Terraform CLI
Terraform failed to marshal state to JSON with unsupported attribute
Failed to marshal state to json: unsupported attribute
Terraform failed while processing state because the provider schema and the stored state no longer agree about an attribute present in the state.
Observed message
Failed to marshal state to json: unsupported attribute
Why it happens
- The provider schema changed and no longer recognizes an attribute stored in state.
- A provider migration or upgrade left state data out of sync with the current schema version.
- Plan-only testing or upgrade workflows exposed a schema mismatch between state and provider.
How to fix it
- Review recent provider or framework migrations that changed resource schema behavior.
- Align the provider version and expected state schema before retrying the operation.
- Use the state upgrade or migration workflow recommended by the provider or testing guide.
