diff --git a/cpu.go b/cpu.go
index c6703e7..6b49e99 100644
--- a/cpu.go
+++ b/cpu.go
@@ -23,16 +23,16 @@ type CPUTimesStat struct {
 
 type CPUInfoStat struct {
 	CPU        int32    `json:"cpu"`
-	VendorID   string   `json:"vendorId"`
+	VendorID   string   `json:"vendor_id"`
 	Family     string   `json:"family"`
 	Model      string   `json:"model"`
 	Stepping   int32    `json:"stepping"`
-	PhysicalID string   `json:"physicalId"`
-	CoreID     string   `json:"coreId"`
+	PhysicalID string   `json:"physical_id"`
+	CoreID     string   `json:"core_id"`
 	Cores      int32    `json:"cores"`
-	ModelName  string   `json:"modelName"`
+	ModelName  string   `json:"model_name"`
 	Mhz        float64  `json:"mhz"`
-	CacheSize  int32    `json:"cacheSize"`
+	CacheSize  int32    `json:"cache_size"`
 	Flags      []string `json:"flags"`
 }
 
diff --git a/disk.go b/disk.go
index d94caf7..9800bea 100644
--- a/disk.go
+++ b/disk.go
@@ -9,11 +9,11 @@ type DiskUsageStat struct {
 	Total             uint64  `json:"total"`
 	Free              uint64  `json:"free"`
 	Used              uint64  `json:"used"`
-	UsedPercent       float64 `json:"usedPercent"`
-	InodesTotal       uint64  `json:"inodesTotal"`
-	InodesUsed        uint64  `json:"inodesUsed"`
-	InodesFree        uint64  `json:"inodesFree"`
-	InodesUsedPercent float64 `json:"inodesUsedPercent"`
+	UsedPercent       float64 `json:"used_percent"`
+	InodesTotal       uint64  `json:"inodes_total"`
+	InodesUsed        uint64  `json:"inodes_used"`
+	InodesFree        uint64  `json:"inodes_free"`
+	InodesUsedPercent float64 `json:"inodes_used_percent"`
 }
 
 type DiskPartitionStat struct {
@@ -24,15 +24,15 @@ type DiskPartitionStat struct {
 }
 
 type DiskIOCountersStat struct {
-	ReadCount    uint64 `json:"readCount"`
-	WriteCount   uint64 `json:"writeCount"`
-	ReadBytes    uint64 `json:"readBytes"`
-	WriteBytes   uint64 `json:"writeBytes"`
-	ReadTime     uint64 `json:"readTime"`
-	WriteTime    uint64 `json:"writeTime"`
+	ReadCount    uint64 `json:"read_count"`
+	WriteCount   uint64 `json:"write_count"`
+	ReadBytes    uint64 `json:"read_bytes"`
+	WriteBytes   uint64 `json:"write_bytes"`
+	ReadTime     uint64 `json:"read_time"`
+	WriteTime    uint64 `json:"write_time"`
 	Name         string `json:"name"`
-	IoTime       uint64 `json:"ioTime"`
-	SerialNumber string `json:"serialNumber"`
+	IoTime       uint64 `json:"io_time"`
+	SerialNumber string `json:"serial_number"`
 }
 
 func (d DiskUsageStat) String() string {
diff --git a/disk_test.go b/disk_test.go
index 0f20030..7f85a48 100644
--- a/disk_test.go
+++ b/disk_test.go
@@ -58,7 +58,7 @@ func TestDiskUsageStat_String(t *testing.T) {
 		InodesFree:        6000,
 		InodesUsedPercent: 49.1,
 	}
-	e := `{"path":"/","total":1000,"free":2000,"used":3000,"usedPercent":50.1,"inodesTotal":4000,"inodesUsed":5000,"inodesFree":6000,"inodesUsedPercent":49.1}`
+	e := `{"path":"/","total":1000,"free":2000,"used":3000,"used_percent":50.1,"inodes_total":4000,"inodes_used":5000,"inodes_free":6000,"inodes_used_percent":49.1}`
 	if e != fmt.Sprintf("%v", v) {
 		t.Errorf("DiskUsageStat string is invalid: %v", v)
 	}
@@ -86,7 +86,7 @@ func TestDiskIOCountersStat_String(t *testing.T) {
 		WriteBytes:   400,
 		SerialNumber: "SERIAL",
 	}
-	e := `{"readCount":100,"writeCount":200,"readBytes":300,"writeBytes":400,"readTime":0,"writeTime":0,"name":"sd01","ioTime":0,"serialNumber":"SERIAL"}`
+	e := `{"read_count":100,"write_count":200,"read_bytes":300,"write_bytes":400,"read_time":0,"write_time":0,"name":"sd01","io_time":0,"serial_number":"SERIAL"}`
 	if e != fmt.Sprintf("%v", v) {
 		t.Errorf("DiskUsageStat string is invalid: %v", v)
 	}
diff --git a/docker_linux.go b/docker_linux.go
index 5320c31..7f00b2a 100644
--- a/docker_linux.go
+++ b/docker_linux.go
@@ -11,7 +11,7 @@ import (
 )
 
