diff --git a/deps/db/src/logseq/db/common/entity_util.cljs b/deps/db/src/logseq/db/common/entity_util.cljs
index a21736b5f1..97efc7f07f 100644
--- a/deps/db/src/logseq/db/common/entity_util.cljs
+++ b/deps/db/src/logseq/db/common/entity_util.cljs
@@ -1,6 +1,7 @@
 (ns logseq.db.common.entity-util
   "Lower level entity util fns for DB and file graphs"
-  (:require [logseq.db.file-based.entity-util :as file-entity-util]
+  (:require [datascript.impl.entity :as de]
+            [logseq.db.file-based.entity-util :as file-entity-util]
             [logseq.db.frontend.entity-util :as entity-util]))
 
 (defn whiteboard?
@@ -17,3 +18,9 @@
   [entity]
   (or (entity-util/page? entity)
       (file-entity-util/page? entity)))
+
+(defn entity->map
+  "Convert a db Entity to a map"
+  [e]
+  (assert (de/entity? e))
+  (assoc (into {} e) :db/id (:db/id e)))
diff --git a/deps/db/src/logseq/db/common/view.cljs b/deps/db/src/logseq/db/common/view.cljs
index 96c9218114..0e172123c0 100644
--- a/deps/db/src/logseq/db/common/view.cljs
+++ b/deps/db/src/logseq/db/common/view.cljs
@@ -318,11 +318,7 @@
       (get-entities-for-all-pages db sorting property-ident {:db-based? db-based?})
 
       :class-objects
-      (let [class-id view-for-id
-            class-children (db-class/get-structured-children db class-id)
-            class-ids (distinct (conj class-children class-id))
-            datoms (mapcat (fn [id] (d/datoms db :avet :block/tags id)) class-ids)]
-        (keep (fn [d] (non-hidden-e (:e d))) datoms))
+      (db-class/get-class-objects db view-for-id)
 
       :property-objects
       (->>
diff --git a/deps/db/src/logseq/db/frontend/class.cljs b/deps/db/src/logseq/db/frontend/class.cljs
index 77455564c0..a26df9fe75 100644
--- a/deps/db/src/logseq/db/frontend/class.cljs
+++ b/deps/db/src/logseq/db/frontend/class.cljs
@@ -7,6 +7,7 @@
             [flatland.ordered.map :refer [ordered-map]]
             [logseq.common.defkeywords :refer [defkeywords]]
             [logseq.db.frontend.db-ident :as db-ident]
+            [logseq.db.frontend.entity-util :as entity-util]
             [logseq.db.frontend.rules :as rules]
             [logseq.db.sqlite.util :as sqlite-util]))
 
@@ -173,3 +174,14 @@
   "Determines if namespace string is a user class"
   [s]
   (string/includes? s ".class"))
+
+(defn get-class-objects
+  "Get class objects including children classes'"
+  [db class-id]
+  (let [class-children (get-structured-children db class-id)
+        class-ids (distinct (conj class-children class-id))
+        datoms (mapcat (fn [id] (d/datoms db :avet :block/tags id)) class-ids)
+        non-hidden-e (fn [id] (let [e (d/entity db id)]
+                                (when-not (entity-util/hidden? e)
+                                  e)))]
+    (keep (fn [d] (non-hidden-e (:e d))) datoms)))
diff --git a/src/main/frontend/db/model.cljs b/src/main/frontend/db/model.cljs
index 1807ab5e4c..bc702411bc 100644
--- a/src/main/frontend/db/model.cljs
+++ b/src/main/frontend/db/model.cljs
@@ -1,14 +1,12 @@
 (ns frontend.db.model
   "Core db functions."
-  (:require [clojure.set :as set]
-            [clojure.string :as string]
+  (:require [clojure.string :as string]
             [clojure.walk :as walk]
             [datascript.core :as d]
             [frontend.common.graph-view :as graph-view]
             [frontend.config :as config]
             [frontend.date :as date]
             [frontend.db.conn :as conn]
-            [frontend.db.file-based.model :as file-model]
             [frontend.db.react :as react]
             [frontend.db.utils :as db-utils]
             [frontend.state :as state]
diff --git a/src/main/frontend/worker/db_worker.cljs b/src/main/frontend/worker/db_worker.cljs
index 795703ad57..4218ef5fa3 100644
--- a/src/main/frontend/worker/db_worker.cljs
+++ b/src/main/frontend/worker/db_worker.cljs
@@ -40,11 +40,13 @@
             [logseq.common.util :as common-util]
             [logseq.db :as ldb]
             [logseq.db.common.entity-plus :as entity-plus]
+            [logseq.db.common.entity-util :as common-entity-util]
             [logseq.db.common.initial-data :as common-initial-data]
             [logseq.db.common.order :as db-order]
             [logseq.db.common.reference :as db-reference]
             [logseq.db.common.sqlite :as common-sqlite]
             [logseq.db.common.view :as db-view]
+            [logseq.db.frontend.class :as db-class]
             [logseq.db.frontend.schema :as db-schema]
             [logseq.db.sqlite.create-graph :as sqlite-create-graph]
             [logseq.db.sqlite.export :as sqlite-export]
@@ -700,6 +702,12 @@
   (let [db @(worker-state/get-datascript-conn repo)]
     (db-view/get-view-data db view-id option)))
 
