diff --git a/README.md b/README.md
new file mode 100644
index 0000000..b330d78
--- /dev/null
+++ b/README.md
@@ -0,0 +1,18 @@
+# Advent of Code
+
+Hi all!
+
+My AdventOfCode is `node.js` based. 
+
+To run any day, type `node index.js <day#>` and it will execute the day you inputted. Make sure you fill the relevant `input.txt` file with the input for that day if you want to see your own code.
+
+The current main branch is 2021, but my code from last year is also available in branch 2020. I didn't get further than day 10 yet though. 
+
+
+For 2020: Step into each day folder and run `node program.js` to run it. 
+
+In any solution you can replace my input.txt with your content and see if it works for yours as well.
+
+I am always curious to better solutions, so feel free to PR on an existing day any improvements to the code. As long as they're actually improvements, not just for the sake of shorter. My code should be production-deployable (in my mind) so they should be easily readable.
+
+For this purpose, also read [my article about 1-liners](https://javascript.plainenglish.io/we-need-to-talk-about-the-one-liners-58f460c05fc5?source=friends_link&sk=102a7a363db7988174bfb87666f63ecb). I would say I prefer longer code as long as it is readable. If something can be faster, then of course it should be.
diff --git a/day1.js b/day1.js
deleted file mode 100644
index c874e4f..0000000
--- a/day1.js
+++ /dev/null
@@ -1,37 +0,0 @@
-const fs = require('fs');
-
-function findSumPart2(nums) {
-    nums.forEach(num => {
-        nums.forEach(num2 => {
-            nums.forEach(num3 => {
-                if (num + num2 + num3 === 2020) {
-                    console.log('2: found match', num, num2, num3, num*num2*num3);
-                }
-            });
-        });
-            
-    });
-}
-
-function findSumPart1(nums) {
-    nums.forEach(num => {
-        nums.forEach(num2 => {
-            if (num + num2 === 2020) {
-                console.log('1: found match', num, num2, num*num2);
-            }
-        });
-            
-    });
-}
-
-fs.readFile('./day1input.txt', 'utf-8', (e, data) =>{
-    const items = data.split("\n");
-    items.forEach((num, i) => {
-        items[i] = parseInt(num);
-    })
-    findSumPart1(items);
-    findSumPart2(items);
-})
-
-
-
diff --git a/day1/input.txt b/day1/input.txt
new file mode 100644
index 0000000..b6b18e5
--- /dev/null
+++ b/day1/input.txt
@@ -0,0 +1,2000 @@
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\ No newline at end of file
diff --git a/day1/program.js b/day1/program.js
new file mode 100644
index 0000000..cd64cae
--- /dev/null
+++ b/day1/program.js
@@ -0,0 +1,44 @@
+export default function Day(data) {
+    let increases = 0;
+    let lastValue = false;
+
+    // prepare data
+    data.forEach((row, i) => {
+        data[i] = parseInt(row);
+    });
+
+    // part 1
+    data.forEach((row) => {
+        if (lastValue !== false && row > lastValue) {
+            increases++;
+        }
+
+        lastValue = row;
+    });
+
+    console.log("Part 1:", increases);
+
+    // part 2
+    let rollingThrees = [];
+    let lastSum = false;
+    let increases2 = 0;
+
+    data.forEach((row, i) => {
+        rollingThrees.push(row);
+
+        if (rollingThrees.length > 3) {
+            rollingThrees.shift();
+        }
+        if (rollingThrees.length === 3) {
+            const sum = rollingThrees.reduce((a, b) => a + b);
+
+            if (lastSum !== false && sum > lastSum) {
+                increases2++;
+            }
+
+            lastSum = sum;
+        }
+    });
+
+    console.log("Part 2:", increases2);
+}
diff --git a/day1input.txt b/day1input.txt
deleted file mode 100644
index ea74611..0000000
--- a/day1input.txt
+++ /dev/null
@@ -1,200 +0,0 @@
-1918
-1869
-1821
-1852
-1981
-1987
-1989
-1597
-1634
-1537
-1991
-1603
-1543
-1949
-1879
-1800
-1761
-2010
-1810
-1458
-1755
-1938
-1500
-2005
-818
-1493
-1618
-1923
-1283
-1952
-1373
-1605
-1230
-1321
-1873
-1853
-1886
-1372
-1913
-1871
-159
-733
-1400
-1880
-1462
-2007
-1801
-1982
-1728
-1640
-1442
-1525
-1953
-1791
-1906
-1946
-1641
-2009
-1627
-1935
-1936
-1908
-1826
-1291
-1978
-1884
-1799
-1464
-1538
-1365
-1678
-1872
-1964
-1863
-1388
-1912
-1928
-1471
-1632
-1336
-1396
-1948
-1974
-1331
-1290
-1992
-1096
-1889
-1874
-1341
-757
-1351
-1876
-1674
-2002
-1504
-1865
-1469
-1792
-1920
-1925
-1898
-1899
-1435
-405
-1488
-1319
-1322
-1749
-1867
-1957
-1944
-1727
-1293
-1739
-1285
-1917
-1897
-1844
-1966
-1921
-1905
-1830
-1484
-1364
-1782
-1415
-1412
-1413
-833
-1857
-1370
-1890
-1393
-1262
-1311
-2008
-1545
-1896
-1362
-1862
-1617
-1864
-608
-1868
-1689
