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POST
/
v1
/
inpaint
Inpaint
curl --request POST \
  --url https://api.legnext.ai/api/v1/inpaint \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "jobId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "imageNo": 0,
  "mask": {
    "areas": [
      {
        "width": 2298,
        "height": 2298,
        "points": [
          123
        ]
      }
    ],
    "url": "<string>"
  },
  "remixPrompt": "<string>",
  "callback": "<string>"
}
'
Repaint or modify specific regions within an existing generated image using mask-based editing.

​
Endpoint

POST https://api.legnext.ai/api/v1/inpaint

​
Headers

HeaderTypeRequiredDescription
x-api-keystringYesYour API key

​
Request Body

ParameterTypeRequiredDescription
jobIdstringYesID of the original image generation task
imageNointegerYesImage number to edit (0/1/2/3)
maskMaskYesRegions to repaint
remixPromptstringNoText prompt for the repaint area (1-8192 characters)
areaPolygonNoSingle polygon area to repaint (deprecated, use mask instead)
callbackstringNoCallback URL for task completion notifications

​
Data Types

​
Mask

Choose one of the following methods to define the repaint area:
FieldTypeDescription
areasPolygon[]Array of polygonal areas to repaint
urlstringBlack and white mask image URL (white areas will be repainted)

​
Polygon

FieldTypeDescription
widthintegerImage width in pixels (500-4096)
heightintegerImage height in pixels (500-4096)
pointsinteger[]Polygon coordinates in XYXY format, clockwise from top-left

​
Example Request

​
Using Polygon Areas

curl -X POST "https://api.legnext.ai/api/v1/inpaint" \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "jobId": "5dd94ec3-7282-4f04-9445-59e850ef1822",
    "imageNo": 0,
    "mask": {
        "areas": [
            {
                "width": 500,
                "height": 500,
                "points": [
                    10,
                    10,
                    10,
                    100,
                    100,
                    100,
                    100,
                    10
                ]
            }
        ]
    },
    "remixPrompt": "Add a tree in the center",
    "callback": "https://webhook.site/c98cb890-fb92-439f-8d60-42c8a51eb52d"
  }'

​
Using Mask Image

{
  "jobId": "job_12345",
  "imageNo": 0,
  "remixPrompt": "Add autumn leaves",
  "mask": {
    "url": "https://example.com/mask-image.png"
  },
  "callback": "https://your-domain.com/webhook"
}

​
Response

Returns a task object containing the task information. 
{
    "job_id": "72e20f1a-6c76-4ec5-bda2-490016056fa8",
    "model": "midjourney",
    "task_type": "inpaint",
    "status": "completed",
    "config": {
        "service_mode": "public",
        "webhook_config": {
            "endpoint": "https://webhook.site/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
            "secret": ""
        }
    },
    "input": null,
    "output": {
        "image_url": "https://cdn.legnext.ai/temp/1760415460188.png",
        "image_urls": [
            "https://cdn.legnext.ai/mj/72e20f1a-6c76-4ec5-bda2-490016056fa8_0.png",
            "https://cdn.legnext.ai/mj/72e20f1a-6c76-4ec5-bda2-490016056fa8_1.png",
            "https://cdn.legnext.ai/mj/72e20f1a-6c76-4ec5-bda2-490016056fa8_2.png",
            "https://cdn.legnext.ai/mj/72e20f1a-6c76-4ec5-bda2-490016056fa8_3.png"
        ],
        "seed": "1573740627",
        "available_actions": {
            "edit": [
                0,
                1,
                2,
                3
            ],
            "inpaint": [
                0,
                1,
                2,
                3
            ],
            "outpaint": [
                0,
                1,
                2,
                3
            ],
            "pan": [
                0,
                1,
                2,
                3
            ],
            "remix": [
                0,
                1,
                2,
                3
            ],
            "reroll": true,
            "upscale": [
                0,
                1,
                2,
                3
            ],
            "variation": [
                0,
                1,
                2,
                3
            ]
        }
    },
    "meta": {
        "created_at": "2025-10-14T04:14:22Z",
        "started_at": "2025-10-14T04:14:23Z",
        "ended_at": "2025-10-14T04:17:43Z",
        "usage": {
            "type": "point",
            "frozen": 120,
            "consume": 120
        }
    },
    "detail": null,
    "logs": [],
    "error": {
        "code": 0,
        "raw_message": "",
        "message": "",
        "detail": null
    }
}

Authorizations

​
x-api-key
string
header
required

API key for authentication

Body

application/json
​
jobId
string<uuid>
required

ID of the original image generation task

​
imageNo
integer
required

Image number to edit (0, 1, 2, or 3)

Required range: 0 <= x <= 3
Example:

0

​
mask
object
required

Regions to repaint (use either areas or url)

​
remixPrompt
string

Text prompt for the repaint area

Required string length: 1 - 8192
​
callback
string<uri>

Callback URL for task completion notifications

Response

200

Inpaint task created successfully