Defined in header <nlohmann/json_view.hpp>
using json_editable_document = basic_json_document<json, true>;
This type is an editable basic_json_document of the default json specialization: in addition to everything json_document offers, set and push_back change values after parsing, without ever rewriting the source text -- see Edits and Editing a document.
??? example
The example below patches two fields of a small configuration document -- changing one and adding another --
and dumps it back out with the member order and the spelling of the untouched number preserved, something a
plain [`json`](json.md) value cannot do.
```cpp
#include <iostream>
#include <nlohmann/json_view.hpp>
using json = nlohmann::json;
using json_editable_document = nlohmann::json_editable_document;
using json_editable_view = nlohmann::json_editable_view;
int main()
{
// a configuration file, as it might be read from disk
const std::string text = R"({"name": "cache", "host": "db1", "port": 6379, "price": 19.90})";
std::cout << text << "\n\n";
// patch two fields -- "price" is never touched
json_editable_document doc = json_editable_document::parse(text);
doc.set(doc.root(), "host", "db2");
doc.set(doc.root(), "retries", 3);
// member order (the new member at the end) and the untouched number's
// exact spelling survive
std::cout << doc.root().dump(-1, ' ', false, json_editable_view::number_format::source) << '\n';
// the same patch on a plain json value: keys are sorted (object_t is a
// std::map), and "price" is rewritten even though the patch never
// touched it
json plain = json::parse(text);
plain["host"] = "db2";
plain["retries"] = 3;
std::cout << plain.dump() << '\n';
}
```
Output:
```json
{"name": "cache", "host": "db1", "port": 6379, "price": 19.90}
{"name":"cache","host":"db2","port":6379,"price":19.90,"retries":3}
{"host":"db2","name":"cache","port":6379,"price":19.9,"retries":3}
```
json_editable_documentordered_jsonAdded in version 3.13.0.