diff --git a/syringe.cpp b/syringe.cpp
index bdcc642af36c859f9c4279901fa970683f8fae12..21e2df579a70a3f67a53e6616f55cb5179fc0744 100644
--- a/syringe.cpp
+++ b/syringe.cpp
@@ -98,8 +98,10 @@ void Syringe :: write_Json ()
 {
 InterruptLock lock; //useful thanks to its constructor (so a is not visible in the code)
 File f = filesystem->open("syringe_json", "w"); //Creation du fichier
-serializeJson(syringe_json, f); //remettre f a la plce de json
-  
+size_t a = serializeJson(syringe_json, f); //remettre f a la plce de json
+Serial.println("Taille de syringe_json");
+Serial.println(a);
+f.close();
 }
 
 //useful in setup of pousse-seringue.cpp(to check at the begining what has already been saved) and web.cpp via a button to recover data
diff --git a/syringefilled.cpp b/syringefilled.cpp
index 0e6a3da0739bb157d595f4f88cfeb4b2ad26731b..aeaeacb69e0feac9dd6453865e8dae515efb0543 100644
--- a/syringefilled.cpp
+++ b/syringefilled.cpp
@@ -336,8 +336,10 @@ void SyringeFilled :: write_Json ()
 {
 InterruptLock lock; //useful thanks to its constructor (so a is not visible in the code)
 File f = filesystem->open("syringe_filled_json", "w"); //Creation du fichier
-serializeJson(syringe_filled_json, f);
-  
+size_t a = serializeJson(syringe_filled_json, f);
+Serial.println("Taille de syringe_filled_json");
+Serial.println(a);
+f.close();
 }
 
 //useful in setup of pousse-seringue.cpp(to check at the begining what has already been saved) and web.cpp via a button to recover data