node.js json-server data are cached

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

sabrehagen · Accepted Answer · 2016-03-01 00:41:21Z

4

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.

answered Mar 1, 2016 at 0:41

sabrehagen

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