diff --git a/batch.go b/batch.go
index 1859261..5aa9772 100644
--- a/batch.go
+++ b/batch.go
@@ -345,6 +345,7 @@ func (c *Client) FetchBatch(keys []string, expire time.Duration, fn func(idxs []
 
 // FetchBatch2 is same with FetchBatch, except that a user defined context.Context can be provided.
 func (c *Client) FetchBatch2(ctx context.Context, keys []string, expire time.Duration, fn func(idxs []int) (map[int]string, error)) (map[int]string, error) {
+	keys = c.formatKeys(keys)
 	if c.Options.DisableCacheRead {
 		return fn(c.keysIdx(keys))
 	} else if c.Options.StrongConsistency {
@@ -360,6 +361,7 @@ func (c *Client) TagAsDeletedBatch(keys []string) error {
 
 // TagAsDeletedBatch2 a key list, the keys in list will expire after delay time.
 func (c *Client) TagAsDeletedBatch2(ctx context.Context, keys []string) error {
+	keys = c.formatKeys(keys)
 	if c.Options.DisableCacheDelete {
 		return nil
 	}
@@ -385,3 +387,12 @@ func (c *Client) TagAsDeletedBatch2(ctx context.Context, keys []string) error {
 	}
 	return luaFn(c.rdb)
 }
+
+// formatKeys returns formatted keys
+func (c *Client) formatKeys(keys []string) []string {
+	formattedKeys := make([]string, len(keys))
+	for i, k := range keys {
+		formattedKeys[i] = c.formatKey(k)
+	}
+	return formattedKeys
+}
diff --git a/client.go b/client.go
index 07398b4..c7aac60 100644
--- a/client.go
+++ b/client.go
@@ -3,8 +3,10 @@ package rockscache
 import (
 	"context"
 	"fmt"
+	"github.com/jinzhu/copier"
 	"math"
 	"math/rand"
+	"reflect"
 	"time"
 
 	"github.com/lithammer/shortuuid"
@@ -46,6 +48,10 @@ type Options struct {
 	StrongConsistency bool
 	// Context for redis command
 	Context context.Context
+	// Prefix for redis key
+	Prefix string
+	// codec
+	Codec Codec
 }
 
 // NewDefaultOptions return default options
@@ -58,6 +64,7 @@ func NewDefaultOptions() Options {
 		RandomExpireAdjustment: 0.1,
 		WaitReplicasTimeout:    3000 * time.Millisecond,
 		Context:                context.Background(),
+		Codec:                  &codec{},
 	}
 }
 
@@ -92,6 +99,7 @@ func (c *Client) TagAsDeleted2(ctx context.Context, key string) error {
 	if c.Options.DisableCacheDelete {
 		return nil
 	}
+	key = c.formatKey(key)
 	debugf("deleting: key=%s", key)
 	luaFn := func(con redis.Scripter) error {
 		_, err := callLua(ctx, con, deleteScript, []string{key}, []interface{}{int64(c.Options.Delay / time.Second)})
@@ -124,6 +132,7 @@ func (c *Client) Fetch(key string, expire time.Duration, fn func() (string, erro
 // Fetch2 returns the value store in cache indexed by the key.
 // If the key doest not exists, call fn to get result, store it in cache, then return.
 func (c *Client) Fetch2(ctx context.Context, key string, expire time.Duration, fn func() (string, error)) (string, error) {
+	key = c.formatKey(key)
 	ex := expire - c.Options.Delay - time.Duration(rand.Float64()*c.Options.RandomExpireAdjustment*float64(expire))
 	v, err, _ := c.group.Do(key, func() (interface{}, error) {
 		if c.Options.DisableCacheRead {
@@ -221,11 +230,12 @@ func (c *Client) strongFetch(ctx context.Context, key string, expire time.Durati
 
 // RawGet returns the value store in cache indexed by the key, no matter if the key locked or not
 func (c *Client) RawGet(ctx context.Context, key string) (string, error) {
-	return c.rdb.HGet(ctx, key, "value").Result()
+	return c.rdb.HGet(ctx, c.formatKey(key), "value").Result()
 }
 
