JSON Type Definition, aka RFC 8927, is an easy-to-learn, standardized way to define a schema for JSON data. You can use JSON Typedef to portably validate data across programming languages, create dummy data, generate code, and more. jtd-infer is a tool that can generate a JSON Typedef schema from example data. It lives on GitHub here. This article will go over why jtd-infer may be useful to you, how to install it, and then go through an example of using jtd-infer on a few real-world datasets.