How Can I Compress JSON Data in JavaScript for Server-Side Caching?

JavaScript Gzip Implementation

This discussion focuses on finding a JavaScript implementation of Gzip for compression purposes. The goal is to reduce the size of stored JSON data before sending it to a server-side cache.

Possible Alternative: LZW Compression

Although a JavaScript implementation of Gzip was not found, the jsolait library offers LZW compression and decompression functions. LZW is a lossless data compression algorithm that can shrink the size of data effectively.

Code Samples for LZW Encoding and Decoding

// LZW Compression Function
function lzw_encode(s) {
  // Initialize variables
  var dict = {};
  var data = (s + "").split("");
  var out = [];

  // Iterate through characters
  for (var i = 0; i < data.length; i++) {
    // Check for existing code
    if (!dict.hasOwnProperty(data[i])) {
      // Encode and update dictionary
      dict[data[i]] = out.length;
      out.push(data[i]);
    }
  }

  // Return encoded string
  return out;
}

// LZW Decompression Function
function lzw_decode(s) {
  // Initialize variables
  var dict = {};
  var data = (s + "").split("");
  var out = [];

  // Add first character to dictionary
  dict[""] = data[0];

  // Iterate through codes
  for (var i = 1; i < data.length; i++) {
    // Check dictionary for code
    if (!dict.hasOwnProperty(data[i])) {
      // If code exists for previous character, append previous character to previous phrase
      var phrase = dict[data[i - 1]];
      dict[data[i]] = phrase + phrase.charAt(0);
    } else {
      // Add to dictionary and output
      dict[data[i]] = phrase + data[i];
      out.push(dict[data[i]]);
    }
  }

  // Return decoded string
  return out.join("");
}

The above is the detailed content of How Can I Compress JSON Data in JavaScript for Server-Side Caching?. For more information, please follow other related articles on the PHP Chinese website!