diff --git a/app/constants.py b/app/constants.py
new file mode 100644
index 0000000..9d13124
--- /dev/null
+++ b/app/constants.py
@@ -0,0 +1,6 @@
+datasets = [
+    "coronavirus-commercants-parisiens-livraison-a-domicile"
+    "deconfinement-pistes-cyclables-temporaires"
+    "deconfinement-paking-relais-doublement-des-places"
+]
+url = "https://opendata.paris.fr/api/v2/catalog/datasets/{}/exports/json?rows=-1&pretty=false&timezone=UTC"
diff --git a/app/request_datasets.py b/app/request_datasets.py
index 5875ffe..38e85d8 100644
--- a/app/request_datasets.py
+++ b/app/request_datasets.py
@@ -1,3 +1,4 @@
+from constants import datasets, url
 from requests import get
 from json import dump
 
@@ -9,14 +10,12 @@ def save_json(data):
 
 def request_dataset(url):
     request = get(url)
-    response = request.json()
-    response.dump()
+    data = request.json()
+    save_json(data)
 
 
 def main():
-    url = "https://opendata.paris.fr/api/v2/catalog/datasets/{}/exports/json?rows=-1&pretty=false&timezone=UTC".format(
-        "deconfinement-pistes-cyclables-temporaires"
-    )
+    url.format("deconfinement-pistes-cyclables-temporaires")
 
 
 if __name__ == "__main__":