缓存node.js json服务器数据

Question

I'm using the following json-server

var server = jsonServer.create()
var router = jsonServer.router('./books/db.json')
server.use(jsonServer.defaults())
server.use(router)
server.listen(3000)

I change db.json every 5 seconds

setInterval(function() {
    var o = JSON.parse(fs.readFileSync('./books/db.json', 'utf8'));
    for (var i = 0; i < o.books.length; i++) {
        // do some changes
    }
    fs.writeFile("./books/db.json", JSON.stringify(o));
}, 5000);

the file is changing but when doing a request, it stills has the old data

Answer 1

json-server uses lowdb internally for serving static files . lowdb won't reload your file on change as it is not watching the file for changes. The lowdb database is available at router.db , so you can use router.db.read('./books/db.json') to read your file again after changing it. See the lowdb docs for the API.

Alternatively, read the section of the json-server docs pertaining to generating random data . This solution avoids continual disk access, but your data will be lost after the server exits. If this is not an issue, this would the the way I would go.