InvalidStorageClass
AWS InvalidStorageClass means the requested Amazon S3 storage class value is not valid for that operation or context (HTTP 400).
Last reviewed: February 18, 2026|Editorial standard: source-backed technical guidance
What Does Invalid Storage Class Mean?
S3 rejects the request before object state changes because the provided storage class is invalid or incompatible with the operation context.
Common Causes
- -StorageClass value is unsupported for the target operation or context.
- -Region/operation constraints do not allow requested storage class.
- -Client defaults or serialization emit an invalid storage class value.
How to Fix Invalid Storage Class
- 1Use a supported StorageClass enum for this operation and region.
- 2Validate storage-class compatibility before request creation.
- 3Retry with explicitly validated storage class settings.
Step-by-Step Diagnosis for Invalid Storage Class
- 1Capture StorageClass value from failing request payload/headers.
- 2Cross-check operation support matrix for requested storage class.
- 3Inspect client defaults and enum mappings for stale values.
Storage Class Compatibility Validation
- -Validate requested storage class against operation and region support (example: workflow sends class not accepted by that API path).
- -Inspect lifecycle and transition logic producing class values (example: stale enum mapping emits deprecated class token).
Request Builder and Policy Checks
- -Audit SDK/client defaults that auto-populate StorageClass (example: default override in one service conflicts with bucket policy expectations).
- -Compare failing request against minimal valid PutObject/CopyObject variant (example: explicit StorageClass field only in failing path).
How to Verify the Fix
- -Re-run request with supported StorageClass and confirm success.
- -Validate resulting object metadata and lifecycle behavior.
- -Ensure no repeated InvalidStorageClass failures in logs.
How to Prevent Recurrence
- -Type-check storage class values and region compatibility before deploy.
- -Maintain one source of truth for storage-class defaults.
- -Continuously test storage-class transitions in staging.
Pro Tip
- -maintain a per-operation storage-class allowlist in shared client code so invalid class values are blocked before request signing.
Decision Support
Compare Guide
HTTP 400 vs 422: Bad Request vs Unprocessable Content
Fix API payload issues faster by using 400 for malformed syntax and 422 for semantic validation failures, so clients correct format before business rules.
Playbook
CORS Error Fix Playbook (Preflight / Origin / Credentials)
Use this playbook to separate browser-enforced cross-origin policy failures from server-side CORS header and route defects and apply strict origin and credential controls safely.
Playbook
Validation Failure Playbook (400 / 422 / INVALID_ARGUMENT)
Use this playbook to separate malformed-request failures from semantic validation failures, then fix request contracts without broad server-side bypasses.
Official References
Provider Context
This guidance is specific to AWS services. Always validate implementation details against official provider documentation before deploying to production.