diff --git a/packages/react-client/src/__tests__/ReactFlight-test.js b/packages/react-client/src/__tests__/ReactFlight-test.js
index f4a5929a2dd72..06dee1d54ed22 100644
--- a/packages/react-client/src/__tests__/ReactFlight-test.js
+++ b/packages/react-client/src/__tests__/ReactFlight-test.js
@@ -85,11 +85,11 @@ describe('ReactFlight', () => {
           );
           let expectedDigest = this.props.expectedMessage;
           if (
-            expectedDigest.startsWith('Error: {') ||
-            expectedDigest.startsWith('Error: <')
+            expectedDigest.startsWith('{') ||
+            expectedDigest.startsWith('<')
           ) {
             expectedDigest = '{}';
-          } else if (expectedDigest.startsWith('Error: [')) {
+          } else if (expectedDigest.startsWith('[')) {
             expectedDigest = '[]';
           }
           expect(this.state.error.digest).toContain(expectedDigest);
@@ -799,12 +799,12 @@ describe('ReactFlight', () => {
             <Throw value={new TypeError('This is a real Error.')} />
           </div>
         </ClientErrorBoundary>
-        <ClientErrorBoundary expectedMessage="Error: This is a string error.">
+        <ClientErrorBoundary expectedMessage="This is a string error.">
           <div>
             <Throw value="This is a string error." />
           </div>
         </ClientErrorBoundary>
-        <ClientErrorBoundary expectedMessage="Error: {message: ..., extra: ..., nested: ...}">
+        <ClientErrorBoundary expectedMessage="{message: ..., extra: ..., nested: ...}">
           <div>
             <Throw
               value={{
@@ -816,9 +816,7 @@ describe('ReactFlight', () => {
           </div>
         </ClientErrorBoundary>
         <ClientErrorBoundary
-          expectedMessage={
-            'Error: {message: "Short", extra: ..., nested: ...}'
-          }>
+          expectedMessage={'{message: "Short", extra: ..., nested: ...}'}>
           <div>
             <Throw
               value={{
@@ -829,32 +827,32 @@ describe('ReactFlight', () => {
             />
           </div>
         </ClientErrorBoundary>
-        <ClientErrorBoundary expectedMessage="Error: Symbol(hello)">
+        <ClientErrorBoundary expectedMessage="Symbol(hello)">
           <div>
             <Throw value={Symbol('hello')} />
           </div>
         </ClientErrorBoundary>
-        <ClientErrorBoundary expectedMessage="Error: 123">
+        <ClientErrorBoundary expectedMessage="123">
           <div>
             <Throw value={123} />
           </div>
         </ClientErrorBoundary>
-        <ClientErrorBoundary expectedMessage="Error: undefined">
+        <ClientErrorBoundary expectedMessage="undefined">
           <div>
             <Throw value={undefined} />
           </div>
         </ClientErrorBoundary>
-        <ClientErrorBoundary expectedMessage="Error: <div/>">
+        <ClientErrorBoundary expectedMessage="<div/>">
           <div>
             <Throw value={<div />} />
           </div>
         </ClientErrorBoundary>
-        <ClientErrorBoundary expectedMessage="Error: function Foo() {}">
+        <ClientErrorBoundary expectedMessage="function Foo() {}">
           <div>
             <Throw value={function Foo() {}} />
           </div>
         </ClientErrorBoundary>
-        <ClientErrorBoundary expectedMessage={'Error: ["array"]'}>
+        <ClientErrorBoundary expectedMessage={'["array"]'}>
           <div>
             <Throw value={['array']} />
           </div>
@@ -874,7 +872,7 @@ describe('ReactFlight', () => {
         } else if (typeof x === 'object' && x !== null) {
           return `digest({})`;
         }
-        return `digest(Error: ${String(x)})`;
+        return `digest(${String(x)})`;
       },
     });
 
