diff --git a/app/data/zadanie01/sum.txt b/app/data/zadanie01/sum.txt
index e69de29..615088b 100644
--- a/app/data/zadanie01/sum.txt
+++ b/app/data/zadanie01/sum.txt
@@ -0,0 +1 @@
+108
\ No newline at end of file
diff --git a/app/data/zadanie02/data.json b/app/data/zadanie02/data.json
index 5797172..def41a8 100644
--- a/app/data/zadanie02/data.json
+++ b/app/data/zadanie02/data.json
@@ -1,4 +1,4 @@
-{
-  "data" : "Nie musisz rozkodowywać tego JSONa!",
-  "example" : "To tylko przykład :)"
+{
+  "data" : "Nie musisz rozkodowywać tego JSONa!",
+  "example" : "To tylko przykład :)"
 }
\ No newline at end of file
diff --git a/app/data/zadanieDnia/test.txt b/app/data/zadanieDnia/test.txt
index 47c17e3..4a8e5b0 100644
--- a/app/data/zadanieDnia/test.txt
+++ b/app/data/zadanieDnia/test.txt
@@ -1,7 +1,8 @@
-You Don't Know JS: ES6 & Beyond
-Foreword
-
-Kyle Simpson is a thorough pragmatist.
-
-I can't think of higher praise than this. To me, these are two of the most important qualities that a software developer must have. That's right: must, not should. Kyle's keen ability to tease apart layers of the JavaScript programming language and present them in understandable and meaningful portions is second to none.
-[https://github.com/getify/You-Dont-Know-JS/blob/master/es6%20%26%20beyond/foreword.md]
\ No newline at end of file
+yOu dOn't kNoW Js: Es6 & BeYoNd
+FoReWoRd
+
+KyLe sImPsOn iS A ThOrOuGh pRaGmAtIsT.
+
+I CaN'T ThInK Of hIgHeR PrAiSe tHaN ThIs. To mE, tHeSe aRe tWo oF ThE MoSt iMpOrTaNt qUaLiTiEs tHaT A SoFtWaRe dEvElOpEr mUsT HaVe. ThAt's rIgHt: MuSt, NoT ShOuLd. KyLe's kE
+eN AbIlItY To tEaSe aPaRt lAyErS Of tHe jAvAsCrIpT PrOgRaMmInG LaNgUaGe aNd pReSeNt tHeM In uNdErStAnDaBlE AnD MeAnInGfUl pOrTiOnS Is sEcOnD To nOnE.
+[hTtPs://gItHuB.CoM/GeTiFy/yOu-dOnT-KnOw-jS/BlOb/mAsTeR/Es6%20%26%20BeYoNd/fOrEwOrD.Md]
diff --git a/app/zadanie01.js b/app/zadanie01.js
index 8c20173..033113f 100644
--- a/app/zadanie01.js
+++ b/app/zadanie01.js
@@ -1 +1,17 @@
-//Twój kod
\ No newline at end of file
+//Twój kod
+
+const fs = require("fs");
+
+fs.readFile('./data/zadanie01/input.json', (err, data) => {
+    if (err === null) {
+        let sum = JSON.parse(data).reduce((a,b)=>{return a+b;});
+        fs.writeFile('./data/zadanie01/sum.txt',sum, err => {
+            if (err===null){
+                console.log("Zapisano popranie!")
+            } else
+                console.log("Blad zapisu!")
+        })
+    } else
+        console.log('Blad odczytu')
+
+});
\ No newline at end of file
diff --git a/app/zadanie02.js b/app/zadanie02.js
index 8c20173..5af500f 100644
--- a/app/zadanie02.js
+++ b/app/zadanie02.js
@@ -1 +1,12 @@
-//Twój kod
\ No newline at end of file
+//Twój kod
+
+const fs = require("fs");
+
+fs.readdir('./data/zadanie02',(err,files)=>{
+    if(err===null){
+        files.forEach(file =>{
+            console.log(file);
+        })
+    } else
+        console.log('Blad odczytu!')
+});
\ No newline at end of file
diff --git a/app/zadanieDnia.js b/app/zadanieDnia.js
index 8c20173..8b32d21 100644
--- a/app/zadanieDnia.js
+++ b/app/zadanieDnia.js
@@ -1 +1,24 @@
-//Twój kod
\ No newline at end of file
+//Twój kodc
+const fs = require('fs');
+const nazwa = process.argv[2];
+
+let parse = (el,i)=>{
+    if(i % 2 !== 0){
+        return el.toUpperCase();
+    }else{
+        return el.toLowerCase();
+    }
+};
+
+fs.readFile(nazwa, 'utf-8',(err, data )=> {
+    if (err===null){
+        let arr = data.split('').map(parse).join('');
+        fs.writeFile(nazwa, arr ,er=>{
+            if (er === null){
+                console.log('Udane!');
+            } else
+            console.log('Blad odczytu!');
+        })
+    } else
+        console.log('Blad odczytu' + err );
+});
\ No newline at end of file