diff --git a/javascript/207-canFinish.js b/javascript/207-canFinish.js
new file mode 100644
index 000000000..fe02f1f96
--- /dev/null
+++ b/javascript/207-canFinish.js
@@ -0,0 +1,38 @@
+function createGraph(numCourses, edges) {
+ const graph = Array.from({ length: numCourses }, () => []);
+
+ for (let edge of edges) {
+ let [a, b] = edge;
+
+ if (!(a in graph)) graph[a] = [];
+ if (!(b in graph)) graph[b] = [];
+
+ graph[a].push(b);
+ }
+ return graph;
+}
+
+function canFinish(numCourses, preq) {
+ const graph = createGraph(numCourses, preq);
+ let seen = new Set();
+ let seeing = new Set();
+
+ function explore(course) {
+ if (seen.has(course)) return true;
+ if (seeing.has(course)) return false;
+
+ seeing.add(course);
+ for (let neighbor of graph[course]) {
+ if (!explore(neighbor)) return false;
+ }
+
+ seen.add(course);
+ seeing.delete(course);
+ return true;
+ }
+
+ for (let i = 0; i < numCourses; i++) {
+ if (!explore(i)) return false;
+ }
+ return true;
+};
\ No newline at end of file
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