diff --git a/broker/broker.go b/broker/broker.go
index f95de4b4..11e029ed 100644
--- a/broker/broker.go
+++ b/broker/broker.go
@@ -10,7 +10,7 @@ import (
 )
 
 // DefaultBroker default memory broker
-var DefaultBroker = NewBroker()
+var DefaultBroker Broker = NewBroker()
 
 var (
 	// ErrNotConnected returns when broker used but not connected yet
diff --git a/config/config.go b/config/config.go
index ea00fd74..44c18f76 100644
--- a/config/config.go
+++ b/config/config.go
@@ -13,7 +13,7 @@ type Validator interface {
 }
 
 // DefaultConfig default config
-var DefaultConfig = NewConfig()
+var DefaultConfig Config = NewConfig()
 
 // DefaultWatcherMinInterval default min interval for poll changes
 var DefaultWatcherMinInterval = 5 * time.Second
diff --git a/logger/logger.go b/logger/logger.go
index 65bcdd16..71dcc2d2 100644
--- a/logger/logger.go
+++ b/logger/logger.go
@@ -3,7 +3,6 @@ package logger // import "go.unistack.org/micro/v3/logger"
 
 import (
 	"context"
-	"os"
 )
 
 type ContextAttrFunc func(ctx context.Context) []interface{}
@@ -12,7 +11,7 @@ var DefaultContextAttrFuncs []ContextAttrFunc
 
 var (
 	// DefaultLogger variable
-	DefaultLogger = NewLogger(WithLevel(ParseLevel(os.Getenv("MICRO_LOG_LEVEL"))))
+	DefaultLogger Logger = NewLogger()
 	// DefaultLevel used by logger
 	DefaultLevel = InfoLevel
 	// DefaultCallerSkipCount used by logger
diff --git a/meter/meter.go b/meter/meter.go
index 71da6914..887b8236 100644
--- a/meter/meter.go
+++ b/meter/meter.go
@@ -1,5 +1,5 @@
 // Package meter is for instrumentation
-package meter // import "go.unistack.org/micro/v3/meter"
+package meter
 
 import (
 	"io"
@@ -11,7 +11,7 @@ import (
 
 var (
 	// DefaultMeter is the default meter
-	DefaultMeter = NewMeter()
+	DefaultMeter Meter = NewMeter()
 	// DefaultAddress data will be made available on this host:port
 	DefaultAddress = ":9090"
 	// DefaultPath the meter endpoint where the Meter data will be made available
diff --git a/register/register.go b/register/register.go
index 30055da1..bfe0078a 100644
--- a/register/register.go
+++ b/register/register.go
@@ -18,7 +18,7 @@ var DefaultDomain = "micro"
 
 var (
 	// DefaultRegister is the global default register
-	DefaultRegister = NewRegister()
+	DefaultRegister Register = NewRegister()
 	// ErrNotFound returned when LookupService is called and no services found
 	ErrNotFound = errors.New("service not found")
 	// ErrWatcherStopped returned when when watcher is stopped
diff --git a/resolver/resolver.go b/resolver/resolver.go
index 7ba1f6cf..1e3e91e6 100644
--- a/resolver/resolver.go
+++ b/resolver/resolver.go
@@ -1,5 +1,5 @@
 // Package resolver resolves network names to addresses
-package resolver // import "go.unistack.org/micro/v3/resolver"
+package resolver
 
 // Resolver is network resolver. It's used to find network nodes
 // via the name to connect to. This is done based on Network.Name().
diff --git a/router/router.go b/router/router.go
index 2509b7c5..43874196 100644
--- a/router/router.go
+++ b/router/router.go
@@ -7,7 +7,7 @@ import (
 
 var (
 	// DefaultRouter is the global default router
-	DefaultRouter = NewRouter()
+	DefaultRouter Router = NewRouter()
 	// DefaultNetwork is default micro network
 	DefaultNetwork = "micro"
 	// ErrRouteNotFound is returned when no route was found in the routing table
diff --git a/server/server.go b/server/server.go
index e38d06e8..f6ea3956 100644
--- a/server/server.go
+++ b/server/server.go
@@ -11,7 +11,7 @@ import (
 )
 
 // DefaultServer default server
-var DefaultServer = NewServer()
+var DefaultServer Server = NewServer()
 
 var (
 	// DefaultAddress will be used if no address passed, use secure localhost
diff --git a/store/store.go b/store/store.go
index 251c2ba0..896c1350 100644
--- a/store/store.go
+++ b/store/store.go
@@ -12,7 +12,7 @@ var (
 	// ErrInvalidKey is returned when a key has empty or have invalid format
 	ErrInvalidKey = errors.New("invalid key")
 	// DefaultStore is the global default store
-	DefaultStore = NewStore()
+	DefaultStore Store = NewStore()
 	// DefaultSeparator is the gloabal default key parts separator
 	DefaultSeparator = "/"
 )
diff --git a/tracer/tracer.go b/tracer/tracer.go
index 46c72c41..53f42f13 100644
--- a/tracer/tracer.go
+++ b/tracer/tracer.go
@@ -10,7 +10,7 @@ import (
 )
 
 // DefaultTracer is the global default tracer
-var DefaultTracer = NewTracer()
+var DefaultTracer Tracer = NewTracer()
 
 var (
 	// TraceIDKey is the key used for the trace id in the log call