If Go is installed, it's simple to try it out:
$ go install github.com/BurntSushi/toml/cmd/tomlv@master
$ tomlv some-toml-file.toml
You can see the types of every key in a TOML file with:
$ tomlv -types some-toml-file.toml
At the moment, only one error message is reported at a time. Error messages
include line numbers. No output means that the files given are valid TOML, or
there is a bug in tomlv.