Error Code Sample Generator

What this generator does

Joins a prefix, a number and a description into one code, drawing each independently — so the pairing is illustrative rather than a real system's actual registry, and a description like 'Rate limit exceeded' can land next to any of the prefixes or numbers rather than only the one a real API would use for it.

What it builds, and how many ways

Each result is assembled to this shape: [prefix] + [number] + [description].

• description: 10 options
• number: 10 options
• prefix: 4 options

Taken together those banks can be assembled 400 different ways, repeating after about 25.

Some results it can produce:

• ERR-8815: Rate limit exceeded
• E-6173: Unexpected null value
• APP-ERR-4021: Validation failed
• SVC-2044: Upstream service unavailable

A fixed sample so this page stays the same between visits. Your own results are assembled at random, each slot filled independently and each press independent of the last, so the same result can come up twice — past the repeat figure above, seeing one twice is more likely than not.

How to use this tool

1. Press generate for an error code.
2. Generate again for a different one.

Common use cases

• API documentation examples
• Error-page design mockups
• Test fixtures for error handling

Limitations and good to know

• With 400 possible prefix/number/description combinations in total, a long session comes back round once all 400 have been shown; this is not an unlimited source of distinct codes.

Practical tips

• Keep codes stable once published; clients will match on them, and changing one silently breaks integrations.
• Pair every code with a human-readable message. A code alone helps the API author and nobody else.