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API Reference

Add an Upload Part

Stream one multipart Part into an unfinished Upload.

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Stream one multipart Part into an unfinished Upload.

Endpoint

POST /v1/uploads/:upload_id/parts
Base URL
https://runapi.ai
API version
v1
Authentication
Authorization: Bearer YOUR_API_KEY
02

Request

JSON body

Send values only in the listed request location.

Path parameters1 field
upload_idstring
Required

RunAPI Upload ID.

multipart/form-data1 field
datastring
Required

Upload Part bytes.

03

Success response

HTTP 200

POST /v1/uploads/:upload_id/parts

JSON 
{
  "created_at": 1785196860,
  "id": "part_abc123",
  "object": "upload.part",
  "upload_id": "upload_abc123"
}
04

Error response (401)

HTTP 401
Response schema
JSON 
{
  "additionalProperties": true,
  "properties": {
    "error": {
      "additionalProperties": true,
      "properties": {
        "code": {
          "type": [
            "string",
            "null"
          ]
        },
        "message": {
          "type": "string"
        },
        "param": {
          "type": [
            "string",
            "null"
          ]
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "message",
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "error"
  ],
  "type": "object"
}

Response example

JSON 
{
  "error": {
    "code": "authentication_error",
    "message": "Missing API key",
    "param": null,
    "type": "authentication_error"
  }
}
05

Error response (400)

HTTP 400
Response schema
JSON 
{
  "additionalProperties": true,
  "properties": {
    "error": {
      "additionalProperties": true,
      "properties": {
        "code": {
          "type": [
            "string",
            "null"
          ]
        },
        "message": {
          "type": "string"
        },
        "param": {
          "type": [
            "string",
            "null"
          ]
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "message",
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "error"
  ],
  "type": "object"
}

Response example

JSON 
{
  "error": {
    "code": "invalid_request_error",
    "message": "Malformed request",
    "param": null,
    "type": "invalid_request_error"
  }
}
06

Error response (404)

HTTP 404
Response schema
JSON 
{
  "additionalProperties": true,
  "properties": {
    "error": {
      "additionalProperties": true,
      "properties": {
        "code": {
          "type": [
            "string",
            "null"
          ]
        },
        "message": {
          "type": "string"
        },
        "param": {
          "type": [
            "string",
            "null"
          ]
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "message",
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "error"
  ],
  "type": "object"
}

Response example

JSON 
{
  "error": {
    "code": "not_found",
    "message": "File not found",
    "param": null,
    "type": "invalid_request_error"
  }
}
07

Error response (409)

HTTP 409
Response schema
JSON 
{
  "additionalProperties": true,
  "properties": {
    "error": {
      "additionalProperties": true,
      "properties": {
        "code": {
          "type": [
            "string",
            "null"
          ]
        },
        "message": {
          "type": "string"
        },
        "param": {
          "type": [
            "string",
            "null"
          ]
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "message",
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "error"
  ],
  "type": "object"
}

Response example

JSON 
{
  "error": {
    "code": "upload_state_conflict",
    "message": "Upload state conflict",
    "param": null,
    "type": "invalid_request_error"
  }
}
08

Error response (413)

HTTP 413
Response schema
JSON 
{
  "additionalProperties": true,
  "properties": {
    "error": {
      "additionalProperties": true,
      "properties": {
        "code": {
          "type": [
            "string",
            "null"
          ]
        },
        "message": {
          "type": "string"
        },
        "param": {
          "type": [
            "string",
            "null"
          ]
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "message",
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "error"
  ],
  "type": "object"
}

Response example

JSON 
{
  "error": {
    "code": "file_too_large",
    "message": "File size exceeds the maximum allowed size",
    "param": "file",
    "type": "invalid_request_error"
  }
}
09

Error response (422)

HTTP 422
Response schema
JSON 
{
  "additionalProperties": true,
  "properties": {
    "error": {
      "additionalProperties": true,
      "properties": {
        "code": {
          "type": [
            "string",
            "null"
          ]
        },
        "message": {
          "type": "string"
        },
        "param": {
          "type": [
            "string",
            "null"
          ]
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "message",
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "error"
  ],
  "type": "object"
}

Response example

JSON 
{
  "error": {
    "code": "invalid_upload",
    "message": "Upload request rejected",
    "param": null,
    "type": "invalid_request_error"
  }
}
10

Error response (502)

HTTP 502
Response schema
JSON 
{
  "additionalProperties": true,
  "properties": {
    "error": {
      "additionalProperties": true,
      "properties": {
        "code": {
          "type": [
            "string",
            "null"
          ]
        },
        "message": {
          "type": "string"
        },
        "param": {
          "type": [
            "string",
            "null"
          ]
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "message",
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "error"
  ],
  "type": "object"
}

Response example

JSON 
{
  "error": {
    "code": "storage_write_failed",
    "message": "File storage failed",
    "param": null,
    "type": "server_error"
  }
}
11

cURL example

CURL 
curl -X POST https://runapi.ai/v1/uploads/upload_abc123/parts \
  -H 'Authorization: Bearer YOUR_API_KEY' \
  -F 'data=@./archive.part-01'