diff --git a/contrib/launchtools/config.go b/contrib/launchtools/config.go
index 660fca5..5586b8f 100644
--- a/contrib/launchtools/config.go
+++ b/contrib/launchtools/config.go
@@ -116,7 +116,7 @@ type OpBridge struct {
 	OutputSubmissionStartHeight uint64         `json:"output_submission_start_height,omitempty"`
 
 	// batch submission setup
-	BatchSubmitTarget ophosttypes.BatchInfo_ChainType `json:"batch_submission_target"`
+	BatchSubmissionTarget ophosttypes.BatchInfo_ChainType `json:"batch_submission_target"`
 }
 
 func (opBridge *OpBridge) Finalize() error {
@@ -124,8 +124,8 @@ func (opBridge *OpBridge) Finalize() error {
 		opBridge.OutputSubmissionStartHeight = 1
 	}
 
-	if opBridge.BatchSubmitTarget == ophosttypes.BatchInfo_CHAIN_TYPE_UNSPECIFIED {
-		opBridge.BatchSubmitTarget = ophosttypes.BatchInfo_CHAIN_TYPE_INITIA
+	if opBridge.BatchSubmissionTarget == ophosttypes.BatchInfo_CHAIN_TYPE_UNSPECIFIED {
+		opBridge.BatchSubmissionTarget = ophosttypes.BatchInfo_CHAIN_TYPE_INITIA
 	}
 
 	if opBridge.OutputSubmissionInterval == nil {
@@ -141,6 +141,64 @@ func (opBridge *OpBridge) Finalize() error {
 	return nil
 }
 
+func (opBridge *OpBridge) UnmarshalJSON(data []byte) error {
+	var tmp struct {
+		OutputSubmissionInterval    string                          `json:"output_submission_interval,omitempty"`
+		OutputFinalizationPeriod    string                          `json:"output_finalization_period,omitempty"`
+		OutputSubmissionStartHeight uint64                          `json:"output_submission_start_height,omitempty"`
+		BatchSubmissionTarget       ophosttypes.BatchInfo_ChainType `json:"batch_submission_target,omitempty"`
+	}
+
+	if err := json.Unmarshal(data, &tmp); err != nil {
+		return err
+	}
+
+	if tmp.OutputSubmissionInterval != "" {
+		d, err := time.ParseDuration(tmp.OutputSubmissionInterval)
+		if err != nil {
+			return err
+		}
+
+		opBridge.OutputSubmissionInterval = &d
+	}
+
+	if tmp.OutputFinalizationPeriod != "" {
+		d, err := time.ParseDuration(tmp.OutputFinalizationPeriod)
+		if err != nil {
+			return err
+		}
+
+		opBridge.OutputFinalizationPeriod = &d
+	}
+
+	opBridge.OutputSubmissionStartHeight = tmp.OutputSubmissionStartHeight
+	opBridge.BatchSubmissionTarget = tmp.BatchSubmissionTarget
+
+	return nil
+}
+
+func (opBridge OpBridge) MarshalJSON() ([]byte, error) {
+	tmp := struct {
+		OutputSubmissionInterval    string                          `json:"output_submission_interval,omitempty"`
+		OutputFinalizationPeriod    string                          `json:"output_finalization_period,omitempty"`
+		OutputSubmissionStartHeight uint64                          `json:"output_submission_start_height,omitempty"`
+		BatchSubmissionTarget       ophosttypes.BatchInfo_ChainType `json:"batch_submission_target,omitempty"`
+	}{
+		OutputSubmissionStartHeight: opBridge.OutputSubmissionStartHeight,
+		BatchSubmissionTarget:       opBridge.BatchSubmissionTarget,
+	}
+
+	if opBridge.OutputSubmissionInterval != nil {
+		tmp.OutputSubmissionInterval = opBridge.OutputSubmissionInterval.String()
+	}
+
+	if opBridge.OutputFinalizationPeriod != nil {
+		tmp.OutputFinalizationPeriod = opBridge.OutputFinalizationPeriod.String()
+	}
+
+	return json.Marshal(tmp)
+}
+
 type L1Config struct {
 	ChainID   string `json:"chain_id,omitempty"`
 	RPC_URL   string `json:"rpc_url,omitempty"`
diff --git a/contrib/launchtools/config_test.go b/contrib/launchtools/config_test.go
new file mode 100644
index 0000000..27a8e21
--- /dev/null
+++ b/contrib/launchtools/config_test.go
@@ -0,0 +1,31 @@
+package launchtools
+
+import (
+	"encoding/json"
+	"testing"
+	"time"
+
+	ophosttypes "github.com/initia-labs/OPinit/x/ophost/types"
+	"github.com/stretchr/testify/require"
+)
+
+func Test_opBridgeConfig_JSON(t *testing.T) {
+	submissionInterval := time.Second
+	finalizationPeriod := time.Second * 10
+
+	opBridgeConfig := &OpBridge{
+		OutputSubmissionInterval:    &submissionInterval,
+		OutputFinalizationPeriod:    &finalizationPeriod,
+		OutputSubmissionStartHeight: 1,
+		BatchSubmissionTarget:       ophosttypes.BatchInfo_CHAIN_TYPE_CELESTIA,
+	}
+
+	bz, err := json.Marshal(opBridgeConfig)
+	require.NoError(t, err)
+	require.Equal(t, `{"output_submission_interval":"1s","output_finalization_period":"10s","output_submission_start_height":1,"batch_submission_target":"CELESTIA"}`, string(bz))
+
+	var opBridgeConfig2 OpBridge
+	err = json.Unmarshal(bz, &opBridgeConfig2)
+	require.NoError(t, err)
+	require.Equal(t, opBridgeConfig, &opBridgeConfig2)
+}
diff --git a/contrib/launchtools/steps/opbridge.go b/contrib/launchtools/steps/opbridge.go
index 30ca1d3..5e2a2d1 100644
--- a/contrib/launchtools/steps/opbridge.go
+++ b/contrib/launchtools/steps/opbridge.go
@@ -45,7 +45,7 @@ func InitializeOpBridge(
 			config.SystemKeys.Challenger.L1Address,
 			config.SystemKeys.OutputSubmitter.L1Address,
 			config.SystemKeys.BatchSubmitter.L1Address,
-			config.OpBridge.BatchSubmitTarget,
+			config.OpBridge.BatchSubmissionTarget,
 			*config.OpBridge.OutputSubmissionInterval,
 			*config.OpBridge.OutputFinalizationPeriod,
 			config.OpBridge.OutputSubmissionStartHeight,