diff --git a/.gitignore b/.gitignore
index ca48f09..2a025c1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
-*.json
+profile.json
 .vscode/
 export/
 cache/
diff --git a/deno.json b/deno.json
new file mode 100644
index 0000000..7086295
--- /dev/null
+++ b/deno.json
@@ -0,0 +1,19 @@
+{
+  "tasks": {
+    "check": "deno check s3si.ts",
+    "fmt": "deno fmt",
+    "fmt:check": "deno fmt --check",
+    "lint": "deno lint",
+    "run": "deno run -A"
+  },
+  "fmt": {
+    "files": {
+      "exclude": [
+        "export/",
+        "cache/",
+        ".vscode/",
+        "profile.json"
+      ]
+    }
+  }
+}
diff --git a/scripts/find-id.ts b/scripts/find-id.ts
new file mode 100644
index 0000000..3255a30
--- /dev/null
+++ b/scripts/find-id.ts
@@ -0,0 +1,33 @@
+import { base64 } from "../deps.ts";
+import { FileExporterType } from "../src/exporters/file.ts";
+
+const dirs = Deno.args;
+
+const files: string[] = [];
+
+for (const dir of dirs) {
+  for await (const entry of Deno.readDir(dir)) {
+    if (entry.isFile) {
+      files.push(`${dir}/${entry.name}`);
+    }
+  }
+}
+
+const ids = new Map<string, string>();
+
+for (const file of files) {
+  try {
+    const content: FileExporterType = JSON.parse(await Deno.readTextFile(file));
+    const id = content.data.detail.id;
+    const rawId = base64.decode(id);
+    const uuid = new TextDecoder().decode(rawId.slice(rawId.length - 36));
+    if (ids.has(uuid)) {
+      console.log(
+        `Duplicate: ${uuid}:${id} in ${file} and ${uuid}:${ids.get(uuid)}`,
+      );
+    }
+    ids.set(uuid, id);
+  } catch (e) {
+    console.log("Failed to process file", file, e);
+  }
+}
diff --git a/src/exporters/file.ts b/src/exporters/file.ts
index eff1b1f..c6f96d9 100644
--- a/src/exporters/file.ts
+++ b/src/exporters/file.ts
@@ -2,7 +2,7 @@ import { BattleExporter, VsBattle } from "../types.ts";
 import { base64, path } from "../../deps.ts";
 import { NSOAPP_VERSION, S3SI_VERSION } from "../constant.ts";
 
-type FileExporterType = {
+export type FileExporterType = {
   type: "VS" | "COOP";
   nsoVersion: string;
   s3siVersion: string;