---
title: "Send a Webhook to Trello | WebhookRelay"
meta:
  "og:description": "Send any webhook to Trello. Transform an incoming webhook into the Trello API format in flight and forward it — no glue server, no code to maintain."
  "og:title": "Send a Webhook to Trello"
  description: "Send any webhook to Trello. Transform an incoming webhook into the Trello API format in flight and forward it — no glue server, no code to maintain."
---

![Stripes](https://webhookrelay.com/blog/webhook-to-trello/images/stripes.svg)

# **Send a Webhook to Trello**

Send any webhook to Trello. Transform an incoming webhook into the Trello API format in flight and forward it — no glue server, no code to maintain.

![Send a Webhook to Trello: Transform & Forward Any Payload](https://webhookrelay.com/blog/webhook-to-trello/images/blog/heroes/route.jpg)

You have a service that fires webhooks — a form, a payment provider, a CI pipeline, a monitoring tool — and you want each event to create a card in **Trello**. The problem: the Trello API won't accept the raw webhook. It expects its own JSON shape and authentication, and the payload your source sends never matches.

[Webhook Relay](https://webhookrelay.com) sits in the middle. It receives the incoming webhook at a stable public URL, **transforms** the payload into the format Trello expects, and delivers it — no glue server, no Lambda, no maintenance.

## [How it works](#how-it-works)

1. Your source service POSTs its webhook to a Webhook Relay endpoint.
2. A transformation function parses the payload and builds a Trello API request.
3. Webhook Relay forwards it to Trello, and the record is created.

## [Step 1: Get your Trello credentials](#step-1-get-your-trello-credentials)

You need a Trello **API key** and **token** (trello.com/app-key), and the **list ID** to add cards to.

## [Step 2: Create a Webhook Relay output to the Trello API](#step-2-create-a-webhook-relay-output-to-the-trello-api)

Create a bucket with a public input, then add an output pointing at the Trello API:

- **Output destination:** `https://api.trello.com/1/cards?key=KEY&token=TOKEN&idList=LIST_ID` — Trello takes the key, token and target list as **query parameters**, not headers.
- **Headers:** `Content-Type: application/json`

## [Step 3: Add a transformation function](#step-3-add-a-transformation-function)

Attach a function that reshapes the incoming webhook. Trello's create-card endpoint takes the `key`, `token` and `idList` as query parameters and the card `name`/`desc` in the body.

```
-- incoming payload is in r.RequestBody
local body = json.decode(r.RequestBody)

local card = {
  name = body.title or "Card from webhook",
  desc = body.message or r.RequestBody
}

r:SetRequestBody(json.encode(card))
```

## [Step 4: Point your source at the URL and test](#step-4-point-your-source-at-the-url-and-test)

Configure your source service's webhook to point at the Webhook Relay public URL. Trigger an event — or replay one from the [Webhook Bin](https://webhookrelay.com/blog/webhook-to-trello/webhook-bin/) — and the record appears in Trello within seconds. If the API rejects the request, the Webhook Relay logs show Trello's exact error so you can fix the mapping.

## [Going further](#going-further)

- **Fan out:** send the same event to [Jira](https://webhookrelay.com/blog/webhook-to-trello/blog/webhook-to-jira/) or [Discord](https://webhookrelay.com/blog/webhook-to-trello/blog/webhook-to-discord/) at the same time with [multiple destinations](https://webhookrelay.com/blog/webhook-to-trello/features/webhook-multiple-destinations/).
- **Filter:** use [forwarding rules](https://webhookrelay.com/blog/webhook-to-trello/features/forwarding-rules/) so only the events you care about reach Trello.
- **Inspect first:** see the raw payload in the [Webhook Bin](https://webhookrelay.com/blog/webhook-to-trello/webhook-bin/) before writing the mapping.

## [Get started](#get-started)

[Create a free Webhook Relay account](https://my.webhookrelay.com/register) and turn any webhook into Trello records — no servers to run. New to webhooks? Start with [what is a webhook](https://webhookrelay.com/blog/webhook-to-trello/blog/what-is-webhook/) and [how to transform webhooks](https://webhookrelay.com/blog/webhook-to-trello/features/transform-webhooks/).