diff --git a/src/mediawiki.mjs b/src/mediawiki.mjs
index ac1d175..c13d74f 100644
--- a/src/mediawiki.mjs
+++ b/src/mediawiki.mjs
@@ -73,7 +73,11 @@ export class MediaWikiClient {
 				format: 'json',
 			}),
 		});
-		return response.json();
+		const body = await response.json();
+		if (body.error) {
+			throw new Error(`[${body.error.code}] ${body.error.info}`);
+		}
+		return body;
 	}
 
 	/**
@@ -155,7 +159,6 @@ export class MediaWikiClient {
 			token: csrfToken,
 			format: 'json',
 		});
-		// TODO: error handling
 		return body;
 	}