Node.js

Using Logfire in your Node.js script is straightforward. You need to get a write token, install the package, configure it, and use the provided API.

Let's create an empty project:

mkdir test-logfire-js
cd test-logfire-js
npm init -y es6 # This creates a package.json with `type: module` for ES6 support
npm install @pydantic/logfire-node

Then, create the following hello.js script in the directory:

import * as logfire from "@pydantic/logfire-node";

logfire.configure({
  token: "your-write-token",
  serviceName: "example-node-script",
  serviceVersion: "1.0.0",
});

logfire.info(
  "Hello from Node.js",
  {
    "attribute-key": "attribute-value",
  },
  {
    tags: ["example", "example2"],
  },
);

Run the script with node hello.js, and you should see the span appear in the live view of your Logfire project.

A working example can be found in the examples/node directory of the logfire-js repository.