Chat application developed with Kemal, React, ES2015 and PostgreSQL kemal javascript react chat-application
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React + ES2015 + Kemal + PostgreSQL Chat Example


Chat app using React + ES2015 + Kemal + PostgreSQL

This demonstrates how easy it is to build Realtime Web applications with Kemal.

* This project is a fork of, but implements ES2015 and integrates with a persistent data storage with PostgreSQL*


  • Crystal 0.18.7
  • PostgreSQL (I have the v9.5.2)
  • Node (I have the v5.11.1)
  • NPM (I have the v3.8.6)

**Node and NPM are both optional if you are just going to run the app, but necessary for development since they are needed to run the gulp tasks*


Before you can run this program you have to install the packages that it uses. You do that with $ shards install. You also need to change the path to the PostgreSQL database in src/db/ and src/

# src/db/
require "pg"

# Configure these two variables
DB_NAME = "db_name"
PG_PATH = "postgres://user:password@localhost:5432"

# src/
require "kemal"
require "pg"
require "./app/message"

# Configure the path of the database based on what you did in the src/db/ file
conn = PG.connect "postgres://user:password@localhost:5432/db_name


Once you have installed the dependencies and configured the database path, you need to create the actual database and table for the application. You do that by running $ crystal src/db/

Run Project

You can run this program in two ways:

  1. Compile/build the project using the command line with $ crystal build src/ --release and run the executable $ ./app
  2. Run the program with $ crystal src/ (no compilation required)

Once you have run the program, you can open a browser window at localthost:3000 and see the actual app.

Live Demo

You can see and use a live demo of the app here:

  github: Angarsk8/chat-app-demo
License MIT
Crystal none


Dependencies 2

  • kemal
    {'github' => 'sdogruyol/kemal'}
  • pg
    {'github' => 'will/crystal-pg'}

Development Dependencies 0

Dependents 0

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