Is there a way of format just making a pretty print without changing the key's orders ?

[zhishupp]

for example, format like this, just adjust the indent, not change key's orders

{
	"arp table":	[{
			"Bucket":	88,
			"IPv4":	"1.0.0.1",
			"MAC":	"83:84:D4:D8:C6:AA",
			"Expire":	"static"
		}, {
			"Bucket":	998,
			"IPv4":	"1.0.0.2",
			"MAC":	"83:84:D4:D8:C6:BB",
			"Expire":	"static"
		}]
}

{
    "arp table": [
        {
            "Bucket": 88,
            "IPv4": "1.0.0.1",
            "MAC": "83:84:D4:D8:C6:AA",
            "Expire": "static"
        },
        {
            "Bucket": 998,
            "IPv4": "1.0.0.2",
            "MAC": "83:84:D4:D8:C6:BB",
            "Expire": "static"
        }
    ]
}

[nlohmann]

No, this is not possible at the moment.

See #660 #106 #424

[zhishupp]

void prettyJson(std::string& pretty_json, const std::string& json_string, std::string::size_type& pos, size_t le, size_t indent = JSON_INDENT)
{
    bool in_string = false;
    for (; pos < json_string.length(); ++pos)
    {
        char curr_char = json_string[pos];
        if ((curr_char == ' ' || curr_char == '\t') && !in_string)
        {
            continue;
        }
        else if ((curr_char == '\r' || curr_char == '\n') && !in_string)
        {
            continue;
        }
        else if ((curr_char == '{' || curr_char == '[') && !in_string)
        {
            pretty_json.append(1, curr_char);
            pretty_json.append(1, '\n');
            pretty_json.append((le + 1) * indent, ' ');
            prettyJson(pretty_json, json_string, ++pos, le + 1, indent);
        }
        else if ((curr_char == '}' || curr_char == ']') && !in_string)
        {
            pretty_json.append(1, '\n');
            pretty_json.append((le - 1) * indent, ' ');
            pretty_json.append(1, curr_char);
            return;
        }
        else if (curr_char == ':' && !in_string)
        {
            pretty_json.append(1, curr_char);
            pretty_json.append(1, ' ');
        }
        else if (curr_char == ',' && !in_string)
        {
            pretty_json.append(1, curr_char);
            pretty_json.append(1, '\n');
            pretty_json.append(le * indent, ' ');
        }
        else if (curr_char == '"')
        {
            char last_char = (pos == 0) ? 0 : json_string[pos - 1];
            if (last_char != '\\')
            {
                pretty_json.append(1, curr_char);
                in_string = !in_string;
            }
        }
        else
        {
            pretty_json.append(1, curr_char);
        }
    }
}

maybe this function can help a little

            std::string json_string = "{\"root\":{\"result\":0,\"description\":\"flush success\"},\"config\":{\"result\":0,\"description\":\"flush success\"},\"query\":{\"result\":0,\"description\":\"flush success\"},\"dump\":{\"result\":0,\"description\":\"flush success\"}}";
            std::string pretty_json;
            std::string::size_type pos = 0;
            size_t le = 0;
            prettyJson(pretty_json, json_string, pos, le);

result:

{
    "root": {
        "result": 0,
        "description": "flush success"
    },
    "config": {
        "result": 0,
        "description": "flush success"
    },
    "query": {
        "result": 0,
        "description": "flush success"
    },
    "dump": {
        "result": 0,
        "description": "flush success"
    }
}