diff --git a/src/common/db2.h b/src/common/db2.h
index c6dc430..94066ed 100644
--- a/src/common/db2.h
+++ b/src/common/db2.h
@@ -253,6 +253,11 @@ struct db2 {
 
         files(auto &&db, auto &&base) : db{db}, tab_{base}, ind_{base}, dat_{base} {}
 
+        void alloc(auto sz) {
+            tab_.f.alloc_raw(sz);
+            ind_.f.alloc_raw(sz);
+            dat_.f.alloc_raw(sz);
+        }
         auto get_files() const {
             return std::set<path>{tab_.fn,ind_.fn,dat_.fn};
         }
@@ -293,11 +298,17 @@ struct db2 {
         }
     };
 
+    auto alloc() {
+        files{*this,fn}.alloc(0);
+    }
     auto open() {
-        return files{*this,fn};
+        return files{*this, fn};
     }
 
 private:
+    std::string utf8_to_dbstr(const std::string &s) const {
+        return utf8_to_dbstr((const char8_t *)s.c_str());
+    }
     std::string utf8_to_dbstr(const char *s) const {
         return utf8_to_dbstr((const char8_t *)s);
     }
diff --git a/src/db_extractor2/db_extractor2.cpp b/src/db_extractor2/db_extractor2.cpp
index aec1c03..aa7c5d9 100644
--- a/src/db_extractor2/db_extractor2.cpp
+++ b/src/db_extractor2/db_extractor2.cpp
@@ -24,6 +24,7 @@
 #include <primitives/sw/main.h>
 #include <primitives/sw/settings.h>
 #include <primitives/sw/cl.h>
+#include <nlohmann/json.hpp>
 
 #include <fstream>
 #include <span>
@@ -38,7 +39,7 @@ int main(int argc, char *argv[])
     db2 db{db_fn};
     auto f = db.open();
 
-    auto tbl2 = f.find_table(u8"Глайдеры");
+    /*auto tbl2 = f.find_table(u8"Глайдеры");
     auto valuexxx = tbl2.find_value("GL_S3_PS_FINDER2");
     auto valuexxx2 = tbl2.find_value("GL_TEST_XXX");
     valuexxx2.set_field("NAME", "X");
@@ -55,18 +56,27 @@ int main(int argc, char *argv[])
     valuexxx2.set_field("VW2", 6.3f);
 
     f(u8"Глайдеры", "GL_S3_PS_FINDER2", "NAME") = "xx";
-    f(u8"Глайдеры", "GL_S3_PS_FINDER2", "VW2") = 4.3f;
+    f(u8"Глайдеры", "GL_S3_PS_FINDER2", "VW2") = 4.3f;*/
 
     auto tbl = f.tab_.data->tables();
     auto fields = f.tab_.data->fields();
     auto values = f.ind_.data->values();
 
-    std::string spaceval(4, ' ');
-    std::string spacefield(8, ' ');
+    auto prepare_string = [](auto &&in) {
+        auto s = str2utf8(in);
+        boost::trim(s);
+        return s;
+    };
+
+    nlohmann::json ja;
     for (auto &&t : tbl) {
-        std::println("{}:", t.name);
+        auto &jt = ja[prepare_string(t.name)];
         for (auto &&v : values | std::views::filter([&](auto &v){return v.table_id == t.id;})) {
-            std::println("{}{}:", spaceval, v.name);
+            auto vn = prepare_string(v.name);
+            if (jt.contains(vn)) {
+                throw std::logic_error{"duplicate"};
+            }
+            auto &jv = jt[vn];
             auto max = f.dat_.f.p + v.offset + v.size;
             auto p = f.dat_.f.p + v.offset;
             while (p < max) {
@@ -80,19 +90,19 @@ int main(int argc, char *argv[])
                 case db2::field_type::integer: {
                     auto fv = (int*)p;
                     p += vb->size;
-                    std::println("{}{}: {}", spacefield, f->name, *fv);
+                    jv[prepare_string(f->name)] = *fv;
                     break;
                 }
                 case db2::field_type::float_: {
                     auto fv = (float*)p;
                     p += vb->size;
-                    std::println("{}{}: {}", spacefield, f->name, *fv);
+                    jv[prepare_string(f->name)] = *fv;
                     break;
                 }
                 case db2::field_type::string: {
                     auto fv = (const char*)p;
                     p += vb->size;
-                    std::println("{}{}: {}", spacefield, f->name, fv);
+                    jv[prepare_string(f->name)] = prepare_string(fv);
                     break;
                 }
                 default: {
@@ -102,6 +112,28 @@ int main(int argc, char *argv[])
             }
         }
     }
+    write_file(path{db_fn} += ".json", ja.dump(1));
+
+    db2 x{path{db_fn} += "new"};
+    x.alloc();
+    auto newdb = x.open();
+    for (auto &&[t,vals] : ja.items()) {
+        for (auto &&[v,fields] : vals.items()) {
+            for (auto &&[f,val] : fields.items()) {
+                auto s = newdb(t, v, f);
+                if (0) {
+                } else if (val.is_number_float()) {
+                    s = val.get<float>();
+                } else if (val.is_number_integer()) {
+                    s = val.get<int>();
+                } else if (val.is_string()) {
+                    s = val.get<std::string>();
+                } else {
+                    throw std::logic_error{"bad type"};
+                }
+            }
+        }
+    }
 
     return 0;
 }
diff --git a/sw.cpp b/sw.cpp
index 7bf25a1..a7fc3e9 100644
--- a/sw.cpp
+++ b/sw.cpp
@@ -47,7 +47,7 @@ void build(Solution &s)
 
     add_exe_with_data_manager("db_add_language") += "pub.egorpugin.primitives.executor"_dep;
     add_exe_with_data_manager("db_extractor");
-    add_exe_with_data_manager("db_extractor2");
+    add_exe_with_data_manager("db_extractor2") += "org.sw.demo.nlohmann.json.natvis"_dep;
     add_exe_with_data_manager("mmm_extractor");
     add_exe_with_data_manager("mmo_extractor");
     add_exe_with_common("mmo_extractor2");