diff --git a/.changeset/thin-numbers-hammer.md b/.changeset/thin-numbers-hammer.md
new file mode 100644
index 00000000..95d69394
--- /dev/null
+++ b/.changeset/thin-numbers-hammer.md
@@ -0,0 +1,5 @@
+---
+'@forgerock/javascript-sdk': minor
+---
+
+Add feature to provide JSON outcome response to callback if requested
diff --git a/packages/javascript-sdk/src/fr-webauthn/fr-webauthn.mock.data.ts b/packages/javascript-sdk/src/fr-webauthn/fr-webauthn.mock.data.ts
index 72e7c279..73a4fb6a 100644
--- a/packages/javascript-sdk/src/fr-webauthn/fr-webauthn.mock.data.ts
+++ b/packages/javascript-sdk/src/fr-webauthn/fr-webauthn.mock.data.ts
@@ -373,3 +373,119 @@ export const webAuthnAuthMetaCallback70StoredUsername = {
     },
   ],
 };
+
+export const webAuthnAuthMetaCallbackJsonResponse = {
+  authId:
+    'eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.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.EuDmsY3C6I6vc_x7KlkW4rSQJY1FWevbGGmxkSu4HVU',
+  callbacks: [
+    {
+      type: 'MetadataCallback',
+      output: [
+        {
+          name: 'data',
+          value: {
+            _action: 'webauthn_authentication',
+            challenge: 'qnMsxgya8h6mUc6OyRu8jJ6Oq16tHV3cgE7juXGMDbg=',
+            allowCredentials: '',
+            _allowCredentials: [],
+            timeout: '60000',
+            userVerification: 'preferred',
+            relyingPartyId: 'rpId: "humorous-cuddly-carrot.glitch.me",',
+            _relyingPartyId: 'humorous-cuddly-carrot.glitch.me',
+            _type: 'WebAuthn',
+            supportsJsonResponse: true,
+          },
+        },
+      ],
+    },
+    {
+      type: 'HiddenValueCallback',
+      output: [
+        {
+          name: 'value',
+          value: 'false',
+        },
+        {
+          name: 'id',
+          value: 'webAuthnOutcome',
+        },
+      ],
+      input: [
+        {
+          name: 'IDToken2',
+          value: 'webAuthnOutcome',
+        },
+      ],
+    },
+  ],
+};
+
+export const webAuthnRegMetaCallbackJsonResponse = {
+  authId:
+    'eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJ3aGl0ZWxpc3Qtc3RhdGUiOiJjMjMzNDRkMC04ZTlhLTRhM2QtODZkMS1mNTIwNTExZmM3NjciLCJhdXRoSW5kZXhWYWx1ZSI6IkFuZHlXZWJBdXRobiIsIm90ayI6ImFzdTNjMmo4YThta2w0aWQyN3FndGFuaTVqIiwiYXV0aEluZGV4VHlwZSI6InNlcnZpY2UiLCJyZWFsbSI6Ii9hbHBoYSIsInNlc3Npb25JZCI6IipBQUpUU1FBQ01ESUFCSFI1Y0dVQUNFcFhWRjlCVlZSSUFBSlRNUUFDTURFLipleUowZVhBaU9pSktWMVFpTENKamRIa2lPaUpLVjFRaUxDSmhiR2NpT2lKSVV6STFOaUo5LlpYbEtNR1ZZUVdsUGFVcExWakZSYVV4RFNteGliVTFwVDJsS1FrMVVTVFJSTUVwRVRGVm9WRTFxVlRKSmFYZHBXVmQ0YmtscWIybGFSMng1U1c0d0xpNVJkVXBMWTBnNGIwUjViemxZV0ZKcE0wNDJjQzFCTG0xRU0xOWFOVlZrZURGeVYxUk9lR2MwVUVWNFNHMW1OMGN5TkdoSU1YRXpPV0ZhVDNoaWREbFlUa000VEZscU1VRm1la1pXUzBkME1ubEJVMmxvT1hCNmJIRjNOVTQ0Y0ZsblZXRnplV2g1VEdWUFdtWldaVkpqVldNMmNGRjJOVmxhZEROdGNHWnZOMWRuV1hsWVNrRnZRWGQxZEhka2NYVlhaVXBYWkRScVl6TlBkRTFOTlVOV1NWaGtTRFZqVURGTVlrRjVTblJHWVd4NlIyWkplVGRtWW0xQll