For Clojure & ClojureScript users Transit delivers little new in terms of feature set over EDN but the performance gains are quite significant. transit-cljs is

For Clojure & ClojureScript users Transit delivers little new in terms of feature set over EDN but the performance gains are quite significant. transit-cljs is up to 18-20X faster than cljs.reader/read-string on the EDN equivalent. Under V8 JS environments (Chrome, Opera, Node.js) I consistently see transit-cljs outperform JSON.parse on the equivalent data. In addition transit-cljs is a great way to consume JSON endpoints from ClojureScript without the massive perf hit of cljs.core/js->clj. You can also trivially spit out JSON from ClojureScript via transit-cljs as long as your map keys are strings and not keywords using a json-verbose Transit writer.