diff --git a/after/ftplugin/json.vim b/after/ftplugin/json.vim
new file mode 100644
index 0000000..3f08013
--- /dev/null
+++ b/after/ftplugin/json.vim
@@ -0,0 +1,24 @@
+" Set custom fold expression
+setlocal foldmethod=expr
+setlocal foldexpr=JsonFold(v:lnum)
+
+" Custom fold function
+function! JsonFold(lnum)
+  let l:line = getline(a:lnum)
+
+  if l:line =~ '{' && l:line !~ '}' && l:line !~ '".*{.*"'
+    return 'a1'
+  elseif l:line =~ '[' && l:line !~ ']' && l:line !~ '".*].*"'
+    return 'a1'
+  elseif l:line =~ '}' && l:line !~ '{' && l:line !~ '".*}.*"'
+    return 's1'
+  elseif l:line =~ ']' && l:line !~ '[' && l:line !~ '".*[.*"'
+    return 's1'
+  endif
+
+  return '='
+endfunction
+
+" Override default group names
+hi link jsonQuote Operator
+hi link jsonKeyword Keyword