---
title: PUT /assets/{asset_id}/fields/{field_id}
slug: content-marketing-platform/api/put-assetsassetidfieldsfieldid
docTags:
createdAt: 2026-10-01T18:51:26.265Z
---
{
"id": "0mov328zffd-4h4dul4ez",
"type": "api-oas-v2",
"data": {
"method": "PUT",
"url": "https://api.cmp.optimizely.com/v3/assets/{asset_id}/fields/{field_id}",
"servers": [
{
"url": "https://api.cmp.optimizely.com/v3/assets/{asset_id}/fields/{field_id}",
"description": "v3 version of Optimizely CMP Open API"
}
],
"name": "PUT /assets/{asset_id}/fields/{field_id}",
"description": "Experimental Update the field value of an asset.
",
"contentType": "application/json",
"request": {
"pathParameters": [
{
"kind": "required",
"name": "asset_id",
"type": "string",
"example": "5f857f30e1c4a2038d6179e9",
"description": "Unique identifier of the asset"
},
{
"kind": "required",
"name": "field_id",
"type": "string",
"example": "4f857f30e1c4a2038d6179e7",
"description": "Unique identifier of the field of the asset"
}
],
"headerParameters": [
{
"name": "accept",
"type": "string",
"kind": "optional",
"description": "Generated from available response content types",
"enum": [
"application/json"
],
"default": "application/json"
}
],
"queryParameters": [],
"bodyDataParameters": [
{
"kind": "required",
"name": "body",
"type": "object",
"description": "Payload to update the field value",
"discriminator": {
"propertyName": "type",
"mapping": {
"checkbox": "#/components/schemas/MultiChoiceTypeObjectFieldUpdatePayload",
"currency_number": "#/components/schemas/NumberTypeObjectFieldUpdatePayload",
"date": "#/components/schemas/DateTypeObjectFieldUpdatePayload",
"dropdown": "#/components/schemas/DropdownTypeObjectFieldUpdatePayload",
"label": "#/components/schemas/MultiChoiceTypeObjectFieldUpdatePayload",
"radio_button": "#/components/schemas/RadioButtonTypeObjectFieldUpdatePayload",
"percentage_number": "#/components/schemas/NumberTypeObjectFieldUpdatePayload",
"simple_number": "#/components/schemas/NumberTypeObjectFieldUpdatePayload",
"text": "#/components/schemas/StringTypeObjectFieldUpdatePayload",
"text_area": "#/components/schemas/StringTypeObjectFieldUpdatePayload",
"rich_text": "#/components/schemas/StringTypeObjectFieldUpdatePayload",
"image": "#/components/schemas/AssetTypeObjectFieldUpdatePayload",
"video": "#/components/schemas/AssetTypeObjectFieldUpdatePayload"
}
},
"customType": "AssetFieldUpdateRequest",
"schema": [],
"modelRef": "#/components/schemas/AssetFieldUpdateRequest",
"complexItems": [
{
"name": "object",
"schema": [
{
"name": "type",
"kind": "required",
"type": "string",
"description": "Type of the field",
"example": "checkbox"
},
{
"name": "values",
"kind": "required",
"type": "array",
"description": "Values for the campaign field",
"example": "",
"itemType": "object",
"customType": "object[]",
"itemExample": "",
"itemDefault": ""
},
{
"name": "values",
"kind": "optional",
"type": "array",
"description": "Any single string",
"example": "",
"itemType": "string",
"customType": "string[]",
"itemExample": "This is a test string",
"itemDefault": ""
}
],
"modelRef": "#/components/schemas/StringTypeObjectFieldUpdatePayload",
"customType": "StringTypeObjectFieldUpdatePayload"
},
{
"name": "object",
"schema": [
{
"name": "type",
"kind": "required",
"type": "string",
"description": "Type of the field",
"example": "checkbox"
},
{
"name": "values",
"kind": "required",
"type": "array",
"description": "Values for the campaign field",
"example": "",
"itemType": "object",
"customType": "object[]",
"itemExample": "",
"itemDefault": ""
},
{
"name": "values",
"kind": "optional",
"type": "array",
"description": "Array of choice IDs",
"example": "",
"itemType": "string",
"customType": "string[]",
"itemExample": "9119a313057e401189407116fcd3",
"itemDefault": ""
}
],
"modelRef": "#/components/schemas/MultiChoiceTypeObjectFieldUpdatePayload",
"customType": "MultiChoiceTypeObjectFieldUpdatePayload"
},
{
"name": "object",
"schema": [
{
"name": "type",
"kind": "required",
"type": "string",
"description": "Type of the field",
"example": "checkbox"
},
{
"name": "values",
"kind": "required",
"type": "array",
"description": "Values for the campaign field",
"example": "",
"itemType": "object",
"customType": "object[]",
"itemExample": "",
"itemDefault": ""
},
{
"name": "values",
"kind": "optional",
"type": "array",
"description": "Array of choice ID. Multiple choice values are not acceptable for is_multi_select=false.
