diff --git a/database/json_file_storage_test.go b/database/json_file_storage_test.go
new file mode 100644
index 00000000..bd562c80
--- /dev/null
+++ b/database/json_file_storage_test.go
@@ -0,0 +1,75 @@
+package database
+
+import (
+	"fmt"
+	"math/big"
+	"os"
+	"strconv"
+	"sync"
+	"testing"
+
+	"github.com/ava-labs/avalanchego/ids"
+	"github.com/ava-labs/avalanchego/utils/logging"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestConcurrentWriteRead(t *testing.T) {
+	networks := []ids.ID{
+		ids.GenerateTestID(),
+		ids.GenerateTestID(),
+		ids.GenerateTestID(),
+	}
+	jsonStorage := setupJsonStorage(t, networks)
+
+	// Test writing to the JSON database concurrently.
+	wg := sync.WaitGroup{}
+	for i := 0; i < 3; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			testWrite(jsonStorage, networks[0], uint64(0))
+			testWrite(jsonStorage, networks[1], uint64(1))
+			testWrite(jsonStorage, networks[2], uint64(2))
+		}()
+	}
+	wg.Wait()
+
+	for i, id := range networks {
+		latestSeenBlockData, err := jsonStorage.Get(id, []byte(LatestSeenBlockKey))
+		if err != nil {
+			t.Fatal(fmt.Sprintf("failed to retrieve from JSON storage. networkID: %d err: %v", i, err))
+		}
+		latestSeenBlock, success := new(big.Int).SetString(string(latestSeenBlockData), 10)
+		if !success {
+			t.Fatal(fmt.Sprintf("failed to convert latest block to big.Int. err: %v", err))
+		}
+		assert.Equal(t, uint64(i), latestSeenBlock.Uint64(), fmt.Sprintf("latest seen block height is not correct. networkID: %d", i))
+	}
+}
+
+func setupJsonStorage(t *testing.T, networks []ids.ID) *JSONFileStorage {
+	logger := logging.NewLogger(
+		"awm-relayer-test",
+		logging.NewWrappedCore(
+			logging.Info,
+			os.Stdout,
+			logging.JSON.ConsoleEncoder(),
+		),
+	)
+	storageDir := t.TempDir()
+
+	jsonStorage, err := NewJSONFileStorage(logger, storageDir, networks)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return jsonStorage
+}
+
+func testWrite(storage *JSONFileStorage, chainID ids.ID, height uint64) {
+	fmt.Println(chainID, height)
+	err := storage.Put(chainID, []byte(LatestSeenBlockKey), []byte(strconv.FormatUint(height, 10)))
+	if err != nil {
+		fmt.Printf("failed to put data: %v", err)
+		return
+	}
+}