diff --git a/src/cli.ts b/src/cli.ts
index a811bcc..5db304e 100755
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -51,11 +51,17 @@ program
 program
   .command("list")
   .description("Show all active sessions")
-  .action(async () => {
+  .option("--json", "Output as JSON")
+  .action(async (opts: { json?: boolean }) => {
     const root = await git.repoRoot()
     const st = await state.load(root)
     const sessions = Object.values(st.sessions)
 
+    if (opts.json) {
+      console.log(JSON.stringify(sessions, null, 2))
+      return
+    }
+
     if (sessions.length === 0) {
       console.log("No active sessions.")
       return