What is Javalin?

In Javalin, classes are rarely extended, and interfaces are seldom implemented, reflecting the framework's minimalist approach. Built upon Jetty, Javalin comprises only a few thousand lines of code, which enables it to achieve performance levels comparable to Jetty's native implementation. Its concise codebase facilitates an easy understanding of the source material for developers. Unlike numerous other web frameworks in Java and Kotlin, which typically offer distinct versions for each language, Javalin is designed for seamless interoperability, allowing developers to create applications in a consistent manner across both Java and Kotlin. Operating on Jetty—one of the most trusted and widely used web servers for the JVM—Javalin provides extensive configuration options, including support for SSL, HTTP/3, and all the features inherent to Jetty. Additionally, while many lightweight web frameworks in Java and Kotlin often lack OpenAPI support, Javalin incorporates this capability, making it a more flexible choice for developers. This unique combination of features positions Javalin as an exceptional option for efficiently building contemporary web applications that can easily adapt to various requirements.

Integrations

Offers API?:
Yes, Javalin provides an API

Screenshots and Video

Javalin Screenshot 1

Company Facts

Company Name:
Javalin
Company Website:
javalin.io

Product Details

Deployment
SaaS
Training Options
Documentation Hub
Support
Web-Based Support

Product Details

Target Company Sizes
Individual
1-10
11-50
51-200
201-500
501-1000
1001-5000
5001-10000
10001+
Target Organization Types
Mid Size Business
Small Business
Enterprise
Freelance
Nonprofit
Government
Startup
Supported Languages
English

Javalin Categories and Features

Javalin Customer Reviews

Write a Review
  • Reviewer Name: A Verified Reviewer
    Position: Developer
    Has used product for: 2+ Years
    Uses the product: Weekly
    Org Size (# of Employees): 1 - 25
    Feature Set
    Layout
    Ease Of Use
    Customer Service
    Would you Recommend to Others?
    1 2 3 4 5 6 7 8 9 10

    Java friendly

    Date: Nov 04 2025
    Summary

    Overall it is very fast in speed compare to 'FASTAPI' because it is in java.
    I can proudly say that people who want to create a 'APIS' in java but do not want to be a part of 'SPRING' than this is for them.

    Positive

    Good for java developer who want to create there own project but do not want to integrate spring boot. It is fast and modern which is extremely fast.

    Negative

    It may require some good knowledge of java before using it. you would doing many manual configurations most of the time but atleast not in 'XML'.

    Read More...
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