diff --git a/ts/types/MIME.ts b/ts/types/MIME.ts
index c2cc66ac58..cc4c61b3ae 100644
--- a/ts/types/MIME.ts
+++ b/ts/types/MIME.ts
@@ -1,10 +1,12 @@
 export type MIMEType = string & { _mimeTypeBrand: any };
 
 export const APPLICATION_OCTET_STREAM = 'application/octet-stream' as MIMEType;
+export const APPLICATION_JSON = 'application/json' as MIMEType;
 export const AUDIO_AAC = 'audio/aac' as MIMEType;
 export const AUDIO_MP3 = 'audio/mp3' as MIMEType;
 export const IMAGE_GIF = 'image/gif' as MIMEType;
 export const IMAGE_JPEG = 'image/jpeg' as MIMEType;
+export const VIDEO_MP4 = 'video/mp4' as MIMEType;
 export const VIDEO_QUICKTIME = 'video/quicktime' as MIMEType;
 
 export const isJPEG = (value: MIMEType): boolean => value === 'image/jpeg';