Node JS

GET

const response = await fetch('<YOUR ENDPOINT URL>', {
  headers: {
    'Content-Type': 'application/json',
    Accept: 'application/json',
    apiKey: '<YOURTOKEN>',
  },
  method: 'POST',
  body: JSON.stringify({
    options: {
      method: 'GET',
      headers: {
        'Content-Type': 'application/json',
        Accept: 'application/json',
      },
    },
    url: '/rest/api/3/issue/DEV-16',
  }),
});
const atlassianResponse = await response.text();
console.log('response', atlassianResponse);

POST

const response = await fetch('<YOUR ENDPOINT URL>', {
  headers: {
    'Content-Type': 'application/json',
    Accept: 'application/json',
    apiKey: '<YOURTOKEN>',
  },
  method: 'POST',
  body: JSON.stringify({
    options: {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        Accept: 'application/json',
      },
      body: {
        fields: {
          project: {
            name: '<your project name>',
          },
          summary: 'Create Issue via POST.',
          description: 'Creating of an issue via a POST request using the API Key Manager',
          issuetype: {
            id: '<your issue type id>',
          },
        },
      },
    },
    url: '/rest/api/2/issue',
  }),
});
const atlassianResponse = await response.text();
console.log('response', atlassianResponse);