diff --git a/CHANGELOG.md b/CHANGELOG.md
index 057e5a39..6a5e9886 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -66,4 +66,5 @@
 
 ## Fix lint and format code
 
+- [4651](https://github.com/beego/beego/pull/4651)
 - [4644](https://github.com/beego/beego/pull/4644)
diff --git a/client/cache/conv_test.go b/client/cache/conv_test.go
index 523150d1..c261c440 100644
--- a/client/cache/conv_test.go
+++ b/client/cache/conv_test.go
@@ -21,29 +21,29 @@ import (
 )
 
 func TestGetString(t *testing.T) {
-	var t1 = "test1"
+	t1 := "test1"
 
 	assert.Equal(t, "test1", GetString(t1))
-	var t2 = []byte("test2")
+	t2 := []byte("test2")
 	assert.Equal(t, "test2", GetString(t2))
-	var t3 = 1
+	t3 := 1
 	assert.Equal(t, "1", GetString(t3))
 	var t4 int64 = 1
 	assert.Equal(t, "1", GetString(t4))
-	var t5 = 1.1
+	t5 := 1.1
 	assert.Equal(t, "1.1", GetString(t5))
 	assert.Equal(t, "", GetString(nil))
 }
 
 func TestGetInt(t *testing.T) {
-	var t1 = 1
+	t1 := 1
 	assert.Equal(t, 1, GetInt(t1))
 	var t2 int32 = 32
 	assert.Equal(t, 32, GetInt(t2))
 
 	var t3 int64 = 64
 	assert.Equal(t, 64, GetInt(t3))
-	var t4 = "128"
+	t4 := "128"
 
 	assert.Equal(t, 128, GetInt(t4))
 	assert.Equal(t, 0, GetInt(nil))
@@ -51,38 +51,38 @@ func TestGetInt(t *testing.T) {
 
 func TestGetInt64(t *testing.T) {
 	var i int64 = 1
-	var t1 = 1
+	t1 := 1
 	assert.Equal(t, i, GetInt64(t1))
 	var t2 int32 = 1
 
 	assert.Equal(t, i, GetInt64(t2))
 	var t3 int64 = 1
 	assert.Equal(t, i, GetInt64(t3))
-	var t4 = "1"
+	t4 := "1"
 	assert.Equal(t, i, GetInt64(t4))
 	assert.Equal(t, int64(0), GetInt64(nil))
 }
 
 func TestGetFloat64(t *testing.T) {
-	var f = 1.11
+	f := 1.11
 	var t1 float32 = 1.11
 	assert.Equal(t, f, GetFloat64(t1))
-	var t2 = 1.11
+	t2 := 1.11
 	assert.Equal(t, f, GetFloat64(t2))
-	var t3 = "1.11"
+	t3 := "1.11"
 	assert.Equal(t, f, GetFloat64(t3))
 
 	var f2 float64 = 1
-	var t4 = 1
+	t4 := 1
 	assert.Equal(t, f2, GetFloat64(t4))
 
 	assert.Equal(t, float64(0), GetFloat64(nil))
 }
 
 func TestGetBool(t *testing.T) {
-	var t1 = true
+	t1 := true
 	assert.True(t, GetBool(t1))
-	var t2 = "true"
+	t2 := "true"
 	assert.True(t, GetBool(t2))
 
 	assert.False(t, GetBool(nil))
diff --git a/client/cache/error_code.go b/client/cache/error_code.go
index 3981af43..5611f065 100644
--- a/client/cache/error_code.go
+++ b/client/cache/error_code.go
@@ -170,5 +170,7 @@ The reponse from SSDB server is invalid.
 Usually it indicates something wrong on server side.
 `)
 
-var ErrKeyExpired = berror.Error(KeyExpired, "the key is expired")
-var ErrKeyNotExist = berror.Error(KeyNotExist, "the key isn't exist")
+var (
+	ErrKeyExpired  = berror.Error(KeyExpired, "the key is expired")
+	ErrKeyNotExist = berror.Error(KeyNotExist, "the key isn't exist")
+)
diff --git a/client/cache/file.go b/client/cache/file.go
index 1f2e64d6..ae2bc7cf 100644
--- a/client/cache/file.go
+++ b/client/cache/file.go
@@ -67,7 +67,6 @@ func NewFileCache() Cache {
 // StartAndGC starts gc for file cache.
 // config must be in the format {CachePath:"/cache","FileSuffix":".bin","DirectoryLevel":"2","EmbedExpiry":"0"}
 func (fc *FileCache) StartAndGC(config string) error {
-
 	cfg := make(map[string]string)
 	err := json.Unmarshal([]byte(config), &cfg)
 	if err != nil {
diff --git a/client/cache/memory.go b/client/cache/memory.go
index f294595d..c1d1a2e5 100644
--- a/client/cache/memory.go
+++ b/client/cache/memory.go
@@ -25,10 +25,8 @@ import (
 	"github.com/beego/beego/v2/core/berror"
 )
 
-var (
-	// Timer for how often to recycle the expired cache items in memory (in seconds)
-	DefaultEvery = 60 // 1 minute
-)
+// DefaultEvery sets a timer for how often to recycle the expired cache items in memory (in seconds)
+var DefaultEvery = 60 // 1 minute
 
 // MemoryItem stores memory cache item.
 type MemoryItem struct {
diff --git a/client/cache/redis/redis.go b/client/cache/redis/redis.go
index 7e70af2e..bd244223 100644
--- a/client/cache/redis/redis.go
+++ b/client/cache/redis/redis.go
@@ -43,10 +43,8 @@ import (
 	"github.com/beego/beego/v2/core/berror"
 )
 
-var (
-	// The collection name of redis for the cache adapter.
-	DefaultKey = "beecacheRedis"
-)
+// DefaultKey defines the collection name of redis for the cache adapter.
+var DefaultKey = "beecacheRedis"
 
 // Cache is Redis cache adapter.
 type Cache struct {
diff --git a/client/cache/redis/redis_test.go b/client/cache/redis/redis_test.go
index 89ee9243..305e5423 100644
--- a/client/cache/redis/redis_test.go
+++ b/client/cache/redis/redis_test.go
@@ -28,7 +28,6 @@ import (
 )
 
 func TestRedisCache(t *testing.T) {
-
 	redisAddr := os.Getenv("REDIS_ADDR")
 	if redisAddr == "" {
 		redisAddr = "127.0.0.1:6379"
diff --git a/client/cache/ssdb/ssdb.go b/client/cache/ssdb/ssdb.go
index e715d07f..54558ea3 100644
--- a/client/cache/ssdb/ssdb.go
+++ b/client/cache/ssdb/ssdb.go
@@ -124,7 +124,6 @@ func (rc *Cache) IsExist(ctx context.Context, key string) (bool, error) {
 		return true, nil
 	}
 	return false, nil
-
 }
 
 // ClearAll clears all cached items in ssdb.
diff --git a/client/cache/ssdb/ssdb_test.go b/client/cache/ssdb/ssdb_test.go
index 41271e9b..0a38b2de 100644
--- a/client/cache/ssdb/ssdb_test.go
+++ b/client/cache/ssdb/ssdb_test.go
@@ -15,7 +15,6 @@ import (
 )
 
 func TestSsdbcacheCache(t *testing.T) {
-
 	ssdbAddr := os.Getenv("SSDB_ADDR")
 	if ssdbAddr == "" {
 		ssdbAddr = "127.0.0.1:8888"