diff --git a/src/core/plugins/json-schema-2020-12-samples/fn/class/EncoderRegistry.js b/src/core/plugins/json-schema-2020-12-samples/fn/class/EncoderRegistry.js
index f9c575adf9a..ba2213a7731 100644
--- a/src/core/plugins/json-schema-2020-12-samples/fn/class/EncoderRegistry.js
+++ b/src/core/plugins/json-schema-2020-12-samples/fn/class/EncoderRegistry.js
@@ -9,6 +9,7 @@ import encodeQuotedPrintable from "../encoders/quoted-printable"
 import encodeBase16 from "../encoders/base16"
 import encodeBase32 from "../encoders/base32"
 import encodeBase64 from "../encoders/base64"
+import encodeBase64Url from "../encoders/base64url"
 
 class EncoderRegistry extends Registry {
   #defaults = {
@@ -19,6 +20,7 @@ class EncoderRegistry extends Registry {
     base16: encodeBase16,
     base32: encodeBase32,
     base64: encodeBase64,
+    base64url: encodeBase64Url,
   }
 
   data = { ...this.#defaults }
diff --git a/src/core/plugins/json-schema-2020-12-samples/fn/encoders/base64url.js b/src/core/plugins/json-schema-2020-12-samples/fn/encoders/base64url.js
new file mode 100644
index 00000000000..90f81b2a556
--- /dev/null
+++ b/src/core/plugins/json-schema-2020-12-samples/fn/encoders/base64url.js
@@ -0,0 +1,6 @@
+/**
+ * @prettier
+ */
+const encodeBase64Url = (content) => Buffer.from(content).toString("base64url")
+
+export default encodeBase64Url
diff --git a/test/unit/core/plugins/json-schema-2020-12-samples/fn.js b/test/unit/core/plugins/json-schema-2020-12-samples/fn.js
index 5d49a06196e..4d45ad21c4e 100644
--- a/test/unit/core/plugins/json-schema-2020-12-samples/fn.js
+++ b/test/unit/core/plugins/json-schema-2020-12-samples/fn.js
@@ -138,6 +138,15 @@ describe("sampleFromSchema", () => {
     ).toStrictEqual(
       "aHR0cHM6Ly9leGFtcGxlLmNvbS9kaWN0aW9uYXJ5L3t0ZXJtOjF9L3t0ZXJtfQ=="
     )
+    expect(
+      sample({
+        type: "string",
+        format: "uri-template",
+        contentEncoding: "base64url",
+      })
+    ).toStrictEqual(
+      "aHR0cHM6Ly9leGFtcGxlLmNvbS9kaWN0aW9uYXJ5L3t0ZXJtOjF9L3t0ZXJtfQ"
+    )
     expect(
       sample({
         type: "string",