diff --git a/packages/react-server-dom-webpack/src/__tests__/ReactFlightDOM-test.js b/packages/react-server-dom-webpack/src/__tests__/ReactFlightDOM-test.js
index 91ba06dd329b9..465123f825500 100644
--- a/packages/react-server-dom-webpack/src/__tests__/ReactFlightDOM-test.js
+++ b/packages/react-server-dom-webpack/src/__tests__/ReactFlightDOM-test.js
@@ -919,9 +919,7 @@ describe('ReactFlightDOM', () => {
       abort('for reasons');
     });
     if (__DEV__) {
-      expect(container.innerHTML).toBe(
-        '<p>Error: for reasons + a dev digest</p>',
-      );
+      expect(container.innerHTML).toBe('<p>for reasons + a dev digest</p>');
     } else {
       expect(container.innerHTML).toBe('<p>digest("for reasons")</p>');
     }
diff --git a/packages/react-server-dom-webpack/src/__tests__/ReactFlightDOMBrowser-test.js b/packages/react-server-dom-webpack/src/__tests__/ReactFlightDOMBrowser-test.js
index 2427317ce2c32..f8f3a1c3f2877 100644
--- a/packages/react-server-dom-webpack/src/__tests__/ReactFlightDOMBrowser-test.js
+++ b/packages/react-server-dom-webpack/src/__tests__/ReactFlightDOMBrowser-test.js
@@ -583,7 +583,7 @@ describe('ReactFlightDOMBrowser', () => {
       controller.abort('for reasons');
     });
     const expectedValue = __DEV__
-      ? '<p>Error: for reasons + a dev digest</p>'
+      ? '<p>for reasons + a dev digest</p>'
       : '<p>digest("for reasons")</p>';
     expect(container.innerHTML).toBe(expectedValue);
 
diff --git a/packages/react-server/src/ReactFizzServer.js b/packages/react-server/src/ReactFizzServer.js
index a928b2651a934..e8ea394386df6 100644
--- a/packages/react-server/src/ReactFizzServer.js
+++ b/packages/react-server/src/ReactFizzServer.js
@@ -33,6 +33,7 @@ import type {ComponentStackNode} from './ReactFizzComponentStack';
 import type {TreeContext} from './ReactFizzTreeContext';
 import type {ThenableState} from './ReactFizzThenable';
 import {enableRenderableContext} from 'shared/ReactFeatureFlags';
+import {describeObjectForErrorMessage} from 'shared/ReactSerializationErrors';
 
 import {
   scheduleWork,
@@ -816,18 +817,19 @@ function encodeErrorForBoundary(
 ) {
   boundary.errorDigest = digest;
   if (__DEV__) {
+    let message;
     // In dev we additionally encode the error message and component stack on the boundary
-    let errorMessage;
-    if (typeof error === 'string') {
-      errorMessage = error;
-    } else if (error && typeof error.message === 'string') {
-      errorMessage = error.message;
+    if (error instanceof Error) {
+      // eslint-disable-next-line react-internal/safe-string-coercion
+      message = String(error.message);
+    } else if (typeof error === 'object' && error !== null) {
+      message = describeObjectForErrorMessage(error);
     } else {
       // eslint-disable-next-line react-internal/safe-string-coercion
-      errorMessage = String(error);
+      message = String(error);
     }
 
-    boundary.errorMessage = errorMessage;
+    boundary.errorMessage = message;
     boundary.errorComponentStack = thrownInfo.componentStack;
   }
 }
diff --git a/packages/react-server/src/ReactFlightServer.js b/packages/react-server/src/ReactFlightServer.js
index 4c81931223e46..072a71b03dcc5 100644
--- a/packages/react-server/src/ReactFlightServer.js
+++ b/packages/react-server/src/ReactFlightServer.js
@@ -1678,10 +1678,10 @@ function emitErrorChunk(
         // eslint-disable-next-line react-internal/safe-string-coercion
         stack = String(error.stack);
       } else if (typeof error === 'object' && error !== null) {
-        message = 'Error: ' + describeObjectForErrorMessage(error);
+        message = describeObjectForErrorMessage(error);
       } else {
         // eslint-disable-next-line react-internal/safe-string-coercion
-        message = 'Error: ' + String(error);
+        message = String(error);
       }
     } catch (x) {
       message = 'An error occurred but serializing the error message failed.';