> ## Documentation Index > Fetch the complete documentation index at: https://upstash-vector.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Publish #### Publish to a URL with a 3 second delay and headers/body ```typescript import { Client } from "@upstash/qstash"; const client = new Client({ token: "" }); const res = await client.publishJSON({ url: "https://my-api...", body: { hello: "world" }, headers: { "test-header": "test-value" }, delay: 3, }); ``` #### Publish to a topic with a 3 second delay and headers/body You can make a topic on the QStash console or using the [topics API](/qstash/sdks/ts/examples/topics) ```typescript import { Client } from "@upstash/qstash"; const client = new Client({ token: "" }); const res = await client.publishJSON({ topic: "mytopic", body: { hello: "world" }, headers: { "test-header": "test-value" }, delay: 3, }); // When publishing to a topic, the response is an array of messages for each URL in the topic console.log(res[0].messageId); ``` #### Publish a method with a callback URL [Callbacks](/qstash/features/callbacks) are useful for long running functions. Here, QStash will return the response of the publish request to the callback URL. We also change the `method` to `GET` in this use case so QStash will make a `GET` request to the `url`. The default is `POST`. ```typescript import { Client } from "@upstash/qstash"; const client = new Client({ token: "" }); const res = await client.publishJSON({ url: "https://my-api...", body: { hello: "world" }, callback: "https://my-callback...", failureCallback: "https://my-failure-callback...", method: "GET", }); ``` #### Configure the number of retries The max number of retries is based on your [QStash plan](https://upstash.com/pricing/qstash) ```typescript import { Client } from "@upstash/qstash"; const client = new Client({ token: "" }); const res = await client.publishJSON({ url: "https://my-api...", body: { hello: "world" }, retries: 1, }); ``` #### Publish HTML content instead of JSON ```typescript import { Client } from "@upstash/qstash"; const client = new Client({ token: "" }); const res = await client.publish({ url: "https://my-api...", body: "

Hello World

", headers: { "Content-Type": "text/html", }, }); ``` #### Publish a message with [content-based-deduplication](/qstash/features/deduplication) ```typescript import { Client } from "@upstash/qstash"; const client = new Client({ token: "" }); const res = await client.publishJSON({ url: "https://my-api...", body: { hello: "world" }, contentBasedDeduplication: true, }); ```