LinkedIn Comments

Create and delete comments on LinkedIn posts programmatically.

Create Comment

POST https://api.postpost.dev/api/v1/linkedin-comments

Headers

Header	Required	Description
`x-api-key`	Yes	Your API key
`Content-Type`	Yes	`application/json`

Request Body

Parameter	Type	Required	Description
`postedId`	string	Yes	LinkedIn post URN (e.g., `urn:li:share:123`, `urn:li:ugcPost:456`, `urn:li:activity:789`)
`message`	string	Yes	The comment text
`platformId`	string	Yes	LinkedIn connection ID (format: `linkedin-ABC123`)
`parentComment`	string	No	Parent comment URN for threaded replies

Response (HTTP 201 Created)

{
  "success": true,
  "comment": {
    "id": "6636062862760562688",
    "commentUrn": "urn:li:comment:(urn:li:activity:7123456789012345678,6636062862760562688)",
    "message": "Great post! Thanks for sharing.",
    "created": {
      "time": 1710345600000
    }
  }
}

Note: The id field is the numeric comment ID extracted from the LinkedIn API's x-restli-id response header. The full comment URN is in the commentUrn field. The comment object also includes data returned by the LinkedIn API spread into it, so additional fields from the LinkedIn response may be present.

Note: Fields like created are passed through from LinkedIn's API response and may vary. They are not guaranteed to always be present.

Examples

JavaScript (fetch)

const response = await fetch('https://api.postpost.dev/api/v1/linkedin-comments', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'x-api-key': 'YOUR_API_KEY'
  },
  body: JSON.stringify({
    postedId: 'urn:li:share:7123456789012345678',
    message: 'Great post! Thanks for sharing.',
    platformId: 'linkedin-Tz9W5i6ZYG'
  })
});
const data = await response.json();
console.log(data.comment.id);

Python (requests)

import requests

response = requests.post(
    'https://api.postpost.dev/api/v1/linkedin-comments',
    headers={
        'Content-Type': 'application/json',
        'x-api-key': 'YOUR_API_KEY'
    },
    json={
        'postedId': 'urn:li:share:7123456789012345678',
        'message': 'Great post! Thanks for sharing.',
        'platformId': 'linkedin-Tz9W5i6ZYG'
    }
)
print(response.json()['comment']['id'])

cURL

curl -X POST https://api.postpost.dev/api/v1/linkedin-comments \
  -H "Content-Type: application/json" \
  -H "x-api-key: YOUR_API_KEY" \
  -d '{
    "postedId": "urn:li:share:7123456789012345678",
    "message": "Great post! Thanks for sharing.",
    "platformId": "linkedin-Tz9W5i6ZYG"
  }'

Reply to a Comment

To create a threaded reply, include the parentComment parameter:

const response = await fetch('https://api.postpost.dev/api/v1/linkedin-comments', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'x-api-key': 'YOUR_API_KEY'
  },
  body: JSON.stringify({
    postedId: 'urn:li:share:7123456789012345678',
    message: 'Thanks for the kind words!',
    platformId: 'linkedin-Tz9W5i6ZYG',
    parentComment: 'urn:li:comment:(urn:li:activity:7123456789012345678,6636062862760562688)'
  })
});

Delete Comment

DELETE https://api.postpost.dev/api/v1/linkedin-comments

Request Body or Query Parameters

Parameter	Type	Required	Description
`postedId`	string	Yes	LinkedIn post URN
`commentId`	string	Yes	Comment ID or URN to delete
`platformId`	string	Yes	LinkedIn connection ID

Response

{
  "success": true,
  "deleted": "6636062862760562688"
}

The deleted field contains the comment ID that was removed. This can be a numeric ID or a full URN (e.g., urn:li:comment:(urn:li:activity:123,6636062862760562688)), depending on what was passed as commentId.

Examples

JavaScript (fetch)

const response = await fetch('https://api.postpost.dev/api/v1/linkedin-comments', {
  method: 'DELETE',
  headers: {
    'Content-Type': 'application/json',
    'x-api-key': 'YOUR_API_KEY'
  },
  body: JSON.stringify({
    postedId: 'urn:li:share:7123456789012345678',
    commentId: '6636062862760562688',
    platformId: 'linkedin-Tz9W5i6ZYG'
  })
});

Python (requests)

response = requests.delete(
    'https://api.postpost.dev/api/v1/linkedin-comments',
    headers={
        'Content-Type': 'application/json',
        'x-api-key': 'YOUR_API_KEY'
    },
    json={
        'postedId': 'urn:li:share:7123456789012345678',
        'commentId': '6636062862760562688',
        'platformId': 'linkedin-Tz9W5i6ZYG'
    }
)

cURL

curl -X DELETE "https://api.postpost.dev/api/v1/linkedin-comments" \
  -H "Content-Type: application/json" \
  -H "x-api-key: YOUR_API_KEY" \
  -d '{
    "postedId": "urn:li:share:7123456789012345678",
    "commentId": "6636062862760562688",
    "platformId": "linkedin-Tz9W5i6ZYG"
  }'

Errors

Create Comment Errors (POST)

Status	Error	Cause
400	`"postedId, message, and platformId are required"`	Missing required fields
400	`"platformId must be a string"`	platformId is not a string type
400	`"postedId must be a valid LinkedIn URN"`	Not a valid LinkedIn URN format
400	`"message cannot be empty"`	Message is an empty string
400	`"message cannot exceed 1250 characters"`	Message exceeds LinkedIn's character limit
400	`"parentComment must be a valid LinkedIn URN"`	parentComment is not a valid URN format
400	`"Invalid platformId"`	platformId format is invalid
401	`"API key is required"`	No `x-api-key` header provided
401	`"Invalid API key"`	Bad or missing `x-api-key`
401	`"Invalid API key owner"`	API key owner user not found in database
403	`"API access is not enabled for this account"`	Account's plan does not include API access
404	`"LinkedIn connection not found"`	No LinkedIn account with that platformId
500	`"Failed to create LinkedIn comment"`	Server error while creating comment

Delete Comment Errors (DELETE)

Status	Error	Cause
400	`"postedId, commentId, and platformId are required"`	Missing required fields
400	`"platformId must be a string"`	platformId is not a string type
400	`"postedId must be a valid LinkedIn URN"`	Not a valid LinkedIn URN format
400	`"commentId must be a valid LinkedIn URN or numeric ID"`	commentId format is invalid
400	`"Invalid platformId"`	platformId format is invalid
401	`"API key is required"`	No `x-api-key` header provided
401	`"Invalid API key"`	Bad or missing `x-api-key`
401	`"Invalid API key owner"`	API key owner user not found in database
403	`"API access is not enabled for this account"`	Account's plan does not include API access
404	`"LinkedIn connection not found"`	No LinkedIn account with that platformId
500	`"Failed to delete LinkedIn comment"`	Server error while deleting comment

Note: The 500 error response includes a details field with the underlying error message: { "error": "Failed to delete LinkedIn comment", "details": "<error message>" }.

Note: Error status codes from the LinkedIn API may be forwarded directly (e.g., 403, 429), so you may receive error codes other than those listed above.

Implementation Notes

Create comment response field precedence: The create comment response constructs the comment object by spreading ...response.data from the LinkedIn API, then explicitly setting id, commentUrn, and message. If LinkedIn ever returns fields named id, commentUrn, or message in its response body, the explicit values will override them. However, if LinkedIn adds new fields with those names in a different format, the spread could briefly surface unexpected data before the override. In practice this is unlikely but worth noting for defensive parsing.
Delete comment commentId format: The REST API accepts both a full URN (e.g., urn:li:comment:(urn:li:activity:123,456)) and a plain numeric comment ID (e.g., "6636062862760562688"). The MCP tool description only mentions URN format, but both formats work identically via the REST API.

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