Error Rosetta

"The Rosetta Stone let scholars read Egyptian hieroglyphics by providing the same text in three languages. Your compiler already speaks three languages — the error code, the stack trace, and the actual problem. It just refuses to use the third one."

What It Does

You see this:

CODEBLOCK0

Error Rosetta gives you this:

CODEBLOCK1

The Translation Layers

Layer 1: Error Identification

Every error message, no matter how cryptic, contains these decodable components:

Component	What It Tells You	Example
Error Type	Category of problem	INLINECODE0, ENOENT, HTTP 422, INLINECODE3
Error Message

What went wrong (usually poorly) | "Cannot read properties of undefined" |
| Location | Where it happened | File path + line number |
| Stack Trace | How it got there | Call chain from entry point to error |
| Error Code | Machine-readable identifier | E0308, TS2345, EPERM |

Layer 2: Context Enrichment

Raw error → enriched with your codebase context:

CODEBLOCK2

Layer 3: Plain Language Translation

The enriched error is translated into three outputs:

CODEBLOCK3

Error Pattern Library

JavaScript/TypeScript

Cryptic Error	Plain Translation	Common Fix
INLINECODE7	You're accessing .x on something that doesn't exist	Add optional chaining ?.x or check for null/undefined first
INLINECODE10

You're calling something that isn't callable — it's a value, not a function | Check: did you forget () on a prior call? Is the import correct? | | Maximum call stack size exceeded | Infinite recursion — a function calls itself forever | Find the recursive call missing its base case | | Cannot assign to 'x' because it is a read-only property | You're mutating something that shouldn't be mutated | Use spread/Object.assign to create a new object instead | | Module not found: Can't resolve 'x' | Import path is wrong or package isn't installed | Check spelling, check node_modules, run npm install | | TS2345: Argument of type 'X' is not assignable to parameter of type 'Y' | Type mismatch — you're passing the wrong shape of data | Check what the function expects vs. what you're giving it |

Python

Cryptic Error	Plain Translation	Common Fix
INLINECODE16	A function returned None when you expected an object	The function upstream returned nothing — check its return paths
INLINECODE17

Whitespace is wrong (tabs vs. spaces or wrong level) | Fix indentation — use consistent spaces | | RecursionError: maximum recursion depth exceeded | Infinite recursion | Find the missing base case in your recursive function | | KeyError: 'x' | You're accessing a dictionary key that doesn't exist | Use .get('x', default) or check if 'x' in dict first | | ImportError: cannot import name 'x' from 'y' | The thing you're importing doesn't exist in that module | Check spelling, check the module's __init__.py, check version |

Rust

Cryptic Error	Plain Translation	Common Fix
INLINECODE24	You used a value after giving ownership to something else	Clone it, use a reference, or restructure to avoid the move
INLINECODE25

Expected one type, got another | Check your function signatures and return types | | E0502: cannot borrow 'x' as mutable because it is also borrowed as immutable | You have a read reference and are trying to write | Restructure to not hold both borrows simultaneously | | E0106: missing lifetime specifier | Rust can't figure out how long a reference should live | Add explicit lifetime annotations |

Go

Cryptic Error	Plain Translation	Common Fix
INLINECODE28	Type mismatch in assignment or function call	Check the expected type and convert
INLINECODE29

Using a name that doesn't exist in this scope | Check import, check spelling, check scope | | fatal error: all goroutines are asleep - deadlock! | Every goroutine is waiting for something and nothing can proceed | Check channel operations — something isn't sending or receiving | | panic: runtime error: index out of range | Array/slice access beyond its length | Check bounds before accessing |

System/OS Errors

Cryptic Error	Plain Translation	Common Fix
INLINECODE32	File or directory doesn't exist at that path	Check the path — typo? Missing directory? Relative vs absolute?
INLINECODE33

You don't have permission to access this | Check file permissions, check if you need sudo/admin | | EADDRINUSE: address already in use | Another process is already using that port | Kill the other process or use a different port | | ENOMEM: not enough memory | System is out of memory | Check for memory leaks, increase available memory, or reduce consumption | | ETIMEDOUT: connection timed out | The remote host didn't respond in time | Check network, check if the service is running, check firewall |

HTTP Errors

Code	What The Server Actually Means	Developer Action
INLINECODE37	"Your request is malformed — I can't even parse it"	Check request body format, content-type header, required fields
INLINECODE38

"Who are you? I don't see valid credentials" | Check auth token, check if it's expired, check the auth header format | | 403 Forbidden | "I know who you are. You're not allowed" | Check permissions/roles, check if the resource requires different access | | 404 Not Found | "That URL doesn't point to anything" | Check the URL path, check if the resource exists, check API version | | 409 Conflict | "This conflicts with the current state" | Check for duplicate resources, check version/ETag conflicts | | 422 Unprocessable Entity | "I can read your request but the data doesn't make sense" | Check validation rules, check field values against API docs | | 429 Too Many Requests | "Slow down. You're hitting the rate limit" | Add backoff/retry logic, check rate limit headers | | 500 Internal Server Error | "Something broke on my end, not your fault" | Check server logs, it's a bug in the backend | | 502 Bad Gateway | "I'm a proxy and the server behind me is broken" | Check the upstream service, check proxy config | | 503 Service Unavailable | "I'm overloaded or doing maintenance" | Retry with backoff, check status page |

The Translation Process

CODEBLOCK4

Output Format

CODEBLOCK5

When to Invoke

• - Every time you see an error you don't immediately understand. That's the whole point.
• When onboarding in a new language or framework (the error messages are a new dialect)
• When the error is in a dependency's code and you need to understand what YOU did wrong
• When debugging a CI failure with a wall of log output
• When a user reports an error and you need to decode it fast

Why It Matters

Developers spend 35-50% of their time debugging. A significant portion of that time is spent understanding what the error message is telling them — not fixing the actual bug. The faster you decode the message, the faster you fix the problem.

Error Rosetta doesn't fix bugs. It removes the translation step between seeing the error and understanding the error. Everything after that is just typing.

Zero external dependencies. Zero API calls. Pure pattern matching and code analysis.