6SkZTbGxLUVdGNFZqTTRSa0l0TjFWVFFWZEVaMWxsUW14elYzQXRjWEZSYlRSdFIyUnBkRlpwYzBFdGNWRTFUbEpaU0cxQlJXSnpVVXBtWVdoRVQzSllUMFo1ZVZNM2VUUnVaV3BHUjNaWExVaFFRV054YjJ0TGNFMWZhVFkyWVRrdFZrbE9UMWxaY0RoWFQxaFFiR2hVTWt4YVIwVk1SVEpuVUhsWFkzcDJNV2xCVjBwcU4zVlVjVWx2UjFCTllVNUxSSEJKZGpaTk4wdFphVnA2YzJoUE9IRmxTMWw1VjJ3emNWWk9Tek4wWjJOamNGbERZVkJmT0ZGcGNuZG9iMkV3UjNOSWRIRk9SR04yYlhCUldIbE1ZM1Z3VGpkdmJGbDNhREV5WlVsTU9HaEZla0pLUldkMlVFaGpTM0JDYmxKVVYwOWlkemhJUlZobFJFZzRNbGxDWmxJdGVXMXpYMjlZT0c1dFpURldhbFJvUVZnMlRHZGtkbkUwVTJ4MmJYVjFYMTlzZVZack9GQnVZV3RDTldvMWVHOUtkVkUwTjFwRlZERnBUbGsxVkhCQlVHNUNOMjVuVVhaeWExRnlWR1ZHZFZKdU1EUlFPV1E0TTJ0MFVXcEhaMlpyUVdkbVNrNWpiek54YUZOR1dGb3dWM2swWldkUlpHdGhUVFU0ZGxSVVJtRlhlRjl1VERkdk9XdGFha3hXUjA4eFh6Sk9Oa0ZGVW5SVWFpMU9MVll6UmxwMlJYTnpRbnBTV1V0V2VGUm5UMTlRUTNWVmMxaDJjVzFVU1ZkcFNUQnhYekE0ZFhSVlVXcGpRMHhWUjNCVlZHRnVhR0pCVldKV1R6SnZVWHBVVTJ4bkxUTTJhakJWZVMxdlYxQTVNblo0ZVhvMWRUSkZkRVpwWkRaRGMxWmFMVVl3TFdkbWNFTnBkUzFGVlVzNFJITklhelZCUXpFNVp6VnRNMkY0Tmw5TFZuTlBkMmxIWDIxMU5tcHhOVzlsTlhkbFFtVm9iRE5RV0ZCTmFERTRTRWRrTTFOVVRHUmphVjl0VXpKTFJuYzJTM2xvWVd0a1dIcElXREZSTFdwRVIzWkRlRzF4YzJGcFZuUllhVlJSTXpSM1pVdGFhRk15VEVSVVpITklWM0JZTFdReFREa3lSMlJrVFc1UGJWRkhlV3A0WkRScU16TlFPVW96TVdGNGMyVXhZbDlFY1MxeWFXZHZZM2huTG1wR2VXWmxRVTlRVjBwMldUaHNaV3B1Wm1RemIyYy43YmdYcE5RNGRLSEpTeGpmUEVZZm44MGxZc3owaXBwNngyaURtRXlqd1JjIiwiZXhwIjoxNzQyODQzMDQ4LCJpYXQiOjE3NDI4NDI3NDh9.3zuPwPZVeFSwezhmzSZe-HW-22zo1HXwEPJO5jGl0Cg',
+  callbacks: [
+    {
+      type: 'MetadataCallback',
+      output: [
+        {
+          name: 'data',
+          value: {
+            _action: 'webauthn_registration',
+            challenge: 'QMmVc2lSU6G+jx6IYNOd6EaPz6X8jBzkxI9TMdVyWTw=',
+            attestationPreference: 'none',
+            userName: 'demo',
+            userId: 'NzcyNTI2NmMtYmZiZi00ZGFiLWFhYzEtNjY3NjUyMGIzNmZl',
+            relyingPartyName: 'ForgeRock',
+            authenticatorSelection:
+              '{"userVerification":"preferred","residentKey":"required","requireResidentKey":true}',
+            _authenticatorSelection: {
+              userVerification: 'preferred',
+              residentKey: 'required',
+              requireResidentKey: true,
+            },
+            pubKeyCredParams:
+              '[ { "type": "public-key", "alg": -257 }, { "type": "public-key", "alg": -7 } ]',
+            _pubKeyCredParams: [
+              {
+                type: 'public-key',
+                alg: -257,
+              },
+              {
+                type: 'public-key',
+                alg: -7,
+              },
+            ],
+            timeout: '60000',
+            excludeCredentials: '',
+            _excludeCredentials: [],
+            displayName: 'demo',
+            relyingPartyId: 'id: "idc.petrov.ca",',
+            _relyingPartyId: 'idc.petrov.ca',
+            extensions: {},
+            _type: 'WebAuthn',
+            supportsJsonResponse: true,
+          },
+        },
