(JavaScript) Read/Write JSON with Binary Data such as JPEG Files

Demonstrates how binary files could be stored in JSON in base64 format. Creates JSON containing the contents of a JPG file, and then reads the JSON to extract the JPEG image.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

// First load a small JPG file..
var bd = new CkBinData();

success = bd.LoadFile("qa_data/jpg/starfish20.jpg");
// Assume success, but your code should check for success..

// Create JSON containing the binary data in base64 format.
var json1 = new CkJsonObject();
json1.UpdateBd("starfish","base64",bd);

var jsonStr = json1.Emit();
console.log(jsonStr);

// Here's the output:
// {"starfish":"/9j/4AAQSkZJRgA ... cN2iuLFsCEbDGxQkI6RO/n//2Q=="}

// Let's create a new JSON object, load it with the above JSON, and extract the JPG image..
var json2 = new CkJsonObject();
json2.Load(jsonStr);

// Get the binary bytes.
var bd2 = new CkBinData();
json2.BytesOf