tls

Last updated Apr 23, 2026 Note

For compatibility dates of 2026-08-04 or later, Workers enables both nodejs_compat and nodejs_compat_v2 by default. These flags are not used for these compatibility dates. Existing projects do not need to remove them when updating their compatibility date. For earlier dates, add nodejs_compat to your Wrangler configuration file to opt in. For instructions to turn off Node.js compatibility, refer to the Node.js compatibility flag.

You can use node:tls ↗︎ to create secure connections to external services using TLS ↗︎ (Transport Layer Security).

import { connect } from "node:tls";

// ... in a request handler ...
const connectionOptions = { key: env.KEY, cert: env.CERT };
const socket = connect(url, connectionOptions, () => {
    if (socket.authorized) {
        console.log("Connection authorized");
    }
});

socket.on("data", (data) => {
    console.log(data);
});

socket.on("end", () => {
    console.log("server ends connection");
});

The following APIs are available:

All other APIs, including tls.Server ↗︎ and tls.createServer ↗︎, are not supported and will throw a Not implemented error when called.

The full node:tls API is documented in the Node.js documentation for node:tls ↗︎.

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