 type CgroupMemStat struct {
-	ContainerID             string `json:"containerid"`
+	ContainerID             string `json:"container_id"`
 	Cache                   uint64 `json:"cache"`
 	RSS                     uint64 `json:"rss"`
 	RSSHuge                 uint64 `json:"rss_huge"`
diff --git a/host.go b/host.go
index a204231..229c6ef 100644
--- a/host.go
+++ b/host.go
@@ -9,13 +9,13 @@ import (
 type HostInfoStat struct {
 	Hostname             string `json:"hostname"`
 	Uptime               uint64 `json:"uptime"`
-	Procs                uint64 `json:"procs"`          // number of processes
-	OS                   string `json:"os"`             // ex: freebsd, linux
-	Platform             string `json:"platform"`       // ex: ubuntu, linuxmint
-	PlatformFamily       string `json:"platformFamily"` // ex: debian, rhel
-	PlatformVersion      string `json:"platformVersion"`
-	VirtualizationSystem string `json:"virtualizationSystem"`
-	VirtualizationRole   string `json:"virtualizationRole"` // guest or host
+	Procs                uint64 `json:"procs"`           // number of processes
+	OS                   string `json:"os"`              // ex: freebsd, linux
+	Platform             string `json:"platform"`        // ex: ubuntu, linuxmint
+	PlatformFamily       string `json:"platform_family"` // ex: debian, rhel
+	PlatformVersion      string `json:"platform_version"`
+	VirtualizationSystem string `json:"virtualization_system"`
+	VirtualizationRole   string `json:"virtualization_role"` // guest or host
 
 }
 
diff --git a/host_test.go b/host_test.go
index 285ae13..1d6852e 100644
--- a/host_test.go
+++ b/host_test.go
@@ -47,7 +47,7 @@ func TestHostInfoStat_String(t *testing.T) {
 		OS:       "linux",
 		Platform: "ubuntu",
 	}
-	e := `{"hostname":"test","uptime":3000,"procs":100,"os":"linux","platform":"ubuntu","platformFamily":"","platformVersion":"","virtualizationSystem":"","virtualizationRole":""}`
+	e := `{"hostname":"test","uptime":3000,"procs":100,"os":"linux","platform":"ubuntu","platform_family":"","platform_version":"","virtualization_system":"","virtualization_role":""}`
 	if e != fmt.Sprintf("%v", v) {
 		t.Errorf("HostInfoStat string is invalid: %v", v)
 	}
diff --git a/mem.go b/mem.go
index 6f2e293..63cfad4 100644
--- a/mem.go
+++ b/mem.go
@@ -8,7 +8,7 @@ type VirtualMemoryStat struct {
 	Total       uint64  `json:"total"`
 	Available   uint64  `json:"available"`
 	Used        uint64  `json:"used"`
-	UsedPercent float64 `json:"usedPercent"`
+	UsedPercent float64 `json:"used_percent"`
 	Free        uint64  `json:"free"`
 	Active      uint64  `json:"active"`
 	Inactive    uint64  `json:"inactive"`
@@ -22,7 +22,7 @@ type SwapMemoryStat struct {
 	Total       uint64  `json:"total"`
 	Used        uint64  `json:"used"`
 	Free        uint64  `json:"free"`
-	UsedPercent float64 `json:"usedPercent"`
+	UsedPercent float64 `json:"used_percent"`
 	Sin         uint64  `json:"sin"`
 	Sout        uint64  `json:"sout"`
 }
diff --git a/mem_test.go b/mem_test.go
index 5631bdf..63421b3 100644
--- a/mem_test.go
+++ b/mem_test.go
@@ -35,7 +35,7 @@ func TestVirtualMemoryStat_String(t *testing.T) {
 		UsedPercent: 30.1,
 		Free:        40,
 	}
-	e := `{"total":10,"available":20,"used":30,"usedPercent":30.1,"free":40,"active":0,"inactive":0,"buffers":0,"cached":0,"wired":0,"shared":0}`
+	e := `{"total":10,"available":20,"used":30,"used_percent":30.1,"free":40,"active":0,"inactive":0,"buffers":0,"cached":0,"wired":0,"shared":0}`
 	if e != fmt.Sprintf("%v", v) {
 		t.Errorf("VirtualMemoryStat string is invalid: %v", v)
 	}
@@ -48,7 +48,7 @@ func TestSwapMemoryStat_String(t *testing.T) {
 		Free:        40,
 		UsedPercent: 30.1,
 	}
-	e := `{"total":10,"used":30,"free":40,"usedPercent":30.1,"sin":0,"sout":0}`
+	e := `{"total":10,"used":30,"free":40,"used_percent":30.1,"sin":0,"sout":0}`
 	if e != fmt.Sprintf("%v", v) {
 		t.Errorf("SwapMemoryStat string is invalid: %v", v)
 	}