Fastest
JVM Framework
for Building APIs
Backend in minutes. Not weeks.
Convention over configuration meets modern developer workflows.
Spring Boot, but fast.
One Groovy class. Fully scaffolded API. Grails gives you everything you need—and nothing you don’t.
package com.example
import grails.gorm.annotation.*
@Entity
class Book {
String title
String author
String isbn
BigDecimal price
Date dateCreated
Date lastUpdated
static constraints = {
title blank: false, maxSize: 255
author blank: false
isbn unique: true
price min: 0.0
}
}Click "Run" to see the API response
Your domain. Your data. Your API—live in minutes.
Start building in minutes—no config, no ceremony.
Grails gives you sane defaults, scaffolded APIs, and a clear project structure so you can focus on your app—not your setup. Perfect for solo devs and seasoned teams alike.
Everything you love about Spring—without the boilerplate.
Grails wraps Spring Boot’s power in a developer-friendly layer, with built-in support for dependency injection, validation, routing, and testing—zero XML, zero pain.
Bring your Java code. Add Groovy power.
Grails runs on the JVM and integrates seamlessly with your existing Java libraries, infrastructure, and containers—so you keep your ecosystem, and gain speed.