Add E-Signatures to Express.js

Quick start

1. Get an API key from signb.ee (free, no credit card)
2. Set SIGNBEE_API_KEY in your environment
3. Add the code below to your app

Express.js example

const express = require("express");
const app = express();
app.use(express.json());

app.post("/send-contract", async (req, res) => {
  const response = await fetch("https://signb.ee/api/send", {
    method: "POST",
    headers: {
      Authorization: `Bearer ${process.env.SIGNBEE_API_KEY}`,
      "Content-Type": "application/json",
    },
    body: JSON.stringify(req.body),
  });
  res.json(await response.json());
});

app.listen(3000);

What happens

1. Your app sends markdown or a PDF URL to Signbee
2. Signbee generates a PDF (if markdown) and emails the recipient a signing link
3. Recipient signs — both parties receive the signed PDF with SHA-256 certificate

Also works with AI agents

Install the MCP server to let Claude, Cursor, or Windsurf send documents directly:

npx -y signbee-mcp