",
"example": "",
"itemType": "string",
"customType": "string[]",
"itemExample": "9119a313057e401189407116fcd3",
"itemDefault": ""
}
],
"modelRef": "#/components/schemas/DropdownTypeObjectFieldUpdatePayload",
"customType": "DropdownTypeObjectFieldUpdatePayload"
},
{
"name": "object",
"schema": [
{
"name": "type",
"kind": "required",
"type": "string",
"description": "Type of the field",
"example": "checkbox"
},
{
"name": "values",
"kind": "required",
"type": "array",
"description": "Values for the campaign field",
"example": "",
"itemType": "object",
"customType": "object[]",
"itemExample": "",
"itemDefault": ""
},
{
"name": "values",
"kind": "optional",
"type": "array",
"description": "Accepts a single choice Id.",
"example": "",
"itemType": "string",
"customType": "string[]",
"itemExample": "9119a313057e401189407116fcd3",
"itemDefault": ""
}
],
"modelRef": "#/components/schemas/RadioButtonTypeObjectFieldUpdatePayload",
"customType": "RadioButtonTypeObjectFieldUpdatePayload"
},
{
"name": "object",
"schema": [
{
"name": "type",
"kind": "required",
"type": "string",
"description": "Type of the field",
"example": "checkbox"
},
{
"name": "values",
"kind": "required",
"type": "array",
"description": "Values for the campaign field",
"example": "",
"itemType": "object",
"customType": "object[]",
"itemExample": "",
"itemDefault": ""
},
{
"name": "values",
"kind": "optional",
"type": "array",
"description": "Accepts a single numeric value",
"example": "",
"itemType": "number",
"customType": "number[]",
"itemExample": 200,
"itemDefault": ""
}
],
"modelRef": "#/components/schemas/NumberTypeObjectFieldUpdatePayload",
"customType": "NumberTypeObjectFieldUpdatePayload"
},
{
"name": "object",
"schema": [
{
"name": "type",
"kind": "required",
"type": "string",
"description": "Type of the field",
"example": "checkbox"
},
{
"name": "values",
"kind": "required",
"type": "array",
"description": "Values for the campaign field",
"example": "",
"itemType": "object",
"customType": "object[]",
"itemExample": "",
"itemDefault": ""
},
{
"name": "values",
"kind": "optional",
"type": "array",
"description": "Array of date-time values, in ISO 8601 UTC format (2020-02-10T10:40
)",
"example": "",
"itemType": "string",
"customType": "string[]",
"itemExample": "2020-02-10T10:40:45Z",
"itemDefault": ""
}
],
"modelRef": "#/components/schemas/DateTypeObjectFieldUpdatePayload",
"customType": "DateTypeObjectFieldUpdatePayload"
},
{
"name": "object",
"schema": [
{
"name": "type",
"kind": "required",
"type": "string",
"description": "Type of the field",
"example": "checkbox"
},
{
"name": "values",
"kind": "required",
"type": "array",
"description": "Values for the campaign field",
"example": "",
"itemType": "object",
"customType": "object[]",
"itemExample": "",
"itemDefault": ""
},
{
"name": "values",
"kind": "optional",
"type": "array",
"description": "Payload for fields with attachments",
"example": "",
"itemType": "object",
"customType": "object[]",
"schema": [
{
"name": "title",
"kind": "required",
"type": "string",
"description": "Title of the image or video",
"example": "Sample.jpeg",
"minLength": 1
},
{
"name": "key",
"kind": "required",
"type": "string",
"description": "Unique identifier of the file upload session. This is the upload_meta_fields.key field retrieved from the /v3/upload-url endpoint.
",
"example": "ce8995aea58b11ea8cd90242ac120005"
}
]
}
],
"modelRef": "#/components/schemas/AssetTypeObjectFieldUpdatePayload",
"customType": "AssetTypeObjectFieldUpdatePayload"
}
],
"complexType": "oneOf",
"isExpanded": true
}
],
"formDataParameters": [],
"oAuthParameters": [
{
"id": "OAuth2",
"name": "OAuth2",
"kind": "optional",
"type": "oauth2",
"oauth2Flows": {
"clientCredentials": {
"tokenUrl": "https://accounts.cmp.optimizely.com/o/oauth2/v1/token",
"scopes": {}
},
"authorizationCode": {
"authorizationUrl": "https://accounts.cmp.optimizely.com/o/oauth2/v1/auth",
"tokenUrl": "https://accounts.cmp.optimizely.com/o/oauth2/v1/token",
"scopes": {
"openid": "Grants the ability to receive a unique identifier for the user.",
"profile": "Grants access to user profile information.",
"offline_access": "Grants the ability to refresh access_token using the refresh token even when user is not present (not logged in)."
