Create labels on specific repository using Postman tests tab

createLabelsViaPostman.js

const ghToken = pm.globals.get("GH_PAT"); // environment variable with GitHub PAT (Personal Access Token) with repo:write.
const organization = pm.collectionVariables.get("org"); // environment variable with GitHub username/organization name.
const repository = pm.collectionVariables.get("repository"); // environment variable with GitHub repository name. 

// ⬆️💡 The variables above you can paste directly in the script, if you don't want to use environment variables in Postman

// No need to change below this line ⬇️⛔

const authorizationHeader = `Authorization: Bearer ${ghToken}`;

const originalLabels = "https://api.github.com/repos/dotnetdevbr/vagas/labels"; // The source repository with existins labels
const createLabel = `https://api.github.com/repos/${organization}/${repository}/labels`; // The destination repository

pm.sendRequest( // ⏬ Get the existing labels of source repository
  {
    url: originalLabels,
    method: "GET",
    header: authorizationHeader
  },
  function (err, res) {
    const labels = res.json();
    for (let i = 0; i < labels.length; i++) { // 🔂 Iterate over labels of source repository 
    
      const label = labels[i];
      pm.sendRequest( // ⏫ Create the new label on the destination repository
        {
          url: createLabel,
          method: "POST",
          header: authorizationHeader,
          body: JSON.stringify({
            name: label.name,
            color: label.color,
            description: label.description,
          }),
        },
        function (err, res) {
          console.log(res);
        }
      );
      
    }
  }
);

How to use:

• Create a Postman request to GitHub (or anything else, doesn't matter the main request)
• Set up environment variables (or replace directly in the script)
  • org - the organization name (or the username of the owner of the repository)
  • repository - the repository name
  • GH_PAT - GitHub Personal Access Token (with write scope to desired org/repo)
• Copy the above code to test tab on the request
• Run the request
• All the labels from the dotnetdevbr/vagas repository will be copied to yours repository (with name, description and color properties)