-1784
-1806
-1976
-1870
-1973
-1993
-1986
-1998
-1414
-1858
-1990
-1841
-1895
-1779
-1850
-2001
-1590
-1902
-1487
-943
-1808
-782
-1546
-2004
-1656
-154
-1661
-1688
-1731
-1466
-1927
-1438
-1387
-1576
-1793
-1797
-1979
-1903
-1638
-1940
-1911
-1301
-1669
-1409
-1578
-1887
-1860
-1619
-1939
-1625
-1941
-1374
-1766
-1407
\ No newline at end of file
diff --git a/day2.js b/day2.js
deleted file mode 100644
index e135497..0000000
--- a/day2.js
+++ /dev/null
@@ -1,68 +0,0 @@
-const fs = require('fs');
-
-function split(item) {
-    let parts = item.split(" ");
-    if (parts.length < 2) return false;
-    parts[0] = parts[0].split('-');
-
-    parts[0][0] = parseInt(parts[0][0]);
-    parts[0][1] = parseInt(parts[0][1]);
-    return parts;
-}
-
-function isValidPart1(item) {
-    const parts = split(item);
-    if (!parts) return;
-
-    const char = parts[1].substr(0,1);
-    const regex = new RegExp(char, 'g');
-    const matches = parts[2].match(regex);
-
-    if (matches && matches.length >= parts[0][0] && matches.length <= parts[0][1]) {
-        return true;
-    }
-    return false;
-   
-}
-
-
-function isValidPart2(item) {
-    const parts = split(item);
-    if (!parts) return;
-    
-    const char = parts[1].substr(0,1);
-    const pw = parts[2];
-
-    const char1 = pw.substr(parts[0][0] - 1, 1);
-    const char2 = pw.substr(parts[0][1] - 1, 1);
-
-    if (char1 === char2) return false;
-    if (char1 === char || char2 === char) return true;
-
-    return false;
-
-}
-
-function parseItems(input) {
-    let validItems1 = 0;
-    let validItems2 = 0;
-    
-    input.forEach(item => {
-        if (isValidPart1(item)) {
-            validItems1++;
-        }
-        if (isValidPart2(item)){
-            validItems2++;
-        }
-    });
-
-    console.log('part 1: found valid items: ', validItems1);
-    console.log('part 2: found valid items: ', validItems2);
-}
-
-
-fs.readFile('./day2input.txt', 'utf-8', (e, data) =>{
-    const items = data.split("\n");
-
-    const pws = parseItems(items);
-})
\ No newline at end of file
diff --git a/day2/input.txt b/day2/input.txt
new file mode 100644
index 0000000..cde6bfc
--- /dev/null
+++ b/day2/input.txt
@@ -0,0 +1,1000 @@
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\ No newline at end of file
diff --git a/day2/program.js b/day2/program.js
new file mode 100644
index 0000000..7362019
--- /dev/null
+++ b/day2/program.js
@@ -0,0 +1,52 @@
+export default function Day(data) {
+    const instructions = data.map((instruction) => {
+        const instructionSplit = instruction.split(" ");
+        instructionSplit[1] = parseInt(instructionSplit[1]);
+        return instructionSplit;
+    });
+
+    part1(instructions);
+    part2(instructions);
+}
+
+const part1 = (instructions) => {
+    let position = 0;
+    let depth = 0;
+
+    for (const instruction of instructions) {
+        switch (instruction[0]) {
+            case "up":
+                depth -= instruction[1];
+                break;
+            case "down":
+                depth += instruction[1];
+                break;
+            case "forward":
+                position += instruction[1];
+                break;
+        }
+    }
+    console.log(`Part 1: position: ${position}, depth: ${depth}`, position * depth);
+};
+
+const part2 = (instructions) => {
+    let position = 0;
+    let depth = 0;
+    let aim = 0;
+
+    for (const instruction of instructions) {
+        switch (instruction[0]) {
+            case "up":
+                aim -= instruction[1];
+                break;
+            case "down":
+                aim += instruction[1];
+                break;
+            case "forward":
+                position += instruction[1];
+                depth += aim * instruction[1];
+                break;
+        }
+    }
+    console.log(`Part 2: position: ${position}, depth: ${depth}, aim: ${aim}`, position * depth);
+};
diff --git a/day2input.txt b/day2input.txt
deleted file mode 100644
index f7a1314..0000000
--- a/day2input.txt
+++ /dev/null
@@ -1,1000 +0,0 @@
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-5-6 p: hpzplphxb
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-1-6 k: kkkkkk
-1-3 q: qqqq
-4-8 t: pctpfqtrtttmvptvfmws
-3-5 z: zznzslv
-12-14 h: hhhhhhhhhhhhhhhh
-14-15 v: vvvvvvvvhvvvvdmvv
-8-17 x: xxxxxxdxxxxxxxckxx
-11-12 f: gkfjnffjfcmfwk
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-2-8 d: qnqtrqdrnvq
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-1-2 f: sfffffffffffffffff
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-2-3 r: qzbgrghkmlpxdvd
