Basic serverless function logic

.gitignore

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+node_modules/
+.vercel
+.env

api/[owner]/[repo].js

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+const axios = require("axios");
+
+module.exports = (req, res) => {
+	const { owner, repo } = req.query;
+
+	axios
+		.get(`https://api.github.com/repos/${owner}/${repo}/deployments`)
+		.then((response) => {
+			if (response.data.length <= 0)
+				return res.status(404).json({
+					error: {
+						code: "not_found",
+						message: "The requested repository does not have any deployments.",
+					},
+				});
+
+			const vercelDeployments = response.data.filter(
+				(deployment) =>
+					deployment.creator.login === "vercel[bot]" &&
+					deployment.creator.html_url === "https://github.com/apps/vercel" &&
+					deployment.creator.type === "Bot"
+			);
+
+			if (vercelDeployments.length <= 0)
+				return res.status(404).json({
+					error: {
+						code: "not_found",
+						message:
+							"The requested repository does not have any Vercel deployments.",
+					},
+				});
+
+			const latest = vercelDeployments[0];
+
+			axios.get(latest.statuses_url).then((response) => {
+				if (response.data[0].state === "success")
+					return res.status(200).json({
+						url: "https://img.shields.io/badge/vercel-passing-success",
+					});
+				else if (response.data[0].state === "failure")
+					return res.status(200).json({
+						url: "https://img.shields.io/badge/vercel-failed-critical",
+					});
+				else if (response.data[0].state === "pending")
+					return res.status(200).json({
+						url: "https://img.shields.io/badge/vercel-pending-yellow",
+					});
+			});
+		})
+		.catch((error) => {
+			return res.status(error.response.status).json({
+				error: {
+					code: error.response.statusText.toLowerCase().replace(/ /gi, "_"),
+					message: "The requested repository does not have any deployments.",
+				},
+			});
+		});
+};

api/index.js

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+module.exports = (req, res) => {
+	res.json({
+		message: "Hello World!",
+	});
+};

package.json

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+{
+  "name": "vercel-badge",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "axios": "^0.21.0"
+  }
+}