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== `sqlite/json.hpp`
The json header provides integration with boost/json.
[source,cpp]
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// The subtype value used by the sqlite json extension. See the [sqlite reference](https://www.sqlite.org/json1.html)
constexpr int json_subtype = static_cast<int>('J');
// Allow json to be used as a result from functions or vtables
void tag_invoke(const struct set_result_tag &, sqlite3_context * ctx, const json::value & value);
// Check if the value or field is a json.
bool is_json(const value & v);
bool is_json(const field & f);
//Convert the value or field to a json.
json::value as_json(const value & v, json::storage_ptr ptr = {});
json::value as_json(const field & f, json::storage_ptr ptr = {});
// Allow conversions to boost::json::value
void tag_invoke( const json::value_from_tag &, json::value& val, const value & f);
void tag_invoke( const json::value_from_tag &, json::value& val, const field & f);
void tag_invoke( const json::value_from_tag &, json::value& val, resultset && rs);
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