diff --git a/cmd/lagoon-linter/main.go b/cmd/lagoon-linter/main.go
index bda7927..a7241ee 100644
--- a/cmd/lagoon-linter/main.go
+++ b/cmd/lagoon-linter/main.go
@@ -11,8 +11,9 @@ var (
 
 // CLI represents the command-line interface.
 type CLI struct {
-	Validate ValidateCmd `kong:"cmd,default=1,help='(default) Validate the Lagoon YAML'"`
-	Version  VersionCmd  `kong:"cmd,help='Print version information'"`
+	Validate              ValidateCmd              `kong:"cmd,default=1,help='(default) Validate the Lagoon YAML'"`
+	Version               VersionCmd               `kong:"cmd,help='Print version information'"`
+	ValidateConfigMapJSON ValidateConfigMapJSONCmd `kong:"cmd,help='Validate the result of: kubectl get configmap -A -o json'"`
 }
 
 func main() {
diff --git a/cmd/lagoon-linter/validate.go b/cmd/lagoon-linter/validate.go
index cf48201..fe949b9 100644
--- a/cmd/lagoon-linter/validate.go
+++ b/cmd/lagoon-linter/validate.go
@@ -9,5 +9,5 @@ type ValidateCmd struct {
 
 // Run the validation of the Lagoon YAML.
 func (cmd *ValidateCmd) Run() error {
-	return lagoonyml.Lint(cmd.LagoonYAML, lagoonyml.RouteAnnotation())
+	return lagoonyml.LintFile(cmd.LagoonYAML, lagoonyml.RouteAnnotation())
 }
diff --git a/cmd/lagoon-linter/validateconfigmapjson.go b/cmd/lagoon-linter/validateconfigmapjson.go
new file mode 100644
index 0000000..10fc485
--- /dev/null
+++ b/cmd/lagoon-linter/validateconfigmapjson.go
@@ -0,0 +1,50 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+
+	"github.com/uselagoon/lagoon-linter/internal/lagoonyml"
+)
+
+// ValidateConfigMapJSONCmd represents the validate command.
+type ValidateConfigMapJSONCmd struct {
+	ConfigMapJSON string `kong:"default='configmap.json',help='Specify the configmap JSON file dump.'"`
+}
+
+// ConfigMap represents an individual configmap.
+type ConfigMap struct {
+	Data     map[string]string      `json:"data"`
+	Metadata map[string]interface{} `json:"metadata"`
+}
+
+// ConfigMapList represents a list of configmaps.
+type ConfigMapList struct {
+	ConfigMaps []ConfigMap `json:"items"`
+}
+
+// Run the validation of the Lagoon YAML dumps.
+func (cmd *ValidateConfigMapJSONCmd) Run() error {
+	// open the file
+	rawJSON, err := os.ReadFile(cmd.ConfigMapJSON)
+	if err != nil {
+		return fmt.Errorf("couldn't read file: %v", err)
+	}
+	var cml ConfigMapList
+	// unmarshal ConfigMapList
+	if err := json.Unmarshal(rawJSON, &cml); err != nil {
+		return fmt.Errorf("couldn't unmarshal JSON: %v", err)
+	}
+	// lint it
+	for _, cm := range cml.ConfigMaps {
+		if lagoonYAML, ok := cm.Data[".lagoon.yml"]; ok {
+			err := lagoonyml.LintYAML([]byte(lagoonYAML),
+				lagoonyml.RouteAnnotation())
+			if err != nil {
+				fmt.Printf("bad .lagoon.yml: %s: %v\n", cm.Metadata["namespace"], err)
+			}
+		}
+	}
+	return nil
+}
diff --git a/internal/lagoonyml/lint.go b/internal/lagoonyml/lint.go
index 4334d2d..fde2604 100644
--- a/internal/lagoonyml/lint.go
+++ b/internal/lagoonyml/lint.go
@@ -10,11 +10,11 @@ import (
 // Linter validates the given Lagoon struct.
 type Linter func(*Lagoon) error
 
-// Lint takes a file path, reads it, and applies `.lagoon.yml` lint policy to
+// LintFile takes a file path, reads it, and applies `.lagoon.yml` lint policy to
 // it. Lint returns an error of type ErrLint if it finds problems with the
 // file, a regular error if something else went wrong, and nil if the
 // `.lagoon.yml` is valid.
-func Lint(path string, linters ...Linter) error {
+func LintFile(path string, linters ...Linter) error {
 	var l Lagoon
 	rawYAML, err := os.ReadFile(path)
 	if err != nil {
@@ -33,3 +33,22 @@ func Lint(path string, linters ...Linter) error {
 	}
 	return nil
 }
+
+// LintYAML takes a byte slice containing raw YAML and applies `.lagoon.yml` lint policy to
+// it. Lint returns an error of type ErrLint if it finds problems with the
+// file, a regular error if something else went wrong, and nil if the
+// `.lagoon.yml` is valid.
+func LintYAML(rawYAML []byte, linters ...Linter) error {
+	var l Lagoon
+	if err := yaml.Unmarshal(rawYAML, &l); err != nil {
+		return fmt.Errorf("couldn't unmarshal YAML: %v", err)
+	}
+	for _, linter := range linters {
+		if err := linter(&l); err != nil {
+			return &ErrLint{
+				Detail: err.Error(),
+			}
+		}
+	}
+	return nil
+}
diff --git a/internal/lagoonyml/lint_test.go b/internal/lagoonyml/lint_test.go
index c68bc18..be074b8 100644
--- a/internal/lagoonyml/lint_test.go
+++ b/internal/lagoonyml/lint_test.go
@@ -46,7 +46,7 @@ func TestLint(t *testing.T) {
 	}
 	for name, tc := range testCases {
 		t.Run(name, func(tt *testing.T) {
-			err := lagoonyml.Lint(tc.input, lagoonyml.RouteAnnotation())
+			err := lagoonyml.LintFile(tc.input, lagoonyml.RouteAnnotation())
 			if tc.valid {
 				if err != nil {
 					tt.Fatalf("unexpected error %v", err)