json_write/2

Module

This predicate is provided by json.pl.

Load this module before using the predicate:

:- consult('/v1/lib/json.pl').

Description

Writes Term as JSON text to Stream.

Signature

json_write(+Stream, +Term) is det

Examples

Write a canonical Prolog JSON term to a stream

This scenario demonstrates writing a Prolog JSON term to the current output stream.

Here are the steps of the scenario:

• Given the module configuration:

{
  "limits": {
    "max_user_output_size": 50
  }
}

• Given the program:

:- consult('/v1/lib/json.pl').

json_write_to_output(Term) :-
  current_output(Stream),
  json_write(Stream, Term).

• Given the query:

json_write_to_output(json([foo=bar,ok= @(true)])).

• When the query is run
• Then the answer we get is:

height: 42
gas_used: 11668
answer:
  has_more: false
  variables:
  results:
  - substitutions:
user_output: |
  {"foo":"bar","ok":true}