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Fetcher samples

Communicating with an API or external server is done through the Fetcher, a custom interface for making HTTP requests. The fetcher is made available through the context object passed in to formulas. The fetcher can only send requests to URLs that have have a domain name that's been registered using addNetworkDomain. The fetcher runs asynchronously, and is typically run within an async function that will await the result.

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Template (GET)

let response = await context.fetcher.fetch({
  method: "GET",
  url: "",
let data = response.body;

Template (POST)

let payload = {
  // TODO: Construct the JSON that the API expects.
let response = await context.fetcher.fetch({
  method: "POST",
  url: "",
  headers: {
    "Content-Type": "application/json",
  body: JSON.stringify(payload),
let data = response.body;

JSON Array (Bacon Ipsum)

import * as coda from "@codahq/packs-sdk";
export const pack = coda.newPack();

// When using the fetcher, this is the domain of the API that your pack makes
// fetcher requests to.

// This line adds a new formula to this Pack.
  name: "BaconIpsum",
  description: "Returns meat-themed lorem ipsum copy.",
  parameters: [], // No parameters required.
  resultType: coda.ValueType.String,

  // This function is declared async to that is can wait for the fetcher to
  // complete. The context parameter provides access to the fetcher.
  execute: async function ([], context) {
    let url = "";

    // The fetcher's fetch method makes the request. The await keyword is used
    // to wait for the API's response before continuing on through the code.
    let response = await context.fetcher.fetch({
      method: "GET",
      url: url,

    // The API returns an array of strings, which is automatically parsed by
    // the fetcher into a JavaScript object.
    let paragraphs = response.body;

    // Return the paragraphs separated by a blank line.
    return paragraphs.join("\n\n");