Im pretty clear on how to parse JSON from http requests. But I have a JSON file locally I would like to use within my code.
I have tried to find a solution on google but I am struggling to figure out how to read a local JSON file from the file system
Thanks
Vinn
Use clojure/data.json library:
project.clj:[org.clojure/data.json "2.4.0"]
(:require [clojure.data.json :as json])
{"name":"John", "age":30, "car":null}
and read it like this:
(json/read-str (slurp "filename.json"))
=> {"name" "John", "age" 30, "car" nil}
Syntax error (ClassNotFoundException) compiling at (...) clojure.data.json.Well, what's the difference between a json arriving from an http request and a json arriving from a local file? I suppose the real question then is "how to read from a local file", no?
Here is how to read a json from a string using clojure/data.json:
(def json-str (json/read-str "{\"a\":1,\"b\":{\"c\":\"d\"}}"))
Now, lets put the same string into a file
echo '{"a":1,"b":{"c":"d"}}' > /tmp/a.json
And lets read it from the file:
(def from-file (slurp "/tmp/a.json"))
(def json-file (json/read-str from-file))
Make sure they are the same:
(when (= json-str json-file)
(println "same" json-file))
Which would print "same" and the parsed json value.
In clojure you can use the dep:
cheshire {:mvn/version "5.10.1"}
import the class:
:require
[cheshire.core :as json]
and use this function and return you a mapp
(defn read-invoice [file-path]
(with-open [rdr (io/reader file-path)]
(json/parse-stream rdr true)))