+(def-thread-api :thread-api/get-class-objects
+  [repo class-id]
+  (let [db @(worker-state/get-datascript-conn repo)]
+    (->> (db-class/get-class-objects db class-id)
+         (map common-entity-util/entity->map))))
+
 (def-thread-api :thread-api/get-property-values
   [repo {:keys [property-ident] :as option}]
   (let [conn (worker-state/get-datascript-conn repo)]
diff --git a/src/main/logseq/api.cljs b/src/main/logseq/api.cljs
index 7f642a623e..c55b4214d1 100644
--- a/src/main/logseq/api.cljs
+++ b/src/main/logseq/api.cljs
@@ -870,136 +870,6 @@
             (editor-handler/expand-block! block-uuid))
           nil)))))
 
-;; properties (db only)
-(defn -get-property
-  [^js plugin k]
-  (when-let [k' (and (string? k) (api-block/sanitize-user-property-name k))]
-    (let [property-ident (api-block/get-db-ident-from-property-name k' plugin)]
-      (db-utils/pull property-ident))))
-
-(defn ^:export get_property
-  [k]
-  (this-as this
-           (p/let [prop (-get-property this k)]
-             (some-> prop
-                     (assoc :type (:logseq.property/type prop))
-                     (sdk-utils/normalize-keyword-for-json)
-                     (bean/->js)))))
-
-(defn ^:export upsert_property
-  "schema:
-    {:type :default | :number | :date | :datetime | :checkbox | :url | :node | :json | :string
-     :cardinality :many | :one
-     :hide? true
-     :view-context :page
-     :public? false}
-  "
-  [k ^js schema ^js opts]
-  (this-as this
-           (when-not (string/blank? k)
-             (p/let [opts (or (some-> opts bean/->clj) {})
-                     property-ident (api-block/get-db-ident-from-property-name k this)
-                     _ (api-block/ensure-property-upsert-control this property-ident k)
-                     schema (or (some-> schema (bean/->clj)
-                                        (update-keys #(if (contains? #{:hide :public} %)
-                                                        (keyword (str (name %) "?")) %))) {})
-                     schema (cond-> schema
-                              (string? (:cardinality schema))
-                              (-> (assoc :db/cardinality (keyword (:cardinality schema)))
-                                  (dissoc :cardinality))
-
-                              (string? (:type schema))
-                              (-> (assoc :logseq.property/type (keyword (:type schema)))
-                                  (dissoc :type)))
-                     p (db-property-handler/upsert-property! property-ident schema
-                                                             (assoc opts :property-name name))
-                     p (db-utils/pull (:db/id p))]
-               (bean/->js (sdk-utils/normalize-keyword-for-json p))))))
-
-(defn ^:export remove_property
-  [k]
-  (this-as
-   this
-   (p/let [property (-get-property this k)]
-     (db-api/remove-property property))))
-
-;; block properties
-(defn ^:export upsert_block_property
-  [block-uuid key ^js value ^js options]
-  (this-as
-   this
-   (p/let [keyname (api-block/sanitize-user-property-name key)
-           opts (bean/->clj options)
-           block-uuid (sdk-utils/uuid-or-throw-error block-uuid)
-           repo (state/get-current-repo)
-           block (<get-block block-uuid {:children? false})
-           db-based? (db-graph?)
-           key' (-> (if (keyword? keyname) (name keyname) keyname) (util/trim-safe))
-           value (bean/->clj value)]
-     (when block
-       (if db-based?
-         (db-api/upsert-block-property this block key' value (:schema opts))
-         (property-handler/set-block-property! repo block-uuid key' value))))))
-
-(defn ^:export remove_block_property
-  [block-uuid key]
-  (this-as this
-           (p/let [key (api-block/sanitize-user-property-name key)
-                   block-uuid (sdk-utils/uuid-or-throw-error block-uuid)
-                   _block (<get-block block-uuid {:children? false})
-                   db-based? (db-graph?)
-                   key-ns? (and (keyword? key) (namespace key))
-                   key (if key-ns? key (if (keyword? key) (name key) key))
-                   key (if (and db-based? (not key-ns?))
-                         (api-block/get-db-ident-from-property-name
-                          key (api-block/resolve-property-prefix-for-db this))
-                         key)]
-             (property-handler/remove-block-property!
-              (state/get-current-repo)
-              block-uuid key))))
-
-(defn ^:export get_block_property
-  [block-uuid key]
-  (this-as this
-           (p/let [block-uuid (sdk-utils/uuid-or-throw-error block-uuid)
-                   _block (<get-block block-uuid {:children? false})]
-             (when-let [properties (some-> block-uuid (db-model/get-block-by-uuid) (:block/properties))]
-               (when (seq properties)
-                 (let [key (api-block/sanitize-user-property-name key)
-                       property-name (if (keyword? key) (name key) key)
-                       ident (api-block/get-db-ident-from-property-name
-                              property-name (api-block/resolve-property-prefix-for-db this))
-                       property-value (or (get properties key)
-                                          (get properties (keyword property-name))
-                                          (get properties ident))
-                       property-value (if-let [property-id (:db/id property-value)]
-                                        (db/pull property-id) property-value)
-                       property-value (cond-> property-value
-                                        (map? property-value)
-                                        (assoc
-                                         :value (or (:logseq.property/value property-value)
-                                                    (:block/title property-value))
-                                         :ident ident))
-                       parsed-value (api-block/parse-property-json-value-if-need ident property-value)]
-                   (or parsed-value
-                       (bean/->js (sdk-utils/normalize-keyword-for-json property-value)))))))))
-
-(def ^:export get_block_properties
-  (fn [block-uuid]
-    (p/let [block-uuid (sdk-utils/uuid-or-throw-error block-uuid)
-            block (<get-block block-uuid {:children? false})]
-      (when block
-        (let [properties (if (db-graph?)
-                           (api-block/into-readable-db-properties (:block/properties block))
-                           (:block/properties block))]
-          (db-api/result->js properties))))))
-
-(defn ^:export get_page_properties
-  [id-or-page-name]
-  (p/let [page (<get-block id-or-page-name {:children? false})]
-    (when-let [id (:block/uuid page)]
-      (get_block_properties id))))
-
 (def ^:export get_current_page_blocks_tree
   (fn []
     (when-let [page (state/get-current-page)]
@@ -1188,6 +1058,141 @@
   []
   true)
 