 // RawSet sets the value store in cache indexed by the key, no matter if the key locked or not
 func (c *Client) RawSet(ctx context.Context, key string, value string, expire time.Duration) error {
+	key = c.formatKey(key)
 	err := c.rdb.HSet(ctx, key, "value", value).Err()
 	if err == nil {
 		err = c.rdb.Expire(ctx, key, expire).Err()
@@ -248,3 +258,52 @@ func (c *Client) UnlockForUpdate(ctx context.Context, key string, owner string)
 	_, err := callLua(ctx, c.rdb, unlockScript, []string{key}, []interface{}{owner, c.Options.LockExpire / time.Second})
 	return err
 }
+
+// formatKey returns the key with prefix
+func (c *Client) formatKey(key string) string {
+	return c.Options.Prefix + key
+}
+
+// FetchWithCodec fetches the value from cache and encode the result using codec
+func (c *Client) FetchWithCodec(ctx context.Context, key string, expire time.Duration, res any, fn func() (any, error)) error {
+	expirationAdjustment := time.Duration(rand.Float64() * c.Options.RandomExpireAdjustment * float64(expire))
+	ex := expire - c.Options.Delay - expirationAdjustment
+
+	fetch, err, _ := c.group.Do(key, func() (any, error) {
+		if c.Options.DisableCacheRead {
+			return fn()
+		}
+
+		fetchFunc := func() (string, error) {
+			val, err := fn()
+			if err != nil {
+				return "", err
+			}
+			bs, err := c.Options.Codec.Encode(val)
+			if err != nil {
+				return "", err
+			}
+			return string(bs), nil
+		}
+
+		if c.Options.StrongConsistency {
+			return c.strongFetch(ctx, key, ex, fetchFunc)
+		}
+		return c.weakFetch(ctx, key, ex, fetchFunc)
+	})
+
+	if err != nil {
+		return err
+	}
+
+	if reflect.TypeOf(res) == reflect.TypeOf(fetch) {
+		return copier.CopyWithOption(res, fetch, copier.Option{DeepCopy: true})
+	}
+
+	switch val := res.(type) {
+	case string:
+		return c.Options.Codec.Decode([]byte(val), res)
+	default:
+		return fmt.Errorf("invalid type returned from cache fetch: %T", res)
+	}
+}
diff --git a/codec.go b/codec.go
new file mode 100644
index 0000000..4ca3a0b
--- /dev/null
+++ b/codec.go
@@ -0,0 +1,32 @@
+package rockscache
+
+import (
+	jsoniter "github.com/json-iterator/go"
+)
+
+type (
+	// Codec interface
+	Codec interface {
+		// Encode encodes the provided value into a byte slice.
+		Encode(interface{}) ([]byte, error)
+
+		// Decode decodes the provided byte slice into a value.
+		Decode([]byte, interface{}) error
+	}
+
+	// default codec
+	codec struct {
+	}
+)
+
+var _ Codec = (*codec)(nil)
+
+// Encode encodes the given value into a JSON byte array.
+func (c *codec) Encode(v any) ([]byte, error) {
+	return jsoniter.Marshal(v)
+}
+
+// Decode decodes binary data into a value pointed to by v using JSON encoding.
+func (c *codec) Decode(data []byte, v any) error {
+	return jsoniter.Unmarshal(data, v)
+}
diff --git a/go.mod b/go.mod
index 22b27ff..d8017d2 100644
--- a/go.mod
+++ b/go.mod
@@ -3,6 +3,8 @@ module github.com/dtm-labs/rockscache
 go 1.18
 
 require (
+	github.com/jinzhu/copier v0.4.0
+	github.com/json-iterator/go v1.1.12
 	github.com/lithammer/shortuuid v3.0.0+incompatible
 	github.com/redis/go-redis/v9 v9.0.3
 	github.com/stretchr/testify v1.8.4
@@ -14,6 +16,8 @@ require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
 	github.com/google/uuid v1.3.0 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421 // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/go.sum b/go.sum
index 13549d4..7078597 100644
--- a/go.sum
+++ b/go.sum
@@ -7,27 +7,30 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
+github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/jinzhu/copier v0.4.0 h1:w3ciUoD19shMCRargcpm0cm91ytaBhDvuRpz1ODO/U8=
+github.com/jinzhu/copier v0.4.0/go.mod h1:DfbEm0FYsaqBcKcFuvmOZb218JkPGtvSHsKg8S8hyyg=
+github.com/json-iterator/go v1.1.12 h1:PV8peI4a0ysnczrg+LtxykD8LfKY9ML6u2jnxaEnrnM=
+github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHmT4TnhNGBo=
 github.com/lithammer/shortuuid v3.0.0+incompatible h1:NcD0xWW/MZYXEHa6ITy6kaXN5nwm/V115vj2YXfhS0w=
 github.com/lithammer/shortuuid v3.0.0+incompatible/go.mod h1:FR74pbAuElzOUuenUHTK2Tciko1/vKuIKS9dSkDrA4w=
+github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421 h1:ZqeYNhU3OHLH3mGKHDcjJRFFRrJa6eAM5H+CtDdOsPc=
+github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
+github.com/modern-go/reflect2 v1.0.2 h1:xBagoLtFs94CBntxluKeaWgTMpvLxC4ur3nMaC9Gz0M=
+github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjYzDa0/r8luk=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/redis/go-redis/v9 v9.0.3 h1:+7mmR26M0IvyLxGZUHxu4GiBkJkVDid0Un+j4ScYu4k=
 github.com/redis/go-redis/v9 v9.0.3/go.mod h1:WqMKv5vnQbRuZstUwxQI195wHy+t4PuXDOjzMvcuQHk=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
-github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
-github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
-github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
-github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
 golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=