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50 lines
1.5 KiB
Markdown
50 lines
1.5 KiB
Markdown
# Error Messages
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All exceptions thrown in router creation are caught, formatted and rethrown by the `reitit.core/router` function. Exception formatting is done by the exception formatter defined by the `:exception` router option.
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## Default Errors
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The default exception formatting uses `reitit.exception/exception`. It produces single-color, partly human-readable, error messages.
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```clj
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(require '[reitit.core :as r])
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(r/router
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[["/ping"]
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["/:user-id/orders"]
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["/bulk/:bulk-id"]
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["/public/*path"]
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["/:version/status"]])
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```
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## Pretty Errors
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```clj
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[metosin/reitit-dev "0.3.4"]
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```
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For human-readable and developer-friendly exception messages, there is `reitit.dev.pretty/exception` (in the `reitit-dev` module). It is inspired by the lovely errors messages of [ELM](https://elm-lang.org/blog/compiler-errors-for-humans) and [ETA](https://twitter.com/jyothsnasrin/status/1037703436043603968) and uses [fipp](https://github.com/brandonbloom/fipp), [expound](https://github.com/bhb/expound) and [spell-spec](https://github.com/bhauman/spell-spec) for most of heavy lifting.
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```clj
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(require '[reitit.dev.pretty :as pretty])
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(r/router
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[["/ping"]
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["/:user-id/orders"]
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["/bulk/:bulk-id"]
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["/public/*path"]
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["/:version/status"]]
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{:exception pretty/exception})
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```
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## Extending
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Behind the scenes, both error formatters are backed by a multimethod, so they are easy to extend.
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## More examples
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See the [validating route data](route_data_validation.md) page.
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