How to send large json data in ajax request

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How to send large JSON data in AJAX request

When sending large JSON data in an AJAX request, you need to consider a few things to ensure the data is sent efficiently and without any issues. Here are the steps you can follow with an example:

  1. Break down the large JSON data into smaller chunks or subsets for easier processing.
  2. Use the JSON.stringify() method to convert the JSON object to a string format.
  3. Send the stringified JSON data using an AJAX request.
  4. On the server-side, handle the request and parse the JSON string back into its original JSON format.

Let’s see an example of how to apply these steps in JavaScript:

Suppose we have a large JSON object called ‘bigData’ that we want to send via AJAX: 

    var bigData = {
      // ... large JSON data ...
    };

To send this large JSON data, we can break it down into smaller subsets using a loop and send each subset individually. Here’s an example using the jQuery library:

    var chunkSize = 100; // Number of items to include in each chunk
    var chunks = Math.ceil(Object.keys(bigData).length / chunkSize); // Calculate number of chunks

    for (var i = 0; i < chunks; i++) {
      var start = i * chunkSize;
      var end = (i + 1) * chunkSize;
      var subset = {};

      Object.keys(bigData).slice(start, end).forEach(function(key) {
        subset[key] = bigData[key];
      });

      // Send each subset using AJAX
      $.ajax({
        url: 'your_url',
        method: 'POST',
        data: JSON.stringify(subset),
        contentType: 'application/json',
        success: function(response) {
          // Handle success response
          console.log(response);
        },
        error: function(error) {
          // Handle error response
          console.log(error);
        }
      });
    }

In this example, we determine the number of chunks based on the total number of keys in the 'bigData' object and the desired chunk size. We then iterate through each chunk, create a subset of data, and send it via AJAX using the jQuery.ajax() method. The subset is converted to a JSON string using JSON.stringify() and set as the data in the AJAX request. The contentType is set to 'application/json' to ensure the server handles it as JSON data.

On the server-side, you need to handle the AJAX request and parse the received JSON data. The exact implementation depends on the server-side technology you are using. For example, in a Node.js server, you can use the 'body-parser' middleware to parse the JSON data:

    const express = require('express');
    const bodyParser = require('body-parser');
    const app = express();

    app.use(bodyParser.json());

    // Handle the AJAX request
    app.post('/your_url', (req, res) => {
      const subset = req.body;

      // Process the received JSON subset
      // ...

      res.send('Success'); // Send a response back to the client
    });

    app.listen(3000, () => {
      console.log('Server is running on port 3000');
    });

In this Node.js example, the 'body-parser' middleware is used to parse the JSON data from the AJAX request's body. The received subset can then be processed as needed.

By breaking down the large JSON data into smaller chunks and sending them individually, you can ensure a smooth transmission and avoid any request payload size limitations.

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