}
}
},
"requiredScopes": [
"openid",
"profile",
"offline_access"
]
}
],
"cookieParameters": []
},
"responses": [
{
"statusCode": "200",
"description": "Updated the asset field",
"jsonExample": "",
"isExpanded": true,
"schema": [
{
"kind": "optional",
"type": "object",
"description": "",
"customType": "AssetFieldUpdateResponse",
"schema": [
{
"name": "id",
"kind": "required",
"type": "string",
"description": "Unique identifier for the field",
"example": "5a7f910511b0a72230ce6631"
},
{
"name": "name",
"kind": "required",
"type": "string",
"description": "Name of the field",
"example": "Image Field"
},
{
"name": "type",
"kind": "required",
"type": "string",
"description": "Type of the field",
"example": "image",
"modelRef": "#/components/schemas/AssetFieldTypes",
"customType": "AssetFieldTypes",
"schema": []
},
{
"name": "values",
"kind": "required",
"type": "array",
"description": "List of values selected or from user input",
"example": "[\"1nu8ue9wf8u9nusd9u\"]",
"itemType": "string",
"customType": "string[]",
"itemExample": "1nu8ue9wf8u9nusd9u",
"itemDefault": ""
},
{
"name": "links",
"kind": "required",
"type": "object",
"description": "Meta links",
"example": "",
"schema": [
{
"name": "asset_fields",
"kind": "required",
"type": "string",
"description": "URL of the asset fields",
"example": "https://api.cmp.optimizely.com/v3/assets/5f857f30e1c4a2038d6179e9/fields"
},
{
"name": "asset",
"kind": "required",
"type": "string",
"description": "URL of the asset",
"example": "https://api.cmp.optimizely.com/v3/assets/5f857f30e1c4a2038d6179e9"
}
]
}
],
"modelRef": "#/components/schemas/AssetFieldUpdateResponse",
"isExpanded": true
}
]
},
{
"statusCode": "400",
"description": "Client error",
"jsonExample": "",
"isExpanded": true,
"schema": [
{
"kind": "optional",
"type": "object",
"example": "{\"message\":\"Unsupported arguments: a,b,c\"}",
"description": "Error payload",
"customType": "Error",
"schema": [
{
"name": "message",
"kind": "required",
"type": "string",
"description": "Message describing the error",
"example": "Not found"
},
{
"name": "errors",
"kind": "optional",
"type": "map",
"description": "Additional information",
"example": "",
"customType": "map",
"schema": []
}
],
"modelRef": "#/components/schemas/Error",
"isExpanded": true
}
]
},
{
"statusCode": "401",
"description": "Authorization error",
"jsonExample": "",
"isExpanded": true,
"schema": [
{
"kind": "optional",
"type": "object",
"example": "{\"message\":\"Unauthorized\"}",
"description": "Error payload",
"customType": "Error",
"schema": [
{
"name": "message",
"kind": "required",
"type": "string",
"description": "Message describing the error",
"example": "Not found"
},
{
"name": "errors",
"kind": "optional",
"type": "map",
"description": "Additional information",
"example": "",
"customType": "map",
"schema": []
}
],
"modelRef": "#/components/schemas/Error",
"isExpanded": true
}
]
},
{
"statusCode": "403",
"description": "Permission error",
"jsonExample": "",
"isExpanded": true,
"schema": [
{
"kind": "optional",
"type": "object",
"example": "{\"message\":\"You do not have the permission to perform this operation\"}",
"description": "Error payload",
"customType": "Error",
"schema": [
{
"name": "message",
"kind": "required",
"type": "string",
"description": "Message describing the error",
"example": "Not found"
},
{
"name": "errors",
"kind": "optional",
"type": "map",
"description": "Additional information",
"example": "",
"customType": "map",
"schema": []
}
],
"modelRef": "#/components/schemas/Error",
"isExpanded": true
}
]
},
{
"statusCode": "404",
"description": "Not found error",
"jsonExample": "",
"isExpanded": true,
"schema": [
{
