Customising form validation in Javalin using Valiktor

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Justus Brugman

Since about a month I’m developing some microservices using Javalin, a small, simple and lightweight web-framework that started as a fork from SparkJava. By now it’s a ground-up rewrite, influenced by the Javascript framework koa.js. Don’t let the stuff like Either scare you, we use the Arrow library to make our life a bit more easy :)

When requesting user input from a form, it’s evident that we need to validate our input. Javalin has its own way of doing so (from the docs):

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