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nlohmann committed 2026-10-12 07:35:31 +00:00
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@@ -29,11 +29,60 @@ For more information, see [JSON With Commas and Comments (JWCC)](https://nigelta
When calling `parse` without additional argument, a parse error exception is thrown. If `ignore_trailing_commas` is set to `#!cpp true`, the trailing commas are ignored during parsing:
```cpp
--8<-- "examples/trailing_commas.cpp"
#include <iostream>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
int main()
{
std::string s = R"(
{
"planets": [
"Mercury",
"Venus",
"Earth",
"Mars",
"Jupiter",
"Uranus",
"Neptune",
]
}
)";
try
{
json j = json::parse(s);
}
catch (json::exception& e)
{
std::cout << e.what() << std::endl;
}
json j = json::parse(s,
/* callback */ nullptr,
/* allow exceptions */ true,
/* ignore_comments */ false,
/* ignore_trailing_commas */ true);
std::cout << j.dump(2) << '\n';
}
```
Output:
```
--8<-- "examples/trailing_commas.output"
[json.exception.parse_error.101] parse error at line 11, column 9: syntax error while parsing value - unexpected ']'; expected '[', '{', or a literal
{
"planets": [
"Mercury",
"Venus",
"Earth",
"Mars",
"Jupiter",
"Uranus",
"Neptune"
]
}
```