Learn Play - 1 Code Examples & CST Typing Practice Test

Play Framework is a high-velocity, reactive web framework for Java and Scala, designed for building modern web applications and RESTful services. It emphasizes developer productivity, statelessness, and asynchronous I/O.

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Play Simple REST API

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Updated Nov 27, 2025

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Code Sample Descriptions

Play Simple REST API

// app/controllers/ItemController.scala
package controllers

import play.api.mvc._
import play.api.libs.json._
import javax.inject._

case class Item(id: Int, name: String)
object Item { implicit val format = Json.format[Item] }

@Singleton
class ItemController @Inject()(val controllerComponents: ControllerComponents) extends BaseController {

  private var items = Seq(Item(1, "Item 1"), Item(2, "Item 2"))

  def list = Action {
    Ok(Json.toJson(items))
  }

  def add = Action(parse.json) { request =>
    val newItem = request.body.as[Item]
    items = items :+ newItem
    Created(Json.toJson(newItem))
  }
}

// conf/routes
GET     /items          controllers.ItemController.list
POST    /items          controllers.ItemController.add

Demonstrates a simple Play controller with routes for listing and adding items using Scala.

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Frequently Asked Questions about Play

What is Play?

What are the primary use cases for Play?

Building reactive web applications. Creating RESTful APIs. Developing microservices and backend services. Rapid prototyping with hot reload. High-concurrency applications

What are the strengths of Play?

High-performance and scalable. Reactive programming support. Hot reload for faster development. Supports both Java and Scala. Strong community and Lightbend ecosystem integration

What are the limitations of Play?

Smaller ecosystem than Spring Boot or Laravel. Learning curve for reactive and asynchronous programming. Less suitable for small static websites. Requires JVM knowledge. May be overkill for simple CRUD apps

How can I practice Play typing speed?

CodeSpeedTest offers 1+ real Play code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.

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Code Sample Descriptions

Play Simple REST API

// app/controllers/ItemController.scala
package controllers

import play.api.mvc._
import play.api.libs.json._
import javax.inject._

case class Item(id: Int, name: String)
object Item { implicit val format = Json.format[Item] }

@Singleton
class ItemController @Inject()(val controllerComponents: ControllerComponents) extends BaseController {

  private var items = Seq(Item(1, "Item 1"), Item(2, "Item 2"))

  def list = Action {
    Ok(Json.toJson(items))
  }

  def add = Action(parse.json) { request =>
    val newItem = request.body.as[Item]
    items = items :+ newItem
    Created(Json.toJson(newItem))
  }
}

// conf/routes
GET     /items          controllers.ItemController.list
POST    /items          controllers.ItemController.add

Demonstrates a simple Play controller with routes for listing and adding items using Scala.

Let’s Try →

Frequently Asked Questions about Play

What is Play?

What are the primary use cases for Play?

Building reactive web applications. Creating RESTful APIs. Developing microservices and backend services. Rapid prototyping with hot reload. High-concurrency applications

What are the strengths of Play?

High-performance and scalable. Reactive programming support. Hot reload for faster development. Supports both Java and Scala. Strong community and Lightbend ecosystem integration

What are the limitations of Play?

How can I practice Play typing speed?

CodeSpeedTest offers 1+ real Play code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.