diff --git a/package-lock.json b/package-lock.json
index 593c0a91..b8c3314f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,9 +11,11 @@
       "dependencies": {
         "@11ty/eleventy": "^2.0.1",
         "@x-govuk/govuk-eleventy-plugin": "^6.2.1",
-        "luxon": "^3.4.4"
+        "luxon": "^3.4.4",
+        "parse5": "^7.1.2"
       },
       "devDependencies": {
+        "@cfworker/json-schema": "^1.12.8",
         "axe-core": "^4.9.0",
         "cypress": "^13.8.1",
         "cypress-axe": "^1.5.0"
@@ -191,6 +193,12 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@cfworker/json-schema": {
+      "version": "1.12.8",
+      "resolved": "https://registry.npmjs.org/@cfworker/json-schema/-/json-schema-1.12.8.tgz",
+      "integrity": "sha512-hi//AkiNRh5e8yLtpmRHnboHX051bow36+sn68f7yB163vOd3EDpUzUKH/wuNETFAyZAovsAHGAyMt+6oVb2Xg==",
+      "dev": true
+    },
     "node_modules/@colors/colors": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/@colors/colors/-/colors-1.5.0.tgz",
@@ -4955,6 +4963,28 @@
       "resolved": "https://registry.npmjs.org/parse-srcset/-/parse-srcset-1.0.2.tgz",
       "integrity": "sha1-8r0iH2zJcKk42IVWq8WJyqqiveE="
     },
+    "node_modules/parse5": {
+      "version": "7.1.2",
+      "resolved": "https://registry.npmjs.org/parse5/-/parse5-7.1.2.tgz",
+      "integrity": "sha512-Czj1WaSVpaoj0wbhMzLmWD69anp2WH7FXMB9n1Sy8/ZFF9jolSQVMu1Ij5WIyGmcBmhk7EOndpO4mIpihVqAXw==",
+      "dependencies": {
+        "entities": "^4.4.0"
+      },
+      "funding": {
+        "url": "https://github.com/inikulin/parse5?sponsor=1"
+      }
+    },
+    "node_modules/parse5/node_modules/entities": {
+      "version": "4.5.0",
+      "resolved": "https://registry.npmjs.org/entities/-/entities-4.5.0.tgz",
+      "integrity": "sha512-V0hjH4dGPh9Ao5p0MoRY6BVqtwCjhz6vI5LT8AJ55H+4g9/4vbHx1I54fS0XuclLhDHArPQCiMjDxjaL8fPxhw==",
+      "engines": {
+        "node": ">=0.12"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/entities?sponsor=1"
+      }
+    },
     "node_modules/parseurl": {
       "version": "1.3.3",
       "resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.3.tgz",
@@ -7003,6 +7033,12 @@
         "to-fast-properties": "^2.0.0"
       }
     },
+    "@cfworker/json-schema": {
+      "version": "1.12.8",
+      "resolved": "https://registry.npmjs.org/@cfworker/json-schema/-/json-schema-1.12.8.tgz",
+      "integrity": "sha512-hi//AkiNRh5e8yLtpmRHnboHX051bow36+sn68f7yB163vOd3EDpUzUKH/wuNETFAyZAovsAHGAyMt+6oVb2Xg==",
+      "dev": true
+    },
     "@colors/colors": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/@colors/colors/-/colors-1.5.0.tgz",
@@ -10550,6 +10586,21 @@
       "resolved": "https://registry.npmjs.org/parse-srcset/-/parse-srcset-1.0.2.tgz",
       "integrity": "sha1-8r0iH2zJcKk42IVWq8WJyqqiveE="
     },
+    "parse5": {
+      "version": "7.1.2",
+      "resolved": "https://registry.npmjs.org/parse5/-/parse5-7.1.2.tgz",
+      "integrity": "sha512-Czj1WaSVpaoj0wbhMzLmWD69anp2WH7FXMB9n1Sy8/ZFF9jolSQVMu1Ij5WIyGmcBmhk7EOndpO4mIpihVqAXw==",
+      "requires": {
+        "entities": "^4.4.0"
+      },
+      "dependencies": {
+        "entities": {
+          "version": "4.5.0",
+          "resolved": "https://registry.npmjs.org/entities/-/entities-4.5.0.tgz",
+          "integrity": "sha512-V0hjH4dGPh9Ao5p0MoRY6BVqtwCjhz6vI5LT8AJ55H+4g9/4vbHx1I54fS0XuclLhDHArPQCiMjDxjaL8fPxhw=="
+        }
+      }
+    },
     "parseurl": {
       "version": "1.3.3",
       "resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.3.tgz",