diff --git a/agent/access.go b/agent/access.go
index 2f4f66af..97d6ae3d 100644
--- a/agent/access.go
+++ b/agent/access.go
@@ -7,13 +7,13 @@ import (
 )
 
 type AccessPrivateRequest struct {
-	Token           string
-	BindAddress     string
-	AutoMode        bool
-	AutoAddress     string
-	AutoStartPort   uint16
-	AutoEndPort     uint16
-	ResponseHeaders []string
+	Token           string   `json:"token"`
+	BindAddress     string   `json:"bind_address"`
+	AutoMode        bool     `json:"auto_mode"`
+	AutoAddress     string   `json:"auto_address"`
+	AutoStartPort   uint16   `json:"auto_start_port"`
+	AutoEndPort     uint16   `json:"auto_end_port"`
+	ResponseHeaders []string `json:"response_headers"`
 }
 
 type access struct {
diff --git a/agent/registry.go b/agent/registry.go
index 7cb2a5d0..f3d500c8 100644
--- a/agent/registry.go
+++ b/agent/registry.go
@@ -2,12 +2,16 @@ package agent
 
 import (
 	"encoding/json"
+	"fmt"
 	"os"
 )
 
+const RegistryV = "1"
+
 type Registry struct {
-	ReservedShares  []*ShareReservedRequest
-	PrivateAccesses []*AccessPrivateRequest
+	V               string                  `json:"v"`
+	ReservedShares  []*ShareReservedRequest `json:"reserved_shares"`
+	PrivateAccesses []*AccessPrivateRequest `json:"private_accesses"`
 }
 
 func LoadRegistry(path string) (*Registry, error) {
@@ -19,10 +23,14 @@ func LoadRegistry(path string) (*Registry, error) {
 	if err := json.Unmarshal(data, r); err != nil {
 		return nil, err
 	}
+	if r.V != RegistryV {
+		return nil, fmt.Errorf("invalid registry version '%v'; expected '%v", r.V, RegistryV)
+	}
 	return r, nil
 }
 
 func (r *Registry) Save(path string) error {
+	r.V = RegistryV
 	data, err := json.MarshalIndent(r, "", "  ")
 	if err != nil {
 		return err
diff --git a/agent/share.go b/agent/share.go
index 7c5c3e8e..7064acf2 100644
--- a/agent/share.go
+++ b/agent/share.go
@@ -10,30 +10,30 @@ import (
 )
 
 type SharePrivateRequest struct {
-	Target       string
-	BackendMode  string
-	Insecure     bool
-	Closed       bool
-	AccessGrants []string
+	Target       string   `json:"target"`
+	BackendMode  string   `json:"backend_mode"`
+	Insecure     bool     `json:"insecure"`
+	Closed       bool     `json:"closed"`
+	AccessGrants []string `json:"access_grants"`
 }
 
 type SharePublicRequest struct {
-	Target                    string
-	BasicAuth                 []string
-	FrontendSelection         []string
-	BackendMode               string
-	Insecure                  bool
-	OauthProvider             string
-	OauthEmailAddressPatterns []string
-	OauthCheckInterval        string
-	Closed                    bool
-	AccessGrants              []string
+	Target                    string   `json:"target"`
+	BasicAuth                 []string `json:"basic_auth"`
+	FrontendSelection         []string `json:"frontend_selection"`
+	BackendMode               string   `json:"backend_mode"`
+	Insecure                  bool     `json:"insecure"`
+	OauthProvider             string   `json:"oauth_provider"`
+	OauthEmailAddressPatterns []string `json:"oauth_email_address_patterns"`
+	OauthCheckInterval        string   `json:"oauth_check_interval"`
+	Closed                    bool     `json:"closed"`
+	AccessGrants              []string `json:"access_grants"`
 }
 
 type ShareReservedRequest struct {
-	Token            string
-	OverrideEndpoint string
-	Insecure         bool
+	Token            string `json:"token"`
+	OverrideEndpoint string `json:"override_endpoint"`
+	Insecure         bool   `json:"insecure"`
 }
 
 type ShareReservedResponse struct {