express-cache-ctrl

Express middleware to handle Cache-Control header, this is used by browsers with HTTP 1.1 support to know about content expiration, and when to deliver content from navigator's cache. This is a huge performance improvement when loading content from a website.

Install

$ npm install express-cache-ctrl

Basic usage

var app = express();
var cache = require('express-cache-ctrl');
app.use('/api', cache.disable());

disable()

Returns a middleware you can use on express pipeline, to disable content caching.

secure()

Returns a middleware you can use on express pipeline, to disable content caching. This method is recomended by OWASP.

private([ttl], [options])

Returns the cache middleware using the given options and ttl. This middleware sets Cache-Control scope to private.

ttl

Cache Time-To-Live in seconds or in ms() notation. e.g. 1d

Options

private() accepts these properties in the options object.

ttl

Cache ttl in seconds (max-age). Defaults to 1h.

sttl

Shared cache ttl in seconds (s-maxage). Defaults to 1h.

mustRevalidate

Boolean to specify if content must be revalidated by the browser.

proxyRevalidate

Boolean to specify if content must be revalidated by proxy servers.

noTransform

Boolean to disable header transformation.

public([ttl], [options])

Returns the cache middleware using the given options and ttl. This middleware sets Cache-Control scope to public.

ttl

Cache Time-To-Live in seconds or in ms() notation. e.g. 1d

Options

public() accepts these properties in the options object.

ttl

Cache ttl in seconds (max-age). Defaults to 1h.

sttl

Shared cache ttl in seconds (s-maxage). Defaults to 1h.

mustRevalidate

Boolean to specify if content must be revalidated by the browser.

proxyRevalidate

Boolean to specify if content must be revalidated by proxy servers.

noTransform

Boolean to disable header transformation.

custom([options])

Returns the cache middleware using the given options.

Options

custom() accepts these properties in the options object.

scope

Sets the Cache-Control scope. Either public or private.

ttl

Cache ttl in seconds (max-age). Defaults to 1h.

sttl

Shared cache ttl in seconds (s-maxage). Defaults to 1h.

mustRevalidate

Boolean to specify if content must be revalidated by the browser.

proxyRevalidate

Boolean to specify if content must be revalidated by proxy servers.

noTransform

Boolean to disable header transformation.

noCache

Disables content caching and sets header to: no-cache, no-store.

Examples

express/connect

When using this module with express or connect, simply app.use the module as high as you like. Also it can be used in any stage in any express pipeline or route.

Setting default cache to private, and 1 hour to expiration.

var express = require('express');
var cache = require('express-cache-ctrl');

var app = express();

app.use(cache.private(3600)); // 1 min.

app.get('/hello', function(req, res) {
    res.json({hello: 'world!'});
});

Setting secure cache to specific route.

var express = require('express');
var cache = require('express-cache-ctrl');

var app = express();

app.get('/hello', cache.secure(), function(req, res) {
    res.json({hello: 'world!'});
});

For more examples, you can watch out, the unit tests for this module. test/cache.js

License

MIT