RSpec multiple formats with different out buffers

On RSpec there is a way to use multiple formatters from the command line and pipe each into a different output buffer (file/stdout).

To do this use rspec -f p -f j --out result.json spec

-f is alias for --format which takes the arguments

[p]rogress (default - dots)
[d]ocumentation (group and example names)
[h]tml
[j]son

--out will save the last formatter mentioned to a file.

The original formatter will print to $stdout so you end up having the normal display from RSpec and a JSON file which you can use to parse with your own script.

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