diff --git a/src/server/api/call.ts b/src/server/api/call.ts
index 20cb1ab7d..b87707c34 100644
--- a/src/server/api/call.ts
+++ b/src/server/api/call.ts
@@ -62,7 +62,15 @@ export default (endpoint: string, user: IUser, app: IApp, data: any, file?: any)
 			console.warn(`SLOW API CALL DETECTED: ${ep.name} (${time}ms)`);
 		}
 	} catch (e) {
-		rej(e.message);
+		if (e.name == 'INVALID_PARAM') {
+			rej({
+				code: e.name,
+				param: e.param,
+				reason: e.message
+			});
+		} else {
+			rej(e);
+		}
 		return;
 	}
 
diff --git a/src/server/api/get-params.ts b/src/server/api/get-params.ts
index e495e3ef3..878f223cc 100644
--- a/src/server/api/get-params.ts
+++ b/src/server/api/get-params.ts
@@ -12,7 +12,9 @@ export default function <T extends Defs>(defs: T, params: any): [{
 	Object.keys(defs.params).some(k => {
 		const [v, e] = defs.params[k].get(params[k]);
 		if (e) {
-			err = e;
+			err = new Error(e.message);
+			err.name = 'INVALID_PARAM';
+			(err as any).param = k;
 			return true;
 		} else {
 			if (v === undefined && defs.params[k].data.default) {