LinkedIn Comments

Post comments on LinkedIn posts programmatically using the PostPost API. Engage with your network automatically without manual interaction.

Overview

PostPost allows you to create and delete comments on any LinkedIn post visible to your connected account. You can also reply to existing comments (nested replies).

Prerequisites

PostPost API key
LinkedIn account connected via PostPost dashboard
The postedId (LinkedIn URN) of the post you want to comment on

Create a Comment

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

Parameters

Parameter	Type	Required	Description
`postedId`	string	Yes	LinkedIn post URN (e.g., `urn:li:share:123` or `urn:li:ugcPost:123`)
`message`	string	Yes	Comment text (max 1,250 characters)
`platformId`	string	Yes	Your LinkedIn platform ID (e.g., `linkedin-ABC123`)
`parentComment`	string	No	Comment URN for nested replies

JavaScript Example

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:ugcPost:7429953213384187904',
    message: 'Great insights! Thanks for sharing.',
    platformId: 'linkedin-ABC123'
  })
});

const data = await response.json();
console.log(data);
// {
//   success: true,
//   comment: {
//     id: "7434695495614312448",
//     commentUrn: "urn:li:comment:(urn:li:ugcPost:xxx,7434695495614312448)",
//     message: "Great insights! Thanks for sharing."
//   }
// }

Python Example

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:ugcPost:7429953213384187904',
        'message': 'Great insights! Thanks for sharing.',
        'platformId': 'linkedin-ABC123'
    }
)

print(response.json())

cURL Example

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:ugcPost:7429953213384187904",
    "message": "Great insights! Thanks for sharing.",
    "platformId": "linkedin-ABC123"
  }'

Reply to a Comment

To reply to an existing comment, 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:ugcPost:7429953213384187904',
    message: 'I completely agree with your point!',
    platformId: 'linkedin-ABC123',
    parentComment: 'urn:li:comment:(urn:li:ugcPost:xxx,7434695495614312448)'
  })
});

Delete a Comment

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

Parameters

Parameter	Type	Required	Description
`postedId`	string	Yes	LinkedIn post URN the comment belongs to
`commentId`	string	Yes	Comment URN or numeric comment ID (both formats accepted via the REST API)
`platformId`	string	Yes	Your LinkedIn platform ID

JavaScript Example

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:ugcPost:7429953213384187904',
    commentId: 'urn:li:comment:(urn:li:ugcPost:xxx,7434695495614312448)',
    platformId: 'linkedin-ABC123'
  })
});

const data = await response.json();
// { success: true, deleted: "urn:li:comment:(...)" }

Getting the postedId

For posts created via PostPost, get the postedId from the get-post endpoint:

const response = await fetch('https://api.postpost.dev/api/v1/get-post/YOUR_POST_GROUP_ID', {
  headers: { 'x-api-key': 'YOUR_API_KEY' }
});

const data = await response.json();
const postedId = data.posts[0].postedId; // e.g., "urn:li:share:7434685316856377344"

Important Notes

Character limit: Comments are limited to 1,250 characters
Network visibility: You can only comment on posts visible to your LinkedIn account
URN format: Use urn:li:share:xxx or urn:li:ugcPost:xxx format (not urn:li:activity:xxx from URLs)
MCP tool note: When using the PostPost MCP tool for deleting comments, the tool description only mentions URN format for commentId. The REST API accepts both URN and numeric ID formats.

LinkedIn Reactions - Like and react to posts
LinkedIn Mentions - Mention users and companies
LinkedIn Platform Guide - Complete LinkedIn API reference

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