Generate Outputs failing locally and in build #2994
Description
Environment information
System:
OS: Linux 6.6 Ubuntu 24.04.2 LTS 24.04.2 LTS (Noble Numbat)
CPU: (4) x64 Intel(R) Xeon(R) E-2244G CPU @ 3.80GHz
Memory: 3.89 GB / 9.71 GB
Shell: /bin/bash
Binaries:
Node: 20.19.2 - ~/.nvm/versions/node/v20.19.2/bin/node
Yarn: undefined - undefined
npm: 10.8.2 - ~/.nvm/versions/node/v20.19.2/bin/npm
pnpm: undefined - undefined
NPM Packages:
@aws-amplify/auth-construct: 1.8.1
@aws-amplify/backend: 1.16.1
@aws-amplify/backend-ai: Not Found
@aws-amplify/backend-auth: 1.7.1
@aws-amplify/backend-cli: 1.5.0
@aws-amplify/backend-data: 1.6.1
@aws-amplify/backend-deployer: 1.1.20
@aws-amplify/backend-function: 1.14.1
@aws-amplify/backend-output-schemas: 1.7.0
@aws-amplify/backend-output-storage: 1.3.1
@aws-amplify/backend-secret: 1.4.0
@aws-amplify/backend-storage: 1.4.1
@aws-amplify/cli-core: 1.4.1
@aws-amplify/client-config: 1.8.0
@aws-amplify/data-construct: 1.16.3
@aws-amplify/data-schema: 1.21.1
@aws-amplify/deployed-backend-client: 1.8.0
@aws-amplify/form-generator: 1.2.4
@aws-amplify/model-generator: 1.2.0
@aws-amplify/platform-core: 1.10.0
@aws-amplify/plugin-types: 1.11.0
@aws-amplify/sandbox: 1.2.12
@aws-amplify/schema-generator: 1.4.0
aws-amplify: 6.15.6
aws-cdk: 2.1029.2
aws-cdk-lib: 2.215.0
typescript: 5.9.2
AWS environment variables:
AWS_PROFILE = cloud
AWS_REGION = us-west-2
No CDK environment variables
Describe the bug
I have the frontend and backend split. Working for over a year but I suddenly am failing on the front end build and if I locally run npx ampx generate outputs.
[DEBUG] 2025-09-19T19:32:42.343Z: ZodError: [
{
"code": "invalid_key",
"origin": "record",
"issues": [
{
"expected": "object",
"code": "invalid_type",
"path": [],
"message": "Invalid input: expected object, received string"
}
],
"path": [
"AWS::Amplify::Platform"
],
"message": "Invalid key in record"
},
{
"code": "invalid_key",
"origin": "record",
"issues": [
{
"expected": "object",
"code": "invalid_type",
"path": [],
"message": "Invalid input: expected object, received string"
}
],
"path": [
"AWS::Amplify::Auth"
],
"message": "Invalid key in record"
},
{
"code": "invalid_key",
"origin": "record",
"issues": [
{
"expected": "object",
"code": "invalid_type",
"path": [],
"message": "Invalid input: expected object, received string"
}
],
"path": [
"AWS::Amplify::Function"
],
"message": "Invalid key in record"
}
]
at StackMetadataBackendOutputRetrievalStrategy.fetchBackendOutput (file:///home/cmxeon/_repos/amplify-sm9k/node_modules/@aws-amplify/deployed-backend-client/lib/stack_metadata_output_retrieval_strategy.js:52:72)
at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
at async DefaultBackendOutputClient.getOutput (file:///home/cmxeon/_repos/amplify-sm9k/node_modules/@aws-amplify/deployed-backend-client/lib/backend_output_client.js:18:24)
at async UnifiedClientConfigGenerator.generateClientConfig (file:///home/cmxeon/_repos/amplify-sm9k/node_modules/@aws-amplify/client-config/lib/unified_client_config_generator.js:25:22)
at async generateClientConfigToFile (file:///home/cmxeon/_repos/amplify-sm9k/node_modules/@aws-amplify/client-config/lib/generate_client_config_to_file.js:7:26)
at async ClientConfigGeneratorAdapter.generateClientConfigToFile (file:///home/cmxeon/_repos/amplify-sm9k/node_modules/@aws-amplify/backend-cli/lib/client-config/client_config_generator_adapter.js:25:34)
at async Object.handler (file:///home/cmxeon/_repos/amplify-sm9k/node_modules/@aws-amplify/backend-cli/lib/commands/generate/outputs/generate_outputs_command.js:37:9)
Reproduction steps
Run ampx generate outputs with the branch and app id