"kind": "optional",
"type": "object",
"example": "{\"message\":\"Resource not found\"}",
"description": "Error payload",
"customType": "Error",
"schema": [
{
"name": "message",
"kind": "required",
"type": "string",
"description": "Message describing the error",
"example": "Not found"
},
{
"name": "errors",
"kind": "optional",
"type": "map",
"description": "Additional information",
"example": "",
"customType": "map",
"schema": []
}
],
"modelRef": "#/components/schemas/Error",
"isExpanded": true
}
]
}
],
"hasXCodeSamples": false,
"examples": {
"languages": [
{
"id": "uNRFZ7dSg4cdqy51zDGqp",
"language": "curl",
"label": "cURL",
"code": "curl --request PUT \\\n --url https://api.cmp.optimizely.com/v3/assets/{asset_id}/fields/{field_id} \\\n --header 'accept: application/json' \\\n --header 'content-type: application/json' \\\n --data '{\n \"type\": \"checkbox\",\n \"values\": []\n }'"
},
{
"id": "clPjJ_YB40YnqrScN7_0p",
"language": "javascript",
"label": "javascript",
"code": "var myHeaders = new Headers();\nmyHeaders.append(\"accept\", \"application/json\");\nmyHeaders.append(\"content-type\", \"application/json\");\n\nvar raw = JSON.stringify({\n \"type\": \"checkbox\",\n \"values\": []\n});\n\nvar requestOptions = {\n method: 'PUT',\n headers: myHeaders,\n body: raw,\n redirect: 'follow'\n};\n\nfetch(\"https://api.cmp.optimizely.com/v3/assets/{asset_id}/fields/{field_id}\", requestOptions)\n .then(response => response.text())\n .then(result => console.log(result))\n .catch(error => console.log('error', error));"
},
{
"id": "vhEHQYOhKEr2Wx7gXx71D",
"language": "ruby",
"label": "Ruby",
"code": "require \"uri\"\nrequire \"json\"\nrequire \"net/http\"\n\nurl = URI(\"https://api.cmp.optimizely.com/v3/assets/{asset_id}/fields/{field_id}\")\n\nhttps = Net::HTTP.new(url.host, url.port)\nhttps.use_ssl = true\n\nrequest = Net::HTTP::Put.new(url)\nrequest[\"accept\"] = \"application/json\"\nrequest[\"content-type\"] = \"application/json\"\nrequest.body = JSON.dump({\n \"type\": \"checkbox\",\n \"values\": []\n})\n\nresponse = https.request(request)\nputs response.read_body\n"
},
{
"id": "Ui_ZMz-PSAz00glbXvQ8k",
"language": "python",
"label": "Python",
"code": "import requests\nimport json\n\nurl = \"https://api.cmp.optimizely.com/v3/assets/{asset_id}/fields/{field_id}\"\n\npayload = json.dumps({\n \"type\": \"checkbox\",\n \"values\": []\n})\nheaders = {\n 'accept': 'application/json',\n 'content-type': 'application/json'\n}\n\nresponse = requests.request(\"PUT\", url, headers=headers, data=payload)\n\nprint(response.text)\n"
}
],
"selectedLanguageId": "uNRFZ7dSg4cdqy51zDGqp"
},
"results": {
"languages": [
{
"id": "response-0-200",
"language": "200",
"code": "// Updated the asset field\n{\n \"id\": \"5a7f910511b0a72230ce6631\",\n \"name\": \"Image Field\",\n \"type\": \"image\",\n \"values\": [\n \"1nu8ue9wf8u9nusd9u\"\n ],\n \"links\": {\n \"asset_fields\": \"https://api.cmp.optimizely.com/v3/assets/5f857f30e1c4a2038d6179e9/fields\",\n \"asset\": \"https://api.cmp.optimizely.com/v3/assets/5f857f30e1c4a2038d6179e9\"\n }\n}"
},
{
"id": "response-1-400",
"language": "400",
"code": "// Client error\n{\n \"message\": \"Not found\",\n \"errors\": \"\"\n}"
},
{
"id": "response-2-401",
"language": "401",
"code": "// Authorization error\n{\n \"message\": \"Not found\",\n \"errors\": \"\"\n}"
},
{
"id": "response-3-403",
"language": "403",
"code": "// Permission error\n{\n \"message\": \"Not found\",\n \"errors\": \"\"\n}"
},
{
"id": "response-4-404",
"language": "404",
"code": "// Not found error\n{\n \"message\": \"Not found\",\n \"errors\": \"\"\n}"
}
],
"selectedLanguageId": "response-0-200"
}
},
"children": [
{
"text": ""
}
]
}