+      ],
+    },
+    {
+      type: 'HiddenValueCallback',
+      output: [
+        {
+          name: 'value',
+          value: 'false',
+        },
+        {
+          name: 'id',
+          value: 'webAuthnOutcome',
+        },
+      ],
+      input: [
+        {
+          name: 'IDToken2',
+          value: 'webAuthnOutcome',
+        },
+      ],
+    },
+  ],
+};
diff --git a/packages/javascript-sdk/src/fr-webauthn/index.ts b/packages/javascript-sdk/src/fr-webauthn/index.ts
index 063f6942..a2eca634 100644
--- a/packages/javascript-sdk/src/fr-webauthn/index.ts
+++ b/packages/javascript-sdk/src/fr-webauthn/index.ts
@@ -104,20 +104,28 @@ abstract class FRWebAuthn {
     const { hiddenCallback, metadataCallback, textOutputCallback } = this.getCallbacks(step);
     if (hiddenCallback && (metadataCallback || textOutputCallback)) {
       let outcome: ReturnType<typeof this.getAuthenticationOutcome>;
+      let credential: PublicKeyCredential | null = null;
 
       try {
         let publicKey: PublicKeyCredentialRequestOptions;
         if (metadataCallback) {
           const meta = metadataCallback.getOutputValue('data') as WebAuthnAuthenticationMetadata;
           publicKey = this.createAuthenticationPublicKey(meta);
+
+          credential = await this.getAuthenticationCredential(
+            publicKey as PublicKeyCredentialRequestOptions,
+          );
+          outcome = this.getAuthenticationOutcome(credential);
         } else if (textOutputCallback) {
           publicKey = parseWebAuthnAuthenticateText(textOutputCallback.getMessage());
+
+          credential = await this.getAuthenticationCredential(
+            publicKey as PublicKeyCredentialRequestOptions,
+          );
+          outcome = this.getAuthenticationOutcome(credential);
+        } else {
+          throw new Error('No Credential found from Public Key');
         }
-        // TypeScript doesn't like `publicKey` being assigned in conditionals above
-        // eslint-disable-next-line @typescript-eslint/ban-ts-comment
-        // @ts-ignore
-        const credential = await this.getAuthenticationCredential(publicKey);
-        outcome = this.getAuthenticationOutcome(credential);
       } catch (error) {
         if (!(error instanceof Error)) throw error;
         // NotSupportedError is a special case
@@ -129,6 +137,18 @@ abstract class FRWebAuthn {
         throw error;
       }
 
+      if (metadataCallback) {
+        const meta = metadataCallback.getOutputValue('data') as WebAuthnAuthenticationMetadata;
+        if (meta?.supportsJsonResponse && credential && 'authenticatorAttachment' in credential) {
+          hiddenCallback.setInputValue(
+            JSON.stringify({
+              authenticatorAttachment: credential.authenticatorAttachment,
+              legacyData: outcome,
+            }),
+          );
+          return step;
+        }
+      }
       hiddenCallback.setInputValue(outcome);
