javascript - How to add data to a json file? -

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i have json file (it mock object works database users):

[   {     "id": "0",     "username": "aaaaaaaaa",     "password": "xxxxxxxxx",   },   {     "id": "1",     "username": "bbbbbbbbb",     "password": "yyyyyyyyy",   },   {     "id": "2",     "username": "ccccccccc",     "password": "zzzzzzzzz",   } ]

i need add new users in json file. tryed use fs.appendfile function, append user after square bracket.

how can it?

you should load json file in memory, update array , save back. like:

var users = json.parse(fs.readfilesync('yourfile.json', 'utf8')); users.push({     "id": "10",     "username": "blabla",     "password": "passpass", }); fs.writefilesync('yourfile.json', json.stringify(users));

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