Basic IP rate-limiting middleware for Express stored in MongoDB. Use to throttle or limit incoming request rate.
Let MongoDB do the heavy lifting and synchronization of throttling/rate-limiting requestors. This Express middleware registers and maintains a rate limit for each requesting IP address. It uses MongoDB's built-in expiration index to automatically sweep out expired Throttle records.
This rate-limiting implementation will scale across multiple servers with the same implementation.
var throttler = require('mongo-throttle');
// In Express-style app:
app.use(throttle());
// Optionally only rate-limit requests that begin with /api/
app.use('/api/', throttle());
// Optionally configure limits:
app.use(throttle({ rateLimit: { ttl: 600, max: 5 } }));
// Optionally configure a custom limit handler:
app.use(throttle(function(req, res, hits, remaining) {
var until = new Date((new Date()).getTime() + remaining);
res.statusCode = 420;
res.send('You shall not pass ' + hits + ' until ' + until + '!');
}));# Header fields set:
X-Rate-Limit-Limit # Maximum requests within TTL
X-Rate-Limit-Remaining # Requests remaining for IP
X-Rate-Limit-Reset # msec until limit reset for IP// Configuration options/defaults:
{
"rateLimit": {
"ttl": 600 // TTL window for each IP limit
"max": 600 // Max hits for IP within window
},
"response": {
"code": 429, // Response code when limit is reached
"message": "Rate Limit reached. Please wait and try again."
},
"mongoose":{
"uri": false // Optional Mongo URI connection string
},
"useCustomHeader": "x-custom-header" // Count hits by the distinct values found in this header, instead of by IP
}
// When using a custom limit handler:
/**
* Custom Limit-reached handler
*
* @param {object} req Express request
* @param {object} res Express response
* @param {number} hits Total hits for this IP within TTL
* @param {number} remaining msec reminaing before this IP resets TTL window
*/
function custom_limit(req, res, hits, remaining) {
// handler response here
}// Upon registration, this middleware will create
// a Mongoose model collection with schema:
Throttle = {
createdAt: Date,
ip: String,
hits: Number
}npm install mongo-throttle [--save]Mongo has a useful feature called a TTL index.
TTL collections make it possible to store data in MongoDB and have the mongod automatically remove data after a specified number of seconds or at a specific clock time.
You can tell Mongo to remove data for you! We will use this to remove expired request counts from our rate-limiting check. There are a couple important things to note about this feature:
- As an index, it is set upon collection creation. If you want to change it, you'll have to do so manually.
- The index-specific field,
expireAfterSeconds, is in seconds. Unlike most other timestamps in your JavaScript code, don't divide this by 1000.
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