diff --git a/.gitignore b/.gitignore
index d2143e4..68bc17f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,9 +3,6 @@ __pycache__/
 *.py[cod]
 *$py.class
 
-# Test data
-data
-
 # C extensions
 *.so
 
diff --git a/app.py b/app.py
index 6372e53..31dfa10 100644
--- a/app.py
+++ b/app.py
@@ -1,27 +1,21 @@
 from shiny import App, reactive, ui
 import scanpy as sc
-import os
 import pickle
-import scHPL
+import json
 
 from composition import composition_server, composition_ui
 from export import export_ui, export_server
 from dgea.dgea import dgea_server, dgea_ui
 from tree import tree_server, tree_ui
 
-with open("data/input.txt") as f:
-    file_list = f.readlines()
-    filename = "data/" + file_list[0].strip()
-    treename = "data/" + file_list[1].strip()
-    name = file_list[2].strip()
+with open("data/config.json") as f:
+    config = json.load(f)
+    adata = sc.read_h5ad("data/" + config["adata"])
+    tree = pickle.load(open("data/" + config["tree"], "rb"))
+    name = config["name"]
 
-
-adata = sc.read_h5ad(filename)
 categorical_columns = adata.obs.select_dtypes(include="category").columns.to_list()
 
-tree = pickle.load(open(treename, "rb"))
-
-
 app_ui = ui.page_navbar(
     ui.nav_panel("Composition analysis",
                  composition_ui("composition")
diff --git a/data/config.json b/data/config.json
new file mode 100644
index 0000000..f5d0142
--- /dev/null
+++ b/data/config.json
@@ -0,0 +1,5 @@
+{
+    "adata": "merged.h5ad",
+    "tree": "scarches.tree.pkl",
+    "name": "possible_atlas"
+}
\ No newline at end of file
diff --git a/data/input.txt b/data/input.txt
deleted file mode 100644
index badd1aa..0000000
--- a/data/input.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-merged.h5ad
-scarches.tree.pkl
-possible_atlas
\ No newline at end of file
diff --git a/data/scarches.tree.pkl b/data/scarches.tree.pkl
new file mode 100644
index 0000000..da201a8
Binary files /dev/null and b/data/scarches.tree.pkl differ