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! :) > > > -- > Job board: http://jobs.nodejs.org/ > New group rules: https://gist.github.com/othiym23/9886289#file- > moderation-policy-md > Old group rules: https://github.com/joyent/node/wiki/Mailing-List- > Posting-Guidelines > --- > You received this message because you are subscribed to the Google Groups > "nodejs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to nodejs+unsubscr...@googlegroups.com. > To post to this group, send email to nodejs@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/nodejs/7e03a57f-0384-424f-97a1-9ed911b8a929%40googlegroups.com > <https://groups.google.com/d/msgid/nodejs/7e03a57f-0384-424f-97a1-9ed911b8a929%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- R. Mark Volkmann Object Computing, Inc. -- Job board: http://jobs.nodejs.org/ New group rules: https://gist.github.com/othiym23/9886289#file-moderation-policy-md Old group rules: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines --- You received this message because you are subscribed to the Google Groups "nodejs" group. To unsubscribe from this group and stop receiving emails from it, send an email to nodejs+unsubscr...@googlegroups.com. To post to this group, send email to nodejs@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/nodejs/CAFfRWnWV%2BSX5O6Sc3NNqn5iXSXUSn_sKj_mMgniRQb9V_KPuWQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.