request-buffer

An HTTP Request Buffer for Node.js

Node RequestBuffer

RequestBuffer enables late binding to the data and end events for HTTP requests.

Binding to the standard data and end events in Node.js' http.ServerRequest can get complicated once your application needs to perform an async call (such as authenticating a user) before processing an HTTP request body.

// ... 
authenticateUser(function(authed) {
  if(authed) {
    request.on('data', function(chunk) {
      // It may be too late to bind at this point 
    });
  }
});

The simple solution is to always make sure you bind to the request events before any asynchronous functions are called. But passing the request data around and handling it properly can be difficult, especially when using a framework where the request data may need to be passed around by several methods.

RequestBuffer enables you to bind to the data event whenever you need without missing any data.

var requestBuffer = require('request-buffer');
// ... 
// Add the request buffer to the request object before any async calls 
server.request(function (reqres){
  // Add the buffer to the req object 
  req.buffer = new requestBuffer(req);
});
// ... 
authenticateUser(function(authed) {
  // Once you're done with async calls, attach to the buffer 
  req.buffer.attach();
 
  if(authed) {
    // Bind to the 'data' and 'end' events inside req.buffer 
    req.buffer.on('data', function(chunk) {
      // All your data will be emitted no matter where in the request we've attached 
    });
  }
});

npm install request-buffer