JSON output not showed correctly , javascript

Question

I create class in javascript to output config.json

const fs = require('fs');

class config {
    static put(input1,input2) {
        let json = {
            input1 , input2 }
        json = JSON.stringify(json);
        fs.writeFile('./config.json', json, (err) => {
            if (!err) {
                console.log('done');
            }
        });
    }
}

config.put('site_name', 'Blog');       
config.put('maintenance', false);   
config.put('age', 30);                  
config.put('meta', {"description": "lorem ipsum"});

will output config.json like this

{"input1":"meta","input2":{"description":"lorem ipsum"}}

i expect to output config.json

{ input1: 'site_name', input2: 'Blog' }
{ input1: 'maintenance', input2: false }
{ input1: 'age', input2: 30 }
{ input1: 'meta', input2: { description: 'lorem ipsum' } }

aren't you overwriting the file each time instead of appending into it? — zedling
– zedling, Commented May 29, 2018 at 7:31
Why do you call the file config.json when you don't store JSON in it? — str
– str, Commented May 29, 2018 at 7:35

zedling · Accepted Answer · 2018-05-29 07:33:48Z

1

Use append instead of write

const fs = require('fs');

class config {
    static put(input1,input2) {
        let json = { input1 , input2 };

        json = JSON.stringify(json);

        fs.appendFile('./config.json', json, (err) => {
            if (!err) {
                console.log('done');
            }
        });
    }
}

answered May 29, 2018 at 7:33

zedling

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Comments

Stephan Wiehr · Accepted Answer · 2018-05-29 07:37:46Z

0

Default options flag for writeFile is 'w' which will overwrite, you will need to specify 'a' for appending.

See here: https://nodejs.org/api/fs.html#fs_fs_writefile_file_data_options_callback and here for the file system flags: https://nodejs.org/api/fs.html#fs_file_system_flags

answered May 29, 2018 at 7:37

Stephan Wiehr

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