JSBool JS_StringToValue()

JSBool JS_StringToValue(JSContext *cx, unsigned short *bytes, uint sz, jsval *vp);

Method; stores a string return value in a jsval structure. It allocates a new JavaScript string object.

JSContext *cx, unsigned short *bytes, size_t sz, jsval *vp

The cx argument is the opaque JSContext pointer that passes to the JavaScript function.
The bytes argument is the string to be stored in the jsval structure. The string data is copied, so the caller should free the string when it is not needed. If the string size is not specified (see the sz argument), the string must be null-terminated.
The sz argument is the size of the string, in bytes. If sz is 0, the length of the null-terminated string is computed automatically.
The vp argument is a pointer to the jsval structure into which the contents of the string should be copied.

A Boolean value: JS_TRUE indicates success; JS_FALSE indicates failure.