Ruby API + UI (Sinatra)

Small Ruby app with:

• /: a simple UI that lists all APIs available in the app
• 3 JSON APIs:
  • GET /api/ping
  • GET /api/time
  • POST /api/echo

Run locally

Requirements: Ruby 3.3+

bundle install
bundle exec ruby app.rb

Then open:

• UI: http://localhost:9000/

APIs

GET /api/ping

curl -s http://localhost:9000/api/ping

GET /api/time

curl -s http://localhost:9000/api/time

POST /api/echo

curl -s -X POST http://localhost:9000/api/echo \
  -H 'Content-Type: application/json' \
  -d '{"hello":"world"}'

Docker

Build:

docker build --platform=linux/amd64 -t ruby-rest-api .

Run:

docker run --rm -p 9000:9000 ruby-rest-api

Then open:

• UI: http://localhost:9000/

Configuration

• PORT: port to listen on (default: 9000)
• BIND: bind address (default: 0.0.0.0)

Example:

PORT=8080 bundle exec ruby app.rb