diff --git a/.prettierrc.json b/.prettierrc.json
new file mode 100644
index 0000000..ddab9bf
--- /dev/null
+++ b/.prettierrc.json
@@ -0,0 +1,11 @@
+{
+  "trailingComma": "es5",
+  "arrowParens": "always",
+  "tabWidth": 2,
+  "useTabs": false,
+  "semi": true,
+  "singleQuote": true,
+  "jsxSingleQuote": true,
+  "printWidth": 100,
+  "proseWrap": "always"
+}
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..f0b6ff6
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,4 @@
+{
+  "editor.rulers": [100],
+  "editor.formatOnSave": true
+}
diff --git a/index.ts b/index.ts
index 7f0283f..6304c17 100644
--- a/index.ts
+++ b/index.ts
@@ -61,12 +61,19 @@ type RPCError = {
 // the spec exposes under a consolidated name with no single legacy equivalent, e.g. "beach", plus
 // a few one-off spec/backend naming or shape mismatches). Update this file directly as gaps are
 // found through testing.
-const namedArgumentMapper: Record<MethodRef, Argument[]> = argumentMap.positional as Record<MethodRef, Argument[]>;
+const namedArgumentMapper: Record<MethodRef, Argument[]> = argumentMap.positional as Record<
+  MethodRef,
+  Argument[]
+>;
 
 // RPC methods whose Perl implementation already takes a single hashref/hash of named arguments.
 // Two versions of this are needed because sometimes named arguments are [{ args }] or { args } depending on context
-const namedOnlyFirstPositionSet: Set<MethodRef> = new Set(argumentMap.namedOnlyFirstPosition as MethodRef[]);
-const namedOnlyArgumentHashSet: Set<MethodRef> = new Set(argumentMap.namedOnlyArgumentHash as MethodRef[]);
+const namedOnlyFirstPositionSet: Set<MethodRef> = new Set(
+  argumentMap.namedOnlyFirstPosition as MethodRef[]
+);
+const namedOnlyArgumentHashSet: Set<MethodRef> = new Set(
+  argumentMap.namedOnlyArgumentHash as MethodRef[]
+);
 
 const port = process.env.PORT || 5999;
 const app = express();
@@ -128,7 +135,10 @@ app.post('/v2/:module/:method', async (req, res) => {
       const newArgList = [...namedArgumentMapper[methodRef]];
 
       for (const arg of newArgList) {
-        if ((arg.required && typeof body.params[arg.name] === 'undefined') || body.params[arg.name] === null) {
+        if (
+          (arg.required && typeof body.params[arg.name] === 'undefined') ||
+          body.params[arg.name] === null
+        ) {
           return {
             id: 1,
             jsonrpc: '2.0',
@@ -153,15 +163,25 @@ app.post('/v2/:module/:method', async (req, res) => {
     // positional args instead, which crashes those methods (confirmed via curl against
     // /map/get_star_map: bare-object params throws "Can't use string (...) as a HASH ref").
     // However that said..
-    if (namedOnlyFirstPositionSet.has(methodRef) && !Array.isArray(body.params) && body.params !== null) {
+    if (
+      namedOnlyFirstPositionSet.has(methodRef) &&
+      !Array.isArray(body.params) &&
+      body.params !== null
+    ) {
       body.params = [token ? { session_id: token, ...body.params } : body.params];
     }
 
     // .. there are cases when we need to support a bare hash being passed in as well!
-    else if (namedOnlyArgumentHashSet.has(methodRef) && !Array.isArray(body.params) && body.params !== null) {
+    else if (
+      namedOnlyArgumentHashSet.has(methodRef) &&
+      !Array.isArray(body.params) &&
+      body.params !== null
+    ) {
       body.params = token ? { session_id: token, ...body.params } : body.params;
     } else if (methodRef !== '/empire/login' && !!token && body.params !== null) {
-      body.params = Array.isArray(body.params) ? [token, ...body.params] : { session_id: token, ...body.params };
+      body.params = Array.isArray(body.params)
+        ? [token, ...body.params]
+        : { session_id: token, ...body.params };
     }
 
     return body;
diff --git a/package-lock.json b/package-lock.json
index 5548a26..1b85df9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -17,6 +17,7 @@
         "@types/cors": "^2.8.19",
         "@types/express": "^5.0.3",
         "@types/morgan": "^1.9.10",
+        "prettier": "^3.9.6",
         "typescript": "^5.9.2"
       },
       "engines": {
@@ -787,6 +788,22 @@
         "node": ">=16"
       }
     },
+    "node_modules/prettier": {
+      "version": "3.9.6",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.9.6.tgz",
+      "integrity": "sha512-OpN0zzVdiaiAhxpuuj5efpIS4sY9j7bY6uR5mnj5yPzGkdkjNKSJeUThPb60Jw29QuAZgA4o+/iB49kFiaBX6g==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "prettier": "bin/prettier.cjs"
+      },
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/prettier/prettier?sponsor=1"
+      }
+    },
     "node_modules/proxy-addr": {
       "version": "2.0.7",
       "resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.7.tgz",
diff --git a/package.json b/package.json
index 570185e..5cb9c7a 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,10 @@
     "node": ">= 22.6.0",
     "npm": ">= 10.0.0"
   },
+  "scripts": {
+    "format:check": "prettier --check .",
+    "format:fix": "prettier --write ."
+  },
   "dependencies": {
     "body-parser": "^2.2.0",
     "cors": "^2.8.5",
@@ -19,6 +23,7 @@
     "@types/cors": "^2.8.19",
     "@types/express": "^5.0.3",
     "@types/morgan": "^1.9.10",
+    "prettier": "^3.9.6",
     "typescript": "^5.9.2"
   }
 }