diff --git a/lib/MySQL/translator.js b/lib/MySQL/translator.js
index b67361f..18acdf0 100644
--- a/lib/MySQL/translator.js
+++ b/lib/MySQL/translator.js
@@ -402,15 +402,27 @@ class MySqlTranslator extends sqlTranslator_1.SqlTranslator {
                     else if (attr2 === '$length') {
                         // json length
                         const length = o[attr2];
-                        (0, assert_1.default)(typeof length == 'number');
                         if (stmt2) {
                             stmt2 += ' and ';
                         }
-                        if (p) {
-                            stmt2 += `(JSON_LENGTH(${alias}.${attr}->>"$${p}") = ${length})`;
+                        if (typeof length === 'number') {
+                            if (p) {
+                                stmt2 += `(JSON_LENGTH(${alias}.${attr}->>"$${p}") = ${length})`;
+                            }
+                            else {
+                                stmt2 += `(JSON_LENGTH(${alias}.${attr}) = ${length})`;
+                            }
                         }
                         else {
-                            stmt2 += `(JSON_LENGTH(${alias}.${attr})= ${length})`;
+                            (0, assert_1.default)(typeof length === 'object');
+                            const op = Object.keys(length)[0];
+                            (0, assert_1.default)(op.startsWith('$'));
+                            if (p) {
+                                stmt2 += `(JSON_LENGTH(${alias}.${attr}->>"$${p}") ${this.translatePredicate(op, length[op])})`;
+                            }
+                            else {
+                                stmt2 += `(JSON_LENGTH(${alias}.${attr}) ${this.translatePredicate(op, length[op])})`;
+                            }
                         }
                     }
                     else if (attr2.startsWith('$')) {
diff --git a/src/MySQL/translator.ts b/src/MySQL/translator.ts
index cb9a38d..f830af3 100644
--- a/src/MySQL/translator.ts
+++ b/src/MySQL/translator.ts
@@ -437,7 +437,7 @@ export class MySqlTranslator<ED extends EntityDict & BaseEntityDict> extends Sql
                             stmt2 += `(JSON_CONTAINS(${alias}.${attr}->>"$${p}", CAST('${value}' AS JSON)))`;
                         }
                         else {
-                            stmt2 += `(JSON_CONTAINS(${alias}.${attr}, CAST('${value}' AS JSON)))`;                            
+                            stmt2 += `(JSON_CONTAINS(${alias}.${attr}, CAST('${value}' AS JSON)))`;
                         }
                     }
                     else if (attr2 === '$overlaps') {
@@ -450,21 +450,33 @@ export class MySqlTranslator<ED extends EntityDict & BaseEntityDict> extends Sql
                             stmt2 += `(JSON_OVERLAPS(${alias}.${attr}->>"$${p}", CAST('${value}' AS JSON)))`;
                         }
                         else {
-                            stmt2 += `(JSON_OVERLAPS(${alias}.${attr}, CAST('${value}' AS JSON)))`;                            
+                            stmt2 += `(JSON_OVERLAPS(${alias}.${attr}, CAST('${value}' AS JSON)))`;
                         }
                     }
                     else if (attr2 === '$length') {
                         // json length
                         const length = o[attr2];
-                        assert (typeof length == 'number');
                         if (stmt2) {
                             stmt2 += ' and ';
                         }
-                        if (p) {
-                            stmt2 += `(JSON_LENGTH(${alias}.${attr}->>"$${p}") = ${length})`;
+                        if (typeof length === 'number') {
+                            if (p) {
+                                stmt2 += `(JSON_LENGTH(${alias}.${attr}->>"$${p}") = ${length})`;
+                            }
+                            else {
+                                stmt2 += `(JSON_LENGTH(${alias}.${attr}) = ${length})`;
+                            }
                         }
                         else {
-                            stmt2 += `(JSON_LENGTH(${alias}.${attr})= ${length})`;                            
+                            assert (typeof length === 'object');
+                            const op = Object.keys(length)[0];
+                            assert(op.startsWith('$'));
+                            if (p) {
+                                stmt2 += `(JSON_LENGTH(${alias}.${attr}->>"$${p}") ${this.translatePredicate(op, length[op])})`;
+                            }
+                            else {
+                                stmt2 += `(JSON_LENGTH(${alias}.${attr}) ${this.translatePredicate(op, length[op])})`;
+                            }
                         }
                     }
                     else if (attr2.startsWith('$')) {
diff --git a/test/testMySQLStore.ts b/test/testMySQLStore.ts
index c5c8dff..e76e705 100644
--- a/test/testMySQLStore.ts
+++ b/test/testMySQLStore.ts
@@ -1887,6 +1887,25 @@ describe('test mysqlstore', function () {
                 }
             }
         }, context, {});
+        
+        const row10 = await store.select('oper', {
+            data: {
+                id: 1,
+                data: {
+                    name: 1,
+                    price: 1,
+                },
+            },
+            filter: {
+                data: {
+                    price: {
+                        $length: {
+                            $gt: 3,
+                        },
+                    },
+                }
+            }
+        }, context, {});
 
         await context.commit();
         assert(row.length === 1);
@@ -1898,6 +1917,7 @@ describe('test mysqlstore', function () {
         assert(row7.length === 1);
         assert(row8.length === 1);
         assert(row9.length === 1);
+        assert(row10.length === 0);
         // console.log(JSON.stringify(row7));
     });