code : open Yojson (* Define an OCaml type *) type person = { name : string; age : int; } [@@deriving to_yojson] (* Example person *) let my_person = { name = "Alice"; age = 30 } (* let xx = person_to_yojson my_person *) (* Convert person to JSON and store in a file *) let store_person_as…

You should also have a preprocess directive to invoke the pre-processor. Something like (preprocess (pps ppx_deriving_yojson)) in the executable stanza (e.g. just after libraries). Also, note that if the type you want to print is not defined by you but by some other library and the library itself d…

Yojson and ppx_deriving_yojson

Learning

ashu414 February 12, 2024, 10:42am 8

@emillon @K_N Facing one more issue, can you please help me
Issue Thread : Not able to use %{d}_to_yojson in different path

Topic		Replies	Views
Serializing a record to JSON with ppx_yojson_conv? Learning	8	1796	October 29, 2021
Json of a data structure Learning	3	437	February 9, 2024
JSON PPX derivers thread Ecosystem ppx_deriving_yojson	6	279	August 12, 2025
Not able to use %{d}_to_yojson in different path Learning ppx , dune	1	266	February 12, 2024
Viewing to_yojson and of_yojson implementation for types Learning ppx , yojson , ppx_deriving_yojson	6	463	July 7, 2025

Yojson and ppx_deriving_yojson

Related topics