       return step;
     } else {
@@ -154,19 +174,20 @@ abstract class FRWebAuthn {
     const { hiddenCallback, metadataCallback, textOutputCallback } = this.getCallbacks(step);
     if (hiddenCallback && (metadataCallback || textOutputCallback)) {
       let outcome: OutcomeWithName<string, AttestationType, PublicKeyCredential>;
+      let credential: PublicKeyCredential | null = null;
 
       try {
         let publicKey: PublicKeyCredentialRequestOptions;
         if (metadataCallback) {
           const meta = metadataCallback.getOutputValue('data') as WebAuthnRegistrationMetadata;
           publicKey = this.createRegistrationPublicKey(meta);
-          const credential = await this.getRegistrationCredential(
+          credential = await this.getRegistrationCredential(
             publicKey as PublicKeyCredentialCreationOptions,
           );
           outcome = this.getRegistrationOutcome(credential);
         } else if (textOutputCallback) {
           publicKey = parseWebAuthnRegisterText(textOutputCallback.getMessage());
-          const credential = await this.getRegistrationCredential(
+          credential = await this.getRegistrationCredential(
             publicKey as PublicKeyCredentialCreationOptions,
           );
           outcome = this.getRegistrationOutcome(credential);
@@ -183,6 +204,21 @@ abstract class FRWebAuthn {
         hiddenCallback.setInputValue(`${WebAuthnOutcome.Error}::${error.name}:${error.message}`);
         throw error;
       }
+
+      if (metadataCallback) {
+        const meta = metadataCallback.getOutputValue('data') as WebAuthnAuthenticationMetadata;
+        if (meta?.supportsJsonResponse && credential && 'authenticatorAttachment' in credential) {
+          hiddenCallback.setInputValue(
+            JSON.stringify({
+              authenticatorAttachment: credential.authenticatorAttachment,
+              legacyData:
+                deviceName && deviceName.length > 0 ? `${outcome}::${deviceName}` : outcome,
+            }),
+          );
+          return step;
+        }
+      }
+
       hiddenCallback.setInputValue(
         deviceName && deviceName.length > 0 ? `${outcome}::${deviceName}` : outcome,
       );
diff --git a/packages/javascript-sdk/src/fr-webauthn/interfaces.ts b/packages/javascript-sdk/src/fr-webauthn/interfaces.ts
index de57c7a6..917b5734 100644
--- a/packages/javascript-sdk/src/fr-webauthn/interfaces.ts
+++ b/packages/javascript-sdk/src/fr-webauthn/interfaces.ts
@@ -73,6 +73,7 @@ interface WebAuthnRegistrationMetadata {
   userId: string;
   userName: string;
   displayName?: string;
+  supportsJsonResponse?: boolean;
 }
 
 interface WebAuthnAuthenticationMetadata {
@@ -82,6 +83,7 @@ interface WebAuthnAuthenticationMetadata {
   relyingPartyId: string;
   timeout: number;
   userVerification: UserVerificationType;
+  supportsJsonResponse?: boolean;
 }
 
 interface WebAuthnCallbacks {