JSON++ is a light-weight JSON parser, writer and reader written in C++. JSON++ can also convert JSON documents into lossless XML documents.
If you've made substantial contribution, please add your link here.
Perhaps because web service clients are usually written in dynamic languages these days, none of the existing C++ JSON parsers fitted my needs very well, so I wrote one that I used in another project. My goals for JSON++ were:
Other contributors have sinced added more functionalities:
You need a modern C++ compiler. For older compilers, please try legacy branch.
JSONxx can parse JSON documents both in strict or permissive mode.
When jsonxx::Settings::Parser
is set to Strict
, JSONxx parser will accept:
When jsonxx::Settings::Parser
is set to Permissive
, JSONxx parser will accept:
{ "array": [0,1,2,], }
['hello', "world"]
{ "width": 320, "height": 240 } //Picture details
Default value is Permissive
.
When jsonxx::Settings::UnquotedKeys
is set to Enabled
, JSONxx parser will accept:
{name: "world"}
Default value is Disabled
.
JSONxx uses internally JSONXX_ASSERT(...)
macro that works both in debug and release mode. Set jsonxx::Settings::Assertions
value to Disabled
to disable assertions.
Default value is Enabled
.
The following snippets are from one of the unit tests. They are quite self-descriptive.
using namespace std;
using namespace jsonxx;
string teststr(
"{"
" \"foo\" : 1,"
" \"bar\" : false,"
" \"person\" : {\"name\" : \"GWB\", \"age\" : 60,},"
" \"data\": [\"abcd\", 42],"
"}"
);
// Parse string or stream
Object o;
assert(o.parse(teststr));
// Validation. Checking for JSON types and values as well
assert(1 == o.get<Number>("foo"));
assert(o.has<Boolean>("bar"));
assert(o.has<Object>("person"));
assert(o.get<Object>("person").has<Number>("age"));
assert(!o.get<Object>("person").has<Boolean>("old"));
assert(o.get<Object>("person").get<Boolean>("old", false));
assert(o.has<Array>("data"));
assert(o.get<Array>("data").get<Number>(1) == 42);
assert(o.get<Array>("data").get<String>(0) == "abcd");
assert(o.get<Array>("data").get<String>(2, "hello") == "hello");
assert(!o.has<Number>("data"));
cout << o.json() << endl; // JSON output
cout << o.xml(JSONx) << endl; // JSON to XML conversion (JSONx subtype)
cout << o.xml(JXML) << endl; // JSON to XML conversion (JXML subtype)
cout << o.xml(JXMLex) << endl; // JSON to XML conversion (JXMLex subtype)
// Generate JSON document dynamically
using namespace std;
using namespace jsonxx;
Array a;
a << 123;
a << "hello world";
a << 3.1415;
a << 99.95f;
a << 'h';
a << Object("key", "value");
Object o;
o << "key1" << "value";
o << "key2" << 123;
o << "key3" << a;
cout << o.json() << endl;
Author: hjiang
Source: https://github.com/hjiang/jsonxx
License: MIT license