Santekno/tools
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Go Error Wrapping Helper

Generate idiomatic Go error patterns: fmt.Errorf %w, errors.New, sentinel errors, custom types.

Processed in your browserUpdated · Jan 2026
Context phrase
0 charserr var
Go error snippets
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How to use Go Error Wrapping Helper

Paste your input on the left, choose the options you want, and the output appears instantly on the right. Everything runs in your browser — none of your data is sent to a server.

  • Paste or type your input in the INPUT panel
  • The output regenerates automatically as you type
  • Use Copy to put the result in your clipboard
  • Click Sample to load a working example

What is Go Error Wrapping Helper?

Type a context phrase ("fetching user", "invalid JSON") and get ready-to-paste snippets for all 5 common Go error-handling idioms: wrapped errors with %w (Go 1.13+), simple errors.New, sentinel error declarations, custom error types with Unwrap(), and the full function pattern. Helps maintain consistent error handling across your codebase. This tool is part of santekno's developer toolbox — a curated collection of utilities built for engineers who care about speed, privacy, and simplicity.

Common use cases

  • Debugging API payloads and integration issues
  • Inspecting tokens, hashes, or encoded strings during development
  • Generating fixtures and sample data for tests
  • Sharing readable output with teammates in code reviews

FAQ

Use %w to wrap the original error (preserves it for errors.Is/errors.As). Use %v if you only want the message and don't need to unwrap.