I've also added Janet support to nvim-paredit [0] and use a combination of that, conjure [1], and nvim-parinfer to get a really slick editing experience in neovim.

[0]: https://github.com/julienvincent/nvim-paredit

[1]: https://github.com/julienvincent/nvim-paredit

[2]: https://github.com/olical/conjure

Oops, I really messed up those links:

[0]: https://github.com/julienvincent/nvim-paredit

[1]: https://github.com/olical/conjure

[2]: https://github.com/gpanders/nvim-parinfer