv with dependencies:

python3 -m virtualenv venv
venv/bin/pip install .[logging]

Finally, start the server with the following test permanent key:

export SALTYRTC_SERVER_PERMANENT_KEY=0919b266ce1855419e4066fc076b39855e728768e3afa773105edd2e37037c20 # Public: 09a59a5fa6b45cb07638a3a6e347ce563a948b756fd22f9527465f7c79c2a864
venv/bin/saltyrtc-server -v 5 serve -p 8765 \
    -sc saltyrtc.crt -sk saltyrtc.key \

2. Running Tests

To compile the test sources, run:

$ npm run rollup_tests

Then simply open tests/testsuite.html in your browser!

Alternatively, run the tests automatically in Firefox and Chrome:

$ npm test

3. Linting

To run linting checks:

npm run lint

You can also install a pre-push hook to do the linting:

echo -e '#!/bin/sh\nnpm run lint' > .git/hooks/pre-push
chmod +x .git/hooks/pre-push


Responsible Disclosure / Reporting Security Issues

Please report security issues directly to one or both of the following contacts:

Coding Guidelines

  • Write clean ES2015
  • Favor const over let


MIT, see