adding separate characters in dumped json strings

[hygxy]

The idea comes from the fact that the python JSON library adds additional separated characters when dumping JSON objects to strings. For example.

import json
json.dumps({
        'Type': 'COMMAND',
        'ID': 'SET_PARAMS',
        'Payload': {
            'MPR.save_dir': r'',
            'MPR.read_from_file': 0.0,
            'Cfg.inCarGeneralData.EngineIsOn': 1,
            'Cfg.inCarGeneralData.sbr': [1, 1, 1, 1, 1, 1, 1],
            'Cfg.inCarGeneralData.doors': [1, 1, 1, 1]
            }
        })

The dumped string is as follows:

'{"Type": "COMMAND", "ID": "SET_PARAMS", "Payload": {"MPR.save_dir": "", "MPR.read_from_file": 0.0, "Cfg.inCarGeneralData.EngineIsOn": 1, "Cfg.inCarGeneralData.sbr": [1, 1, 1, 1, 1, 1, 1], "Cfg.inCarGeneralData.doors": [1, 1, 1, 1]}}'

However, with this library, the following C++ code snippet

#include <nlohmann/json.hpp>
using ordered_json = nlohmann::ordered_json;

  ordered_json j1 = {
        {"Type", "COMMAND"},
        {"ID", "SET_PARAMS"},
        {"Payload", {
             {"MPR.save_dir", ""},
             {"MPR.read_from_file", 0.0},
             {"Cfg.inCarGeneralData.EngineIsOn", 1},
             {"Cfg.inCarGeneralData.sbr", {1, 1, 1, 1, 1, 1, 1}},
             {"Cfg.inCarGeneralData.doors", {1, 1, 1, 1}}
            }
        }
    };

    std::cout << j1.dump() << std::endl;

generates unseparated string as follows:

{"Type":"COMMAND","ID":"SET_PARAMS","Payload":{"MPR.save_dir":"","MPR.read_from_file":0.0,"Cfg.inCarGeneralData.EngineIsOn":1,"Cfg.inCarGeneralData.sbr":[1,1,1,1,1,1,1],"Cfg.inCarGeneralData.doors":[1,1,1,1]}}

The question is : can we achieve the same result(separated string) as in the python JSON library case? in the library or application level?

[nlohmann]

Not, it is not possible in the moment to just add spaces after commas or colons.

You can provide a parameter to dump to set the indentation:

std::cout << j1.dump(2) << std::endl;

{
  "Type": "COMMAND",
  "ID": "SET_PARAMS",
  "Payload": {
    "MPR.save_dir": "",
    "MPR.read_from_file": 0.0,
    "Cfg.inCarGeneralData.EngineIsOn": 1,
    "Cfg.inCarGeneralData.sbr": [
      1,
      1,
      1,
      1,
      1,
      1,
      1
    ],
    "Cfg.inCarGeneralData.doors": [
      1,
      1,
      1,
      1
    ]
  }
}

[nlohmann]

Do you need further assistance with this issue?

[hygxy]

Hi Niels. Thanks for your help again, I don´t need any further assistance, you can close this issue now.

…

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