diff --git a/cucumber-core/src/main/java/io/cucumber/core/plugin/JsonFormatter.java b/cucumber-core/src/main/java/io/cucumber/core/plugin/JsonFormatter.java
index dba97e9619..416fef67f4 100644
--- a/cucumber-core/src/main/java/io/cucumber/core/plugin/JsonFormatter.java
+++ b/cucumber-core/src/main/java/io/cucumber/core/plugin/JsonFormatter.java
@@ -1,6 +1,7 @@
 package io.cucumber.core.plugin;
 
 import io.cucumber.jsonformatter.MessagesToJsonWriter;
+import io.cucumber.messages.MessageToNdjsonWriter.Serializer;
 import io.cucumber.messages.types.Envelope;
 import io.cucumber.plugin.ConcurrentEventListener;
 import io.cucumber.plugin.event.EventPublisher;
@@ -8,11 +9,12 @@
 import java.io.File;
 import java.io.IOException;
 import java.io.OutputStream;
+import java.io.Writer;
 import java.net.URI;
 
 import static io.cucumber.jsonformatter.MessagesToJsonWriter.builder;
 
-public final class JsonFormatter implements ConcurrentEventListener {
+public final class JsonFormatter implements ConcurrentEventListener, Serializer {
 
     private final MessagesToJsonWriter writer;
 
@@ -45,4 +47,9 @@ private void write(Envelope event) {
             }
         }
     }
+
+    @Override
+    public void writeValue(Writer writer, Envelope value) throws IOException {
+        Jackson.OBJECT_MAPPER.writeValue(writer, value);
+    }
 }