Is there a way to list all the available snippets?

[navxio]

for the given file type of course

[felixr]

Have a look at

vim-vsnip/autoload/vsnip.vim

Lines 128 to 144 in b05641c

	let l:sources = vsnip#source#find(bufnr('%'))
	" Search prefix
	for l:source in l:sources
	for l:snippet in l:source
	for l:prefix in l:snippet.prefix
	let l:prefix_len = strchars(l:prefix)
	if strcharpart(l:before_text, l:before_text_len - l:prefix_len, l:prefix_len) !=# l:prefix
	continue
	endif
	if l:prefix =~# '^\h' && l:before_text !~# '\<\V' . escape(l:prefix, '\/?') . '\m$'
	continue
	endif
	return s:create_context(l:snippet, l:before_text_len, l:prefix_len)
	endfor
	endfor
	endfor

The code calls vsnip#source#find(bufnr('%')) to get all snippets from all sources for the current buffer (`bufnr('%')). It returns a list of list of snipped (ie [ [ snip, snip], [snip, ...] ]) and each snippet is a dictionary matching the JSON