The "limiter" package you mentioned is a lightweight Node.js package that provides a simple rate-limiting functionality. It allows you to limit the rate of requests to an API or server based on a specified number of requests per a defined time window.

To install the "limiter" package, you can use the following command in your Node.js project:

npm install limiter

Once installed, you can use the package in your Node.js application as demonstrated in the example provided on the npm page. Here's an example of how you can use the "limiter" package in a production-level application:

const Limiter = require('limiter');

// Create a new limiter instance
const limiter = new Limiter({
  tokensPerInterval: 100, // Maximum number of requests allowed per interval
  interval: 'minute', // The time interval for rate limiting (e.g., 'second', 'minute', 'hour')
});

// Sample route that needs rate limiting
app.get('/api/route', (req, res) => {
  // Check if the request exceeds the rate limit
  if (!limiter.tryRemoveTokens(1)) {
    // Return an error response if the rate limit is exceeded
    return res.status(429).json({ error: 'Rate limit exceeded' });
  }

  // Process the request if it is within the rate limit
  // Your code logic for handling the route goes here
});

In the above example, the "limiter" package is used to create a limiter instance with a limit of 100 requests per minute. The tryRemoveTokens() method is used to check if a token is available to process the request. If there are no tokens available, indicating that the rate limit has been exceeded, an error response is returned with a 429 status code.

Please note that the "limiter" package you mentioned appears to be a lightweight rate limiter implementation. While it may be suitable for simpler use cases, for more complex or production-level scenarios, you may consider using more feature-rich rate-limiting packages such as "express-rate-limit" or "koa-rate limit," which provide additional functionalities and integrations with popular frameworks.

I apologize for any confusion caused, and I hope this information helps you understand the usage of the "limiter" package.