Store the arrays in a JSON file before utilizing Array.push() to append data into it

Question

Store the arrays in a JSON file before utilizing Array.push() to append data into it

I'm currently developing a calendar software and I want to store events in a JSON file. My strategy involves nesting arrays within arrays in the JSON format, allowing for easy iteration and loading during program initialization.

My main question is: how can I add an array into another array in JSON? Any tips on this issue? For instance, if I have a variable var event containing an array such as

{"id": elementTitle, "year": year, "month": month, "day": day};

which will be stringified using JSON.stringify(event), how do I append it to an existing array in a JSON file like: events = { }.

Just to add, this application is built using the electron API and powered by node.js.

javascript html css arrays json

Answer 1

Answer №1

You may consider implementing this approach.

Specify events using [] to indicate that it is an array.

//file.json

{
  "events":[]
}

Utilize the node filesystem or "fs" module to interact with your file. The code snippet below demonstrates asynchronous reading and writing, allowing the application to continue running without pauses - although synchronous options are also available.

//app.js

let fs = require('fs');

fs.readFile('/path/to/local/file.json', 'utf8', function (err, data) {
   if (err) {
       console.log(err)
   } else {
       const file = JSON.parse(data);
       file.events.push({"id": title1, "year": 2018, "month": 1, "day": 3});
       file.events.push({"id": title2, "year": 2018, "month": 2, "day": 4});

       const json = JSON.stringify(file);

       fs.writeFile('/path/to/local/file.json', json, 'utf8', function(err){
            if(err){ 
                  console.log(err); 
            } else {
                  //All operations completed successfully!
            }});
   }

});

Further examples

Answer 2

You may consider implementing this approach.

Specify events using [] to indicate that it is an array.

//file.json

{
  "events":[]
}

Utilize the node filesystem or "fs" module to interact with your file. The code snippet below demonstrates asynchronous reading and writing, allowing the application to continue running without pauses - although synchronous options are also available.

//app.js

let fs = require('fs');

fs.readFile('/path/to/local/file.json', 'utf8', function (err, data) {
   if (err) {
       console.log(err)
   } else {
       const file = JSON.parse(data);
       file.events.push({"id": title1, "year": 2018, "month": 1, "day": 3});
       file.events.push({"id": title2, "year": 2018, "month": 2, "day": 4});

       const json = JSON.stringify(file);

       fs.writeFile('/path/to/local/file.json', json, 'utf8', function(err){
            if(err){ 
                  console.log(err); 
            } else {
                  //All operations completed successfully!
            }});
   }

});

Further examples

Answer 3

Answer №2

In my code, I have a variable called event which is set to an object {"id": elementTitle, "year": year, "month": month, "day": day}

Just to clarify, this data structure is actually an object, not an array.

To update a JSON file that has been saved to disk, you would need to read the file from disk, parse it using JSON.parse to convert it into a JavaScript object (or array), make your modifications, and then overwrite the file with the updated object (or array).

Answer 4

In my code, I have a variable called event which is set to an object {"id": elementTitle, "year": year, "month": month, "day": day}

Just to clarify, this data structure is actually an object, not an array.

To update a JSON file that has been saved to disk, you would need to read the file from disk, parse it using JSON.parse to convert it into a JavaScript object (or array), make your modifications, and then overwrite the file with the updated object (or array).

Store the arrays in a JSON file before utilizing Array.push() to append data into it

Answer №1

Answer №2

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