You have to use the built-in fs module to write the new JSON back to the
file. You want something like this:
const fs = require('fs');
fs.writeFile('./data.json', JSON.stringify(file), err => {
if (err) {
console.error(err);
} else {
console.log('It worked!');
}
});
On Sat, Mar 31, 2018 at 10:48 AM, <martinkovac...@gmail.com> wrote:
> Hi,
>
> I want to read and write json files. I'm new with nodejs so I don't have
> much experience.
> This is the content of my file and the structure:
>
> {
> "products": {
> "1234": {
> "states": {
> "STATEA": 0,
> "STATEB": 0,
> "STATEC": 0
> },
> "emailContacts": [
> "t...@test.de",
> "t...@test2.de"
> ]
> },
> "1256734": {
> "states": {
> "STATEA": 0,
> "STATEB": 0,
> "STATEC": 0
> },
> "emailContacts": [
> "t...@test.de",
> "t...@test2.de"
> ]
> }
> }
> }
>
> I use this file because actually I dont't use a database.
> Now I have a nodejs app which read states from receiving messages, if one
> state is not normal I want to change the value of the state in the json
> file ad save the state there. For this I tried this code:
>
> var file = require('./data.json')
> console.dir(file.products['1234'].states['STATEA']);
> file.products['1234'].states['STATEA']=5;
> console.dir(file.products['1234'].states['STATEA']);
>
> It seems to work, but after stopping the nodejs app and looking into the
> file there is no change in the file.
> I tried different things but I didn't find a solution. I think the problem
> is while running the app I only work on a copy of the file and not on the
> original file...
> I want to store the states in the file for a longer time. Later I want to
> use a database instead a json file.
>
> Thanks for help! :)
>
>
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