How to send GraphQL mutation from one server to another?

Question

I would like to save some Slack messages to a GraphQL backend. I can use the Slack API and what they call "Slack App Commands" so everytime a message is send to my Slack channel, Slack will automatically send a HTTP POST request to my server with the new message as data.

I was thinking using an AWS lambda function to forward this post request to my GraphQL server endpoint (I am using GraphCool). I am pretty new to GraphQL, I've used Apollo to create mutations from the browser. Now I need to send mutation from my Node server (AWS Lambda function) instead of the browser. How can I achieve that?

Thanks.

Answer 1

GraphQL mutations are simply HTTP POST requests to a GraphQL endpoint. You can easily send one using any HTTP library such as request or axios.

For example, this mutation,

mutation ($id: Int!) {
  upvotePost(postId: $id) {
    id
  }
}

and query variable,

$id = 1

is an HTTP POST request with a JSON payload of

{
  "query": "mutation ($id: Int!) { upvotePost(postId: $id) { id } } ", 
  "variables": { "id": 1 } 
}

Take note that query is your GraphQL query as a string.

Using axios as an example, you can send this to your server using something like this,

axios({
  method: 'post',
  url: '/graphql',
  // payload is the payload above
  data: payload,
});