gRPC Status Code Lookup — Map and Debug Microservice Error Codes
Look up any of the 17 gRPC status codes by number or name. Instantly see the description, HTTP status equivalent, and common causes for each code. Covers all codes from OK (0) through UNAUTHENTICATED (16). Free and runs entirely in your browser.
How to Use gRPC Status Code Lookup — Map and Debug Microservice Error Codes
How to Use the gRPC Status Code Lookup:
Enter a Code or Name: Type a numeric code (0–16) or a status name such as NOT_FOUND, UNAUTHENTICATED, or DEADLINE_EXCEEDED into the input field. The lookup is case-insensitive and accepts spaces or hyphens in place of underscores, so "not found", "Not_Found", and "NOT_FOUND" all resolve to code 5.
Read the Result: The result card shows the numeric code, canonical name, category (Success / Client Error / Server Error), and a plain-language description of what the status means in the gRPC protocol.
Check the HTTP Equivalent: Below the main card you will find the nearest HTTP status code equivalent. gRPC runs over HTTP/2 but uses its own status space. When building HTTP/gRPC transcoding proxies (e.g., gRPC-Gateway, Google Cloud Endpoints, or Envoy), this mapping tells you what HTTP status your proxy should emit.
Review Common Causes: The Common Causes list explains the typical scenarios that produce each status code in production. Use it to narrow down what went wrong in your service or client code without reading through the full gRPC spec.
Use the Quick Reference Table: When the input is empty a full reference table of all 17 codes is shown. Click any row to load its full details — useful when scanning codes you are not yet familiar with.
Copy the Code: Click Copy Code to copy the numeric code and name (e.g., "5 NOT_FOUND") to the clipboard for use in error messages, runbooks, or documentation.
Common Use Cases:
- Debugging gRPC errors: Quickly decode an unfamiliar status code returned in a log or error response during development or on-call.
- Client-side error handling: Decide which codes to retry (UNAVAILABLE, DEADLINE_EXCEEDED) vs. surface to the user (NOT_FOUND, PERMISSION_DENIED) when writing gRPC client code.
- HTTP/gRPC transcoding: Map gRPC status codes to HTTP status codes when configuring Envoy, gRPC-Gateway, or a hand-written REST wrapper.
- API documentation: Reference the exact canonical name and HTTP equivalent when writing runbooks, incident reports, or API docs.
- Code reviews: Verify that a service is returning semantically correct status codes (e.g., INVALID_ARGUMENT instead of INTERNAL for user input errors).
Tips:
- Prefer INVALID_ARGUMENT over INTERNAL for bad user input — INTERNAL signals a server-side bug, not a client mistake.
- UNAVAILABLE is the correct code for transient failures; clients should retry with exponential backoff. INTERNAL signals a non-transient bug and should not be auto-retried.
- FAILED_PRECONDITION means the system state must change before the operation can succeed; INVALID_ARGUMENT means the request itself is always wrong regardless of system state.
- DEADLINE_EXCEEDED may be returned even when the operation actually completed on the server — design clients to handle this ambiguity with idempotency keys.
Frequently Asked Questions
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