jguyon / JsonCodec

JSON combinator library for BuckleScript/Reason

JsonCodec

JSON combinator library for BuckleScript/Reason

Using the magic of pickler combinators, this library allows you to parse and serialize JSON structures in a declarative way, free of boilerplate.

Here's a little example:

let json = {js|
{
    "name": "Great Pyramid of Giza",
    "lat": 29.979175,
    "lon": 31.134358,
    "height": 146.5
}
|js};

/* Define a codec for the above object type */
let codec =
  JsonCodec.(
    object4
      (field "name" string) (field "lat" number) (field "long" number) (field "height" number)
  );

/* Decoding */
let () =
  switch (JsonCodec.decodeJson codec json) {
  | Js.Result.Ok (name, lat, lon, height) =>
    Printf.printf "name='%s' location=%f,%f height=%f\n" name lat lon height
  | Js.Result.Error error => Printf.printf "Decoding error: %s" error
  };

/* Encoding */
let encoded = JsonCodec.encodeJson codec ("Machu Picchu", -13.163333, -72.545556, 2430.0);

let () = Printf.printf "JSON: %s\n" encoded;

© 2017 State Machine Systems Ltd. Apache Licence, Version 2.0