how to convert v8::Value to json string

[Yong Wang]

Hi all,

    I do not find any api can convert v8::Value to json string. 

Could someone can give me a help?

   thanks in advance.

    

[Ben Noordhuis]

There is no API method but what you can do is look up the 'JSON'
property on the global object, then call the 'stringify' method with
your v8::Value as the argument.

[Yong Wang]

I see, thanks

在 2016年3月2日星期三 UTC+8下午7:08:32，Ben Noordhuis写道：

[Pavel Medvedev]

I use built-in JSON.stringify() like this:

/// Stringify V8 value to JSON /// return empty string for empty value std::string json_str(v8::Isolate* isolate, v8::Handle<v8::Value> value) {     if (value.IsEmpty())     {         return std::string();     }       v8::HandleScope scope(isolate);       v8::Local<v8::Object> json = isolate->GetCurrentContext()->         Global()->Get(v8::String::NewFromUtf8(isolate, "JSON"))->ToObject();     v8::Local<v8::Function> stringify = json->Get(v8::String::NewFromUtf8(isolate, "stringify")).As<v8::Function>();       v8::Local<v8::Value> result = stringify->Call(json, 1, &value);     v8::String::Utf8Value const str(result);       return std::string(*str, str.length());  }

By the way, there is v8::JSON::Parse() function in V8 API, and I'm wondered why there is no v8::JSON::Stringify() counterpart.

[Jochen Eisinger]

On Fri, Mar 4, 2016 at 12:39 PM Pavel Medvedev <pmed...@gmail.com> wrote:

I use built-in JSON.stringify() like this:

/// Stringify V8 value to JSON /// return empty string for empty value std::string json_str(v8::Isolate* isolate, v8::Handle<v8::Value> value) {     if (value.IsEmpty())     {         return std::string();     }       v8::HandleScope scope(isolate);       v8::Local<v8::Object> json = isolate->GetCurrentContext()->         Global()->Get(v8::String::NewFromUtf8(isolate, "JSON"))->ToObject();     v8::Local<v8::Function> stringify = json->Get(v8::String::NewFromUtf8(isolate, "stringify")).As<v8::Function>();       v8::Local<v8::Value> result = stringify->Call(json, 1, &value);     v8::String::Utf8Value const str(result);       return std::string(*str, str.length());  }

By the way, there is v8::JSON::Parse() function in V8 API, and I'm wondered why there is no v8::JSON::Stringify() counterpart.

Mainly because there's no C++ stringifier in V8. There's a basic stringifier, but it doesn't support to full glory of proxies, etc..

 

On Wednesday, March 2, 2016 at 11:00:48 AM UTC+3, Yong Wang wrote:

Hi all,

    I do not find any api can convert v8::Value to json string. 

Could someone can give me a help?

   thanks in advance.

    

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