+;; block properties
+(defn ^:export upsert_block_property
+  [block-uuid key ^js value ^js options]
+  (this-as
+   this
+   (p/let [keyname (api-block/sanitize-user-property-name key)
+           opts (bean/->clj options)
+           block-uuid (sdk-utils/uuid-or-throw-error block-uuid)
+           repo (state/get-current-repo)
+           block (<get-block block-uuid {:children? false})
+           db-based? (db-graph?)
+           key' (-> (if (keyword? keyname) (name keyname) keyname) (util/trim-safe))
+           value (bean/->clj value)]
+     (when block
+       (if db-based?
+         (db-api/upsert-block-property this block key' value (:schema opts))
+         (property-handler/set-block-property! repo block-uuid key' value))))))
+
+(defn ^:export remove_block_property
+  [block-uuid key]
+  (this-as this
+           (p/let [key (api-block/sanitize-user-property-name key)
+                   block-uuid (sdk-utils/uuid-or-throw-error block-uuid)
+                   _block (<get-block block-uuid {:children? false})
+                   db-based? (db-graph?)
+                   key-ns? (and (keyword? key) (namespace key))
+                   key (if key-ns? key (if (keyword? key) (name key) key))
+                   key (if (and db-based? (not key-ns?))
+                         (api-block/get-db-ident-from-property-name
+                          key (api-block/resolve-property-prefix-for-db this))
+                         key)]
+             (property-handler/remove-block-property!
+              (state/get-current-repo)
+              block-uuid key))))
+
+(defn ^:export get_block_property
+  [block-uuid key]
+  (this-as this
+           (p/let [block-uuid (sdk-utils/uuid-or-throw-error block-uuid)
+                   _block (<get-block block-uuid {:children? false})]
+             (when-let [properties (some-> block-uuid (db-model/get-block-by-uuid) (:block/properties))]
+               (when (seq properties)
+                 (let [key (api-block/sanitize-user-property-name key)
+                       property-name (if (keyword? key) (name key) key)
+                       ident (api-block/get-db-ident-from-property-name
+                              property-name (api-block/resolve-property-prefix-for-db this))
+                       property-value (or (get properties key)
+                                          (get properties (keyword property-name))
+                                          (get properties ident))
+                       property-value (if-let [property-id (:db/id property-value)]
+                                        (db/pull property-id) property-value)
+                       property-value (cond-> property-value
+                                        (map? property-value)
+                                        (assoc
+                                         :value (or (:logseq.property/value property-value)
+                                                    (:block/title property-value))
+                                         :ident ident))
+                       parsed-value (api-block/parse-property-json-value-if-need ident property-value)]
+                   (or parsed-value
+                       (bean/->js (sdk-utils/normalize-keyword-for-json property-value)))))))))
+
+(def ^:export get_block_properties
+  (fn [block-uuid]
+    (p/let [block-uuid (sdk-utils/uuid-or-throw-error block-uuid)
+            block (<get-block block-uuid {:children? false})]
+      (when block
+        (let [properties (if (db-graph?)
