diff --git a/aider/coder.py b/aider/coder.py
index 6778f5729..1f8dcd303 100755
--- a/aider/coder.py
+++ b/aider/coder.py
@@ -171,7 +171,7 @@ class Coder:
 
         if self.repo is not None:
             other_files = set(self.get_all_abs_files()) - set(self.abs_fnames)
-            if other_files and len(other_files) < 100:
+            if other_files and len(other_files) < 1000:
                 if self.use_ctags:
                     files_listing = get_tags_map(other_files)
                     ctags_msg = " with selected ctags content"
diff --git a/aider/ctags.py b/aider/ctags.py
index 3d06876e9..983bbd11e 100644
--- a/aider/ctags.py
+++ b/aider/ctags.py
@@ -15,7 +15,7 @@ def get_tags_map(filenames, root_dname=None):
 
     tags = []
     for filename in filenames:
-        if filename.endswith(".md"):
+        if filename.endswith(".md") or filename.endswith(".json"):
             continue
         tags += get_tags(filename, root_dname)
     if not tags: