diff --git a/jwt.go b/jwt.go
index 8366378..80381e3 100644
--- a/jwt.go
+++ b/jwt.go
@@ -33,13 +33,6 @@ var (
 	ErrParsingCredentials = errors.New("error parsing credentials")
 )
 
-// Config is a container for setting up the JWT middleware.
-type Config struct {
-	Secret string
-	Auth   AuthFunc
-	Claims ClaimsFunc
-}
-
 // AuthFunc is a type for delegating user authentication to the client-code.
 type AuthFunc func(string, string) error
 
@@ -50,12 +43,23 @@ type ClaimsFunc func(string) (map[string]interface{}, error)
 // or more route's in the client-code.
 type VerifyClaimsFunc func([]byte) error
 
+// Config is a container for setting up the JWT middleware.
+type Config struct {
+	Secret        string
+	Auth          AuthFunc
+	Claims        ClaimsFunc
+	IdentityField string
+	VerifyField   string
+}
+
 // Middleware is where we store all the specifics related to the client's
 // JWT needs.
 type Middleware struct {
-	secret string
-	auth   AuthFunc
-	claims ClaimsFunc
+	secret        string
+	auth          AuthFunc
+	claims        ClaimsFunc
+	identityField string
+	verifyField   string
 }
 
 // New creates a new Middleware from a user-specified configuration.
@@ -72,10 +76,18 @@ func New(c *Config) (*Middleware, error) {
 	if c.Claims == nil {
 		return nil, ErrMissingClaimsFunc
 	}
+	if c.IdentityField == "" {
+		c.IdentityField = "email"
+	}
+	if c.VerifyField == "" {
+		c.VerifyField = "password"
+	}
 	m := &Middleware{
-		secret: c.Secret,
-		auth:   c.Auth,
-		claims: c.Claims,
+		secret:        c.Secret,
+		auth:          c.Auth,
+		claims:        c.Claims,
+		identityField: c.IdentityField,
+		verifyField:   c.VerifyField,
 	}
 	return m, nil
 }
@@ -172,7 +184,22 @@ func (m *Middleware) GenerateToken() http.Handler {
 				message: "parsing authorization",
 			}
 		}
-		err = m.auth(b["email"], b["password"])
+		// Check if required fields are in the body
+		if _, ok := b[m.identityField]; !ok {
+			return &jwtError{
+				status:  http.StatusBadRequest,
+				err:     ErrParsingCredentials,
+				message: "parsing credentials, missing identity field",
+			}
+		}
+		if _, ok := b[m.verifyField]; !ok {
+			return &jwtError{
+				status:  http.StatusBadRequest,
+				err:     ErrParsingCredentials,
+				message: "parsing credentials, missing verify field",
+			}
+		}
+		err = m.auth(b[m.identityField], b[m.verifyField])
 		if err != nil {
 			return &jwtError{
 				status:  http.StatusInternalServerError,
@@ -192,7 +219,7 @@ func (m *Middleware) GenerateToken() http.Handler {
 		}
 
 		// Generate claims for user
-		claims, err := m.claims(b["email"])
+		claims, err := m.claims(m.identityField)
 		if err != nil {
 			return &jwtError{
 				status:  http.StatusInternalServerError,
diff --git a/jwt_test.go b/jwt_test.go
index c2ad4ba..ecdd39c 100644
--- a/jwt_test.go
+++ b/jwt_test.go
@@ -100,6 +100,12 @@ func TestNewJWTMiddleware(t *testing.T) {
 	if _, ok := claimsVal["iat"]; !ok {
 		t.Errorf("wanted a claims set, got %v", claimsVal)
 	}
+	if middleware.identityField != "email" {
+		t.Errorf("wanted email, got %v", middleware.identityField)
+	}
+	if middleware.verifyField != "password" {
+		t.Errorf("wanted password, got %v", middleware.verifyField)
+	}
 }
 
 func TestNewJWTMiddlewareNoConfig(t *testing.T) {