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-3-4 c: ccbpccccczpcccc
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-1-5 q: ltqqqxcndqrq
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diff --git a/day3/input.txt b/day3/input.txt
new file mode 100644
index 0000000..fac471c
--- /dev/null
+++ b/day3/input.txt
@@ -0,0 +1,1000 @@
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\ No newline at end of file
diff --git a/day3/program.js b/day3/program.js
new file mode 100644
index 0000000..a1e0658
--- /dev/null
+++ b/day3/program.js
@@ -0,0 +1,64 @@
+export default function Day(data) {
+    const bitCount = bitValues(data);
+    part1(data, bitCount);
+    part2(data, bitCount);
+}
+
+const part1 = (instructions, count) => {
+    let gamma = "";
+    let epsilon = "";
+
+    for (const row in count) {
+        gamma += count[row]["0"] > count[row]["1"] ? "0" : "1";
+        epsilon += count[row]["0"] > count[row]["1"] ? "1" : "0";
+    }
+
+    console.log("part 1", gamma, epsilon, parseInt(gamma, 2) * parseInt(epsilon, 2));
+};
+
+const part2 = (instructions, count) => {
+    function removeBasedOnBitPosition(rows, bitPosition, value) {
+        return rows.filter((row) => row.substr(bitPosition, 1) !== value);
+    }
+
+    function removeFromArray(rows, invert) {
+        let result;
+        for (const bitRow in count) {
+            count = bitValues(rows);
+
+            const bit = count[bitRow];
+            let check = bit["0"] > bit["1"];
+            if (invert) check = !check;
+
+            rows = removeBasedOnBitPosition(rows, parseInt(bitRow), check ? "0" : "1");
+
+            if (rows.length === 1) {
+                result = rows[0];
+                break;
+            }
+        }
+        return result;
+    }
+
+    const oxygen = removeFromArray(instructions, false);
+    const co2 = removeFromArray(instructions, true);
+
+    console.log("part 2", oxygen, co2, parseInt(oxygen, 2) * parseInt(co2, 2));
+};
+
+const bitValues = (instructions) => {
+    let count = {};
+
+    for (const binary of instructions) {
+        const nums = binary.split("");
+
+        nums.forEach((element, i) => {
+            if (!count.hasOwnProperty(i)) {
+                count[i] = { 0: 0, 1: 0 };
+            }
+            count[i][element]++;
+        });
+    }
+
+    return count;
+};
diff --git a/helper.js b/helper.js
new file mode 100644
index 0000000..77d3fbe
--- /dev/null
+++ b/helper.js
@@ -0,0 +1,15 @@
+import fs from "fs";
+
+export default async function loadData(day) {
+    const data = await fs.readFileSync(`./${day}/input.txt`, "utf-8");
+    return data.split("\n");
+}
+
+export async function fileExists(filename) {
+    try {
+        const result = await fs.existsSync(filename);
+        return result;
+    } catch (err) {
+        return false;
+    }
+}
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..8d9011a
--- /dev/null
+++ b/index.js
@@ -0,0 +1,30 @@
+import loadData, { fileExists } from "./helper.js";
+
+if (process.argv[2]) {
+    try {
+        const dayName = `day${process.argv[2]}`;
+        const filename = `./${dayName}/program.js`;
+
+        if (await fileExists(filename)) {
+            console.log("found", filename);
+            const data = await loadData(dayName);
+            const { default: Day } = await import(filename);
+
+            console.time("Day Execution");
+            Day(data);
+            console.timeEnd("Day Execution");
+        } else {
+            console.log("The provided day does not exist or is not yet implemented");
+        }
+    } catch (e) {
+        console.log(e);
+        error();
+    }
+} else {
+    error();
+    process.exit(1);
+}
+
+function error() {
+    console.log('Please specify a day as a number like "node index.js 1"');
+}
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..3835808
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,6 @@
+{
+  "name": "adventofcode",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {}
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..97fb847
--- /dev/null
+++ b/package.json
@@ -0,0 +1,20 @@
+{
+    "name": "adventofcode",
+    "version": "1.0.0",
+    "description": "Hi all!",
+    "main": "helper.js",
+    "scripts": {
+        "test": "echo \"Error: no test specified\" && exit 1"
+    },
+    "repository": {
+        "type": "git",
+        "url": "git+https://github.com/Topener/adventofcode.git"
+    },
+    "author": "",
+    "license": "ISC",
+    "bugs": {
+        "url": "https://github.com/Topener/adventofcode/issues"
+    },
+    "homepage": "https://github.com/Topener/adventofcode#readme",
+    "type": "module"
+}