js post request example for discord webhooks using the fetch web api

discord-webhook.js

// node.js versions pre-v0.18.0 do not support the fetch api and require a polyfill
// const fetch = require('node-fetch');
fetch(
  'https://discordapp.com/api/webhooks/738983040323289120/mzhXrZz0hqOuUaPUjB_RBTE8XJUFLe8fe9mgeJjQCaxjHX14c3SW3ZR199_CDEI-xT56',
  {
    method: 'post',
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      // the username to be displayed
      username: 'webhook',
      // the avatar to be displayed
      avatar_url:
        'https://cdn.discordapp.com/avatars/411256446638882837/9a12fc7810795ded801fdb0401db0be6.png',
      // contents of the message to be sent
      content:
        'user mention: <@279098137484722176>, role mention: <@&496160161459863552>, channel mention: <#508500699458306049>',
      // enable mentioning of individual users or roles, but not @everyone/@here
      allowed_mentions: {
        parse: ['users', 'roles'],
      },
      // embeds to be sent
      embeds: [
        {
          // decimal number colour of the side of the embed
          color: 11730954,
          // author
          // - icon next to text at top (text is a link)
          author: {
            name: 'dragonwocky',
            url: 'https://dragonwocky.me/',
            icon_url: 'https://dragonwocky.me/assets/avatar.jpg',
          },
          // embed title
          // - link on 2nd row
          title: 'title',
          url:
            'https://gist.github.com/dragonwocky/ea61c8d21db17913a43da92efe0de634',
          // thumbnail
          // - small image in top right corner.
          thumbnail: {
            url:
              'https://cdn.discordapp.com/avatars/411256446638882837/9a12fc7810795ded801fdb0401db0be6.png',
          },
          // embed description
          // - text on 3rd row
          description: 'description',
          // custom embed fields: bold title/name, normal content/value below title
          // - located below description, above image.
          fields: [
            {
              name: 'field 1',
              value: 'value',
            },
            {
              name: 'field 2',
              value: 'other value',
            },
          ],
          // image
          // - picture below description(and fields)
          image: {
            url:
              'http://tolkiengateway.net/w/images/thumb/7/75/J.R.R._Tolkien_-_Ring_verse.jpg/300px-J.R.R._Tolkien_-_Ring_verse.jpg',
          },
          // footer
          // - icon next to text at bottom
          footer: {
            text: 'footer',
            icon_url:
              'https://cdn.discordapp.com/avatars/411256446638882837/9a12fc7810795ded801fdb0401db0be6.png',
          },
        },
      ],
    }),
  }
);

discord-webhook.md

@BizarreMaster16 that line is only required if you are using Node.js pre-v18.0.0 and is a limitation of old Node.js versions. This webhook code can be run in any other JavaScript environment (e.g. browser, Deno, Bun) without the need for a polyfill, so that line is up to users to add themselves if they need it instead of being part of the general code example, but I've added a comment to the gist to explain that.

@dragonwocky OK thank you

you can use my repository node-fetch-patch with nodejs.
its a polyfill, which installs node-fetch if it doesn't exist

is it possible to fetch messages from a channel with a webhook?

if your bot has access to the channel, you can do that. with required authorization tags(should be 'Bot <your bot token')