Support fixing JSON files with fixjson

autoload/ale/fixers/fixjson.vim

@@ -0,0 +1,20 @@
+" Author: rhysd <https://rhysd.github.io>
+" Description: Integration of fixjson with ALE.
+
+call ale#Set('json_fixjson_executable', 'fixjson')
+call ale#Set('json_fixjson_options', '')
+
+function! ale#fixers#fixjson#Fix(buffer) abort
+    let l:executable = ale#Escape(ale#Var(a:buffer, 'json_fixjson_executable'))
+    let l:filename = ale#Escape(bufname(a:buffer))
+    let l:command = l:executable . ' --stdin-filename ' . l:filename
+
+    let l:options = ale#Var(a:buffer, 'json_fixjson_options')
+    if l:options isnot# ''
+        let l:command .= ' ' . l:options
+    endif
+
+    return {
+    \   'command': l:command
+    \}
+endfunction