The URL should include the object key and a record ID, while the headers will include one for content-type as well as those for authentication.

URL
PUT https://api.knack.com/v1/objects/object_xx/records/record_ID

Parameters

Parameter	Explanation	Example
object_xx	object key	object_1
record_ID	A record’s ID	575482d691e16d4235adcdb6

Headers

Key	Value
X-Knack-Application-Id	Your application ID
X-Knack-REST-API-KEY	Your API key
content-type	application/json

Example Request

# Update a Company record
curl -X PUT "https://api.knack.com/v1/objects/object_1/records/58643557d1ea9432222f3cbb" \
  -H "X-Knack-Application-Id: YOUR-APP-ID" \
  -H "X-Knack-REST-API-Key: YOUR-API-KEY" \
  -H "Content-Type: application/json" \
  -d '{
        "field_1":"Updated name",
        "field_18":"Other"
      }'

Example Response (200 OK)

{
  "id": "58643557d1ea9432222f3cbb",
  "field_1": "Updated name",
  "field_1_raw": "Updated name",
  "field_16": "4913 Gnatty Creek Road
Westbury, NY 11590",
  "field_16_raw": {
    "street": "4913 Gnatty Creek Road",
    "city": "Westbury",
    "state": "NY",
    "zip": "11590",
    "latitude": 40.89964,
    "longitude": -73.601586
  },
  "field_17": "<a href=\"http://www.pearlinc.com\" target=\"_blank\">http://www.pearlinc.com</a>",
  "field_17_raw": {
    "url": "http://www.pearlinc.com"
  },
  "field_18": "Other",
  "field_18_raw": "Other",
  "field_31": "516-334-3077",
  "field_31_raw": "516-334-3077"

}