diff --git a/13/input b/13/input
new file mode 100644
index 0000000..0d60fbd
--- /dev/null
+++ b/13/input
@@ -0,0 +1,449 @@
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+[[3,1,[10,[7,1,4,8,6],[1,1,3],[5,1,6,3,8]],6],[3,8,[[4,1,4,5],[1,8,1],[],[5,10,9,2,7]],3,7],[10,0,8,6]]
+[[],[5,8,9,7,[6,2]],[7,[3,0,1,[]],[]]]
diff --git a/13/solution.mjs b/13/solution.mjs
new file mode 100644
index 0000000..56388fe
--- /dev/null
+++ b/13/solution.mjs
@@ -0,0 +1,53 @@
+import { readFileSync } from 'node:fs';
+
+const input = readFileSync('input', 'utf-8');
+
+const pairs = input
+  .split('\n\n')
+  .map(pair => pair
+    .split('\n')
+    .filter(line => line)
+    .map(line => JSON.parse(line))
+  );
+
+export function compare(left, right) {
+  const leftIsArray = Array.isArray(left);
+  const rightIsArray = Array.isArray(right);
+  const compareArrays = leftIsArray || rightIsArray;
+  if (leftIsArray && !rightIsArray) {
+    right = [right];
+  }
+  if (rightIsArray && !leftIsArray) {
+    left = [left];
+  }
+
+  if (compareArrays) {
+    for (let i = 0; i < Math.max(left.length, right.length); i++) {
+      if (i >= left.length) return -1;
+      if (i >= right.length) return 1;
+      
+      const result = compare(left[i], right[i]);
+      if (result !== 0) return result;
+    }
+    return 0;
+  } else {
+    return (left - right) / Math.abs(left - right || 1);
+  }
+}
+
+const sumOfIndices = pairs
+  .map(([left, right], i) => [i + 1, compare(left, right)])
+  .filter(([_index, result]) => result === -1)
+  .reduce((total, [index, _result]) => total + index, 0);
+
+console.log(`Sum of correctly ordered inices: ${sumOfIndices}`);
+
+const dividerPackets = [[[2]], [[6]]];
+const allPackets = [...pairs.flat(), ...dividerPackets];
+allPackets.sort(compare);
+
+const decoderKey = dividerPackets
+  .map(packet => allPackets.indexOf(packet) + 1)
+  .reduce((total, index) => total * index);
+
+console.log(`Decoder key: ${decoderKey}`);