Dropwizard is a Java framework for developing ops-friendly, high-performance, RESTful web services. It pulls together stable, mature libraries from the Java ecosystem into a simple, light-weight package that lets you focus on getting things done. 
 
Dropwizard has out-of-the-box support for sophisticated configuration, application metrics, logging, operational tools, and much more, allowing you and your team to ship a production-quality web service in the shortest time possible.
 
Dropwizard straddles the line between being a library and a framework. Its goal is to provide performant, reliable implementations of everything a production-ready web application needs. Because this functionality is extracted into a reusable library, your application remains lean and focused, reducing both time-to-market and maintenance burdens.

Dropwizard is a Java framework for developing ops-friendly, high-performance, RESTful web services. It pulls together stable, mature libraries from the Java ecosystem into a simple, light-weight package that lets you focus on getting things done. 

dropwizard - A damn simple library for building production-ready RESTful web services.

chi is a lightweight, idiomatic and composable router for building Go 1.7+ HTTP services. It's especially good at helping you write large REST API services that are kept maintainable as your project grows and changes. chi is built on the new context package introduced in Go 1.7 to handle signaling, cancelation and request-scoped values across a handler chain. 
The focus of the project has been to seek out an elegant and comfortable design for writing REST API servers, written during the development of the Pressly API service that powers our public API service, which in turn powers all of our client-side applications.

chi is a lightweight, idiomatic and composable router for building Go 1.7+ HTTP services. It's especially good at helping you write large REST API services that are kept maintainable as your project grows and changes. chi is built on the new context package introduced in Go 1.7 to handle signaling, cancelation and request-scoped values across a handler chain.

chi - Lightweight, idiomatic and composable router for building Go HTTP services

Fast HTTP implementation for Go.Currently fasthttp is successfully used by VertaMedia in a production serving up to 200K rps from more than 1.5M concurrent keep-alive connections per physical server. fasthttp server is up to 10 times faster than net/http.

fasthttp - Fast HTTP package for Go

The Dingo API package is meant to provide you, the developer, with a set of tools to help you easily and quickly build your own API. While the goal of this package is to remain as flexible as possible it still won't cover all situations and solve all problems. The package includes Content Negotiation, Rate limiting, Multiple Authentication Adapters, Error and Exception Handling, Response Transformers and Formatters, API Versioning and lot more.

Dingo API  - A RESTful API package for the Laravel and Lumen frameworks

 Restbed is a comprehensive and consistent programming model for building applications that require seamless and secure communication over HTTP, with the ability to model a range of business processes, designed to target mobile, tablet, desktop and embedded production environments. More in-depth examples can be found here. 

RestBed - Asynchronous RESTful functionality to C++11 applications

Ktor is a framework for quickly creating web applications in Kotlin with minimal effort.Ktor Framework doesn't impose a lot of constraints on what technology a project is going to use – logging, templating, messaging, persistent, serializing, dependency injection, etc. Sometimes it may be required to implement a simple interface, but usually it is a matter of writing a transforming or intercepting function. Features are installed into application using unified interception mechanism which allows building arbitrary pipelines.
 
Ktor Application can be hosted in any servlet container with Servlet 3.0+ API support such as Tomcat, or standalone using Netty or Jetty. Support for other hosts can be added through the unified hosting API. Ktor pipeline machinery and API is utilising Kotlin coroutines to provide easy-to-use asynchronous programming model without making it too cumbersome. All host implementations are using asynchronous I/O facilities to avoid thread blocking.

Ktor is a framework for quickly creating web applications in Kotlin with minimal effort. Ktor Framework doesn't impose a lot of constraints on what technology a project is going to use – logging, templating, messaging, persistent, serializing, dependency injection, etc. Sometimes it may be required to implement a simple interface, but usually it is a matter of writing a transforming or intercepting function. Features are installed into application using unified interception mechanism which allows building arbitrary pipelines.

Ktor - Framework for quickly creating connected applications in Kotlin with minimal effort

Micro is an asynchronous HTTP microservices. It is designed for usage with async and await. It does not have middleware, With all dependencies, the package weighs less than a megabyte.

Micro — Asynchronous HTTP microservices

Spark is a micro framework for creating web applications in Kotlin and Java 8 with minimal effort. It is a simple and expressive Java/Kotlin web framework DSL built for rapid development. Sparks intention is to provide an alternative for Kotlin/Java developers that want to develop their web applications as expressive as possible and with minimal boilerplate. With a clear philosophy Spark is designed not only to make you more productive, but also to make your code better under the influence of Spark’s sleek, declarative and expressive syntax.

Spark - A simple expressive web framework for java

Light 4j is a fast, lightweight and cloud native microservices framework. Light means lightweight, lighting fast and shed light on how to program with modern Java SE. It is 44 times faster than the most popular microservices platform Spring Boot embedded Tomcat and use only 1/5 of memory. 
Its features include: 
<ul>
<li>Plugin architecture for startup/shutdown hooks and middleware components</li>
<li>Distributed OAuth2 JWT security verification as part of the framework</li>
<li>Request and response validation against OpenAPI specification at runtime</li>
<li>Metrics collected in influxdb and viewed from Grafana Dashboard for both services and clients</li>
<li>Global exception handling for runtime exception, api exception and other checked exceptions</li>
<li>Mask sensitive data like credit card, sin number etc. before logging</li>
<li>Sanitize cross site scripting for query parameters, request headers and body</li>
<li>Audit to dump important info or entire request and response.</li>
<li>Body parser to support different content types</li>
<li>Standardized response code and messages from configuration file</li>
<li>Externalized configuration for all modules for dockerized environment</li>
<li>CORS pre-flight handler for SPA (Angular or React) from another domain</li>
<li>Rate limiting for services that exposed outside to the Internet</li>
<li>Service registry and discovery support direct, Consul and Zookeeper</li>
<li>Client side discovery and load balance to eliminate proxies</li>
<li>A client module that is tightly integrated with Light-OAuth2 and supports traceability</li>
</ul>

Light 4j is a fast, lightweight and cloud native microservices framework. Light means lightweight, lighting fast and shed light on how to program with modern Java SE. It is 44 times faster than the most popular microservices platform Spring Boot embedded Tomcat and use only 1/5 of memory.

light-4j - A fast, lightweight and more productive microservices framework

RESTEasy is a JBoss project that provides various frameworks to help you build RESTful Web Services and RESTful Java applications. It is a portable implementation of the JAX-RS specification. JAX-RS is a JCP specification that provides a Java API for RESTful Web Services over the HTTP protocol. It is portable to Tomcat and many other app-server. It has rich set of providers for: XML, JSON, YAML, Fastinfoset, Multipart, XOP, Atom, etc.

RESTEasy - Rest Framework for Java

Jersey is a REST framework that provides JAX-RS Reference Implementation and more. Jersey provides its own APIs that extend the JAX-RS toolkit with additional features and utilities to further simplify RESTful service and client development. Jersey also exposes numerous extension SPIs so that developers may extend Jersey to best suit their needs.

Jersey - RESTful Web Services in Java.

Swagger is a powerful open source framework backed by a large ecosystem of tools that helps you design, build, document, and consume your RESTful APIs. The goal of Swagger is to define a standard, language-agnostic interface to REST APIs which allows both humans and computers to discover and understand the capabilities of the service without access to source code, documentation, or through network traffic inspection. 

Swagger - The World's Most Popular API Framework

API Platform is a set of tools to build and consume web APIs. API Platform embraces open web standards (Swagger, JSON-LD, GraphQL, Hydra, HAL, JWT, OAuth, HTTP...) and the Linked Data movement. Your API will automatically expose structured data in Schema.org/JSON-LD. It means that your API Platform application is usable out of the box with technologies of the semantic web.

Api-platform - REST and GraphQL framework to build modern API-driven projects (server-side and client-side)

A Node.js web service framework optimized for building semantically correct RESTful web services ready for production use at scale. restify optimizes for introspection and perfromance, and is used in some of the largest Node.js deployments on Earth. 
 
Running at scale requires the ability to trace problems back to their origin by separating noise from signal. restify is built from the ground up with post-mortem debugging in mind.

A Node.js web service framework optimized for building semantically correct RESTful web services ready for production use at scale. restify optimizes for introspection and perfromance, and is used in some of the largest Node.js deployments on Earth. 

restify - The future of Node.js REST development

Quarkus is a Cloud Native, Container First framework for writing Java applications. A Kubernetes Native Java stack tailored for GraalVM &amp; OpenJDK HotSpot, crafted from the best of breed Java libraries and standards. Quarkus tailors your application for GraalVM and HotSpot. Amazingly fast boot time, incredibly low RSS memory (not just heap size!) offering near instant scale up and high density memory utilization in container orchestration platforms like Kubernetes. It allows developers to automatically generate Kubernetes resources including building and deploying container images without having to manually create YAML files.
Quarkus is based on a&nbsp;<a href="https://quarkus.io/version/main/guides/quarkus-reactive-architecture" target="_blank" rel="noopener">reactive core</a> allowing your application to mix reactive and imperative components. It helps to compose asynchronous operations and complete the result when everything is done without blocking the I/O threads using <a href="https://quarkus.io/version/main/guides/mutiny-primer" target="_blank" rel="noopener">Mutiny Reactive API</a>.&nbsp;&nbsp;

Quarkus is a Cloud Native, Container First framework for writing Java applications. A Kubernetes Native Java stack tailored for GraalVM & OpenJDK HotSpot, crafted from the best of breed Java libraries and standards. Quarkus tailors your application for GraalVM and HotSpot. Amazingly fast boot time, incredibly low RSS memory (not just heap size!) offering near instant scale up and high density memory utilization in container orchestration platforms like Kubernetes. 

Quarkus - Supersonic Subatomic Java

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