Change (U/V/Reroll)
Video & image generation
Change (U/V/Reroll)
POST /mj/submit/change — upscale, vary or reroll an existing task
POST
Change (U/V/Reroll)
Perform a follow-up action on a completed Midjourney task: Upscale, Variation, or Reroll.
Request
Parameters
| Field | Type | Required | Description |
|---|---|---|---|
taskId | string | ✅ | The task ID from the previous step |
action | string | ✅ | UPSCALE / VARIATION / REROLL |
index | integer | 1-4, which cell U/V refers to | |
notifyHook | string | Callback URL | |
state | string | Custom pass-through |
Other action endpoints
| Endpoint | Use |
|---|---|
POST /mj/submit/blend | Blend multiple images |
POST /mj/submit/describe | Reverse-engineer a prompt |
POST /mj/submit/zoom | Zoom-out expansion |
POST /mj/submit/pan | Horizontal / vertical extension |
POST /mj/submit/modal | Advanced modal-window operations |