---
source_url: https://www.pubnub.com/docs/sdks/rest-api/publish-introduction
title: Publish introduction
---

# Publish introduction

> For AI agents: documentation index at https://www.pubnub.com/llms-full.txt

[Publish](https://www.pubnub.com/docs/pub-sub/publish/overview.md) lets you send a message to a channel.

## Valid/Success responses

Returns a three-element array:

* Array element 0 - (Integer) `1` or `0`, where `1` is a success, and `0` is an error.
* Array element 1 - (String) Description of the success or error, if available.
* Array element 2 - (String) The current PubNub time expressed as a timetoken.

### Example

A sample response from the server [`1,"Sent","14375189629170609"`] contains the following fields:

* The first element is an integer of value `1` representing success.
* The second element is a string description of the success, which for `200` response codes will always be "Sent."
* The third element is the string timetoken value the system accepted the Publish operation at.

## Invalid/Error responses

Errors specific to Publish will occur when the URL (for example, message payload) is too large (>=32K) and invalid publish and/or subscribe keys are used.

In the event of an error, you will receive a non-`200` HTTP status code and a two-element array. You can parse the second element of the returned array for a description of the error.