+                           (api-block/into-readable-db-properties (:block/properties block))
+                           (:block/properties block))]
+          (db-api/result->js properties))))))
+
+(defn ^:export get_page_properties
+  [id-or-page-name]
+  (p/let [page (<get-block id-or-page-name {:children? false})]
+    (when-let [id (:block/uuid page)]
+      (get_block_properties id))))
+
+;; db based graph APIs
+;; properties (db only)
+(defn -get-property
+  [^js plugin k]
+  (when-let [k' (and (string? k) (api-block/sanitize-user-property-name k))]
+    (let [property-ident (api-block/get-db-ident-from-property-name k' plugin)]
+      (db-utils/pull property-ident))))
+
+(defn ^:export get_property
+  [k]
+  (this-as this
+           (p/let [prop (-get-property this k)]
+             (some-> prop
+                     (assoc :type (:logseq.property/type prop))
+                     (sdk-utils/normalize-keyword-for-json)
+                     (bean/->js)))))
+
+(defn ^:export upsert_property
+  "schema:
+    {:type :default | :number | :date | :datetime | :checkbox | :url | :node | :json | :string
+     :cardinality :many | :one
+     :hide? true
+     :view-context :page
+     :public? false}
+  "
+  [k ^js schema ^js opts]
+  (this-as this
+           (when-not (string/blank? k)
+             (p/let [opts (or (some-> opts bean/->clj) {})
+                     property-ident (api-block/get-db-ident-from-property-name k this)
+                     _ (api-block/ensure-property-upsert-control this property-ident k)
+                     schema (or (some-> schema (bean/->clj)
+                                        (update-keys #(if (contains? #{:hide :public} %)
+                                                        (keyword (str (name %) "?")) %))) {})
+                     schema (cond-> schema
+                              (string? (:cardinality schema))
+                              (-> (assoc :db/cardinality (keyword (:cardinality schema)))
+                                  (dissoc :cardinality))
+
+                              (string? (:type schema))
+                              (-> (assoc :logseq.property/type (keyword (:type schema)))
+                                  (dissoc :type)))
+                     p (db-property-handler/upsert-property! property-ident schema
+                                                             (assoc opts :property-name name))
+                     p (db-utils/pull (:db/id p))]
+               (bean/->js (sdk-utils/normalize-keyword-for-json p))))))
+
+(defn ^:export remove_property
+  [k]
+  (this-as
+   this
+   (p/let [property (-get-property this k)]
+     (db-api/remove-property property))))
+
+(def ^:export get_all_tags db-api/get-all-tags)
+(def ^:export get-all-properties db-api/get-all-properties)
+(def ^:export get-tag-objects db-api/get-tag-objects)
+
 ;; file based graph APIs
 (def ^:export get_current_graph_templates file-api/get_current_graph_templates)
 (def ^:export get_template file-api/get_template)
diff --git a/src/main/logseq/api/block.cljs b/src/main/logseq/api/block.cljs
index c9052d5b07..f70aade179 100644
--- a/src/main/logseq/api/block.cljs
+++ b/src/main/logseq/api/block.cljs
@@ -2,7 +2,6 @@
   "Block related apis"
   (:require [cljs-bean.core :as bean]
             [clojure.string :as string]
-            [frontend.config :as config]
             [frontend.db :as db]
             [frontend.db.async :as db-async]
             [frontend.db.model :as db-model]
@@ -69,10 +68,6 @@
           (db-pu/readable-properties
            {:original-key? true :key-fn str})))
 
-(defn- entity->map
-  [e]
-  (assoc (into {} e) :db/id (:db/id e)))
-
 (defn parse-property-json-value-if-need
   [ident property-value]
   (when-let [prop (and (string? property-value)
diff --git a/src/main/logseq/api/db.cljs b/src/main/logseq/api/db.cljs
index 5abe60a70e..e93b07c177 100644
--- a/src/main/logseq/api/db.cljs
+++ b/src/main/logseq/api/db.cljs
@@ -5,6 +5,7 @@
             [clojure.walk :as walk]
             [datascript.core :as d]
             [frontend.db :as db]
+            [frontend.db.model :as db-model]
             [frontend.handler.common.page :as page-common-handler]
             [frontend.handler.editor :as editor-handler]
             [frontend.handler.page :as page-handler]
@@ -96,7 +97,24 @@
                         {key schema})}]
     (api-block/db-based-save-block-properties! block {key' value} opts)))
 
-;; TODO:
-;; get all tags
-;; get all properties
-;; get tag objects
+(defn get-all-tags
+  []
+  (-> (db-model/get-all-classes (state/get-current-repo)
+                                {:except-root-class? true})
+      result->js))
+
+(defn get-all-properties
+  []
+  (-> (ldb/get-all-properties (db/get-db))
+      result->js))
+
+(defn get-tag-objects
+  [class-uuid]
+  (let [id (sdk-utils/uuid-or-throw-error class-uuid)
+        class (db/entity [:block/uuid id])]
+    (if-not class
+      (throw (ex-info (str "Tag not exists with id: " class-uuid) {}))
+      (p/let [result (state/<invoke-db-worker :thread-api/get-class-objects
+                                              (state/get-current-repo)
+                                              (:db/id class))]
+        (result->js result)))))
diff --git a/src/main/logseq/sdk/utils.cljs b/src/main/logseq/sdk/utils.cljs
index 621ff630f2..f913794503 100644
--- a/src/main/logseq/sdk/utils.cljs
+++ b/src/main/logseq/sdk/utils.cljs
@@ -6,6 +6,7 @@
             [frontend.db :as db]
             [frontend.util :as util]
             [goog.object :as gobj]
+            [logseq.db.common.entity-util :as common-entity-util]
             [logseq.db.frontend.content :as db-content]))
 
 (defn- keep-json-keyword?
@@ -14,12 +15,6 @@
            (contains? #{"block" "db" "file"})
            (not)))
 
-(defn- entity->map
-  "Convert a db Entity to a map"
-  [e]
-  (assert (de/entity? e))
-  (assoc (into {} e) :db/id (:db/id e)))
-
 (defn remove-hidden-properties
   [m]
   (->> (remove (fn [[k _v]]
@@ -32,9 +27,9 @@
   ([input camel-case?]
    (when input
      (let [input (cond
-                   (de/entity? input) (entity->map input)
+                   (de/entity? input) (common-entity-util/entity->map input)
                    (sequential? input) (map #(if (de/entity? %)
-                                               (entity->map %)
+                                               (common-entity-util/entity->map %)
                                                %) input)
                    :else input)]
        (walk/prewalk