diff --git a/packages/gatsby-parcel-config/lib/index.json b/packages/gatsby-parcel-config/lib/index.json
index 37becb03806f9..2b1adb9f7d5a6 100644
--- a/packages/gatsby-parcel-config/lib/index.json
+++ b/packages/gatsby-parcel-config/lib/index.json
@@ -3,7 +3,8 @@
   "transformers": {
     "*.{js,mjs,jsm,jsx,es6,cjs,ts,tsx}": [
       "@parcel/transformer-js"
-    ]
+    ],
+    "*.{json,json5}": ["@parcel/transformer-json"]
   },
   "namers": ["@gatsbyjs/parcel-namer-relative-to-cwd", "@parcel/namer-default"],
   "runtimes": ["@parcel/runtime-js"],
diff --git a/packages/gatsby-parcel-config/package.json b/packages/gatsby-parcel-config/package.json
index 98237c7e97cf0..42a39b9ad907c 100644
--- a/packages/gatsby-parcel-config/package.json
+++ b/packages/gatsby-parcel-config/package.json
@@ -24,7 +24,8 @@
     "@parcel/reporter-dev-server": "2.6.2",
     "@parcel/resolver-default": "2.6.2",
     "@parcel/runtime-js": "2.6.2",
-    "@parcel/transformer-js": "2.6.2"
+    "@parcel/transformer-js": "2.6.2",
+    "@parcel/transformer-json": "2.6.2"
   },
   "peerDependencies": {
     "@parcel/core": "^2.0.0"
diff --git a/yarn.lock b/yarn.lock
index 87d8fe5d2646f..58b6d940dd1a0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3499,6 +3499,14 @@
     regenerator-runtime "^0.13.7"
     semver "^5.7.1"
 
+"@parcel/transformer-json@2.6.2":
+  version "2.6.2"
+  resolved "https://registry.yarnpkg.com/@parcel/transformer-json/-/transformer-json-2.6.2.tgz#37a5c3f4571c81e1a5f2d0c77f266b56e3866ad5"
+  integrity sha512-QGcIIvbPF/u10ihYvQhxXqb2QMXWSzcBxJrOSIXIl74TUGrWX05D5LmjDA/rzm/n/kvRnBkFNP60R/smYb8x+Q==
+  dependencies:
+    "@parcel/plugin" "2.6.2"
+    json5 "^2.2.0"
+
 "@parcel/types@2.6.2":
   version "2.6.2"
   resolved "https://registry.yarnpkg.com/@parcel/types/-/types-2.6.2.tgz#216313bcaf625e59a2bd525a00c3b1f6701b0d92"