Clojure Validation Projects

malli

33 1,415 9.3 Clojure

High-performance data-driven data specification library for Clojure/Script.

Project mention: A History of Clojure (2020) [pdf] | news.ycombinator.com | 2023-08-10

truss

4 296 6.1 Clojure

Assertions micro-library for Clojure/Script (by taoensso)

Project mention: Java 21: What’s New? | news.ycombinator.com | 2023-08-09

When type checking is needed, I find the Truss library* does the trick quite well.
As for the syntax, there is very little, which can make it a harder lift but once you have the hang of it you won't deal with the issues identified in the parent comment.
* https://github.com/taoensso/truss

InfluxDB

www.influxdata.com sponsored

Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).