Cache Control for Dynamic Data Express.JS
The inelegant way is to simply add a call to res.set() prior to any JSON output. There, you can specify to set the cache control header and it will cache accordingly.
res.set('Cache-Control', 'public, max-age=31557600'); // one yearAnother approach is to simply set a res property to your JSON response in a route then use fallback middleware (prior to the error handling) to render and send the JSON.
app.get('/something.json', function (req, res, next) { res.JSONResponse = { 'hello': 'world' }; next(); // important! });// ...// Before your error handling middleware:app.use(function (req, res, next) { if (! ('JSONResponse' in res) ) { return next(); } res.set('Cache-Control', 'public, max-age=31557600'); res.json(res.JSONResponse);})Edit: Changed from res.setHeader to res.set for Express v4