Add parseJSON template func

template/template.go

@@ -15,6 +15,7 @@ package template
 
 import (
 	"bytes"
+	"encoding/json"
 	tmplhtml "html/template"
 	"io"
 	"net/url"
@@ -205,6 +206,11 @@ var DefaultFuncs = FuncMap{
 		}
 		return t.In(loc), nil
 	},
+	"parseJSON": func(jsonStr string) (interface{}, error) {
+		var result interface{}
+		err := json.Unmarshal([]byte(jsonStr), &result)
+		return result, err
+	},
 	"since":            time.Since,
 	"humanizeDuration": commonTemplates.HumanizeDuration,
 }

template/template_test.go

@@ -561,7 +561,18 @@ func TestTemplateFuncs(t *testing.T) {
 		in:    "{{ . | since | humanizeDuration }}",
 		data:  time.Now().Add(-1 * time.Hour),
 		exp:   "1h 0m 0s",
-	}} {
+	},
+		{
+			title: "Template using parseJSON - valid JSON",
+			in:    `{{ $json := . | parseJSON }}{{ $json.key }}`,
+			data:  `{"key": "value"}`,
+			exp:   "value",
+		}, {
+			title:  "Template using parseJSON - invalid JSON",
+			in:     `{{ . | parseJSON }}`,
+			data:   `{"key": "value"`,
+			expErr: "template: :1:7: executing \"\" at <parseJSON>: error calling parseJSON: unexpected end of JSON input",
+		}} {
 		tc := tc
 		t.Run(tc.title, func(t *testing.T) {
 			wg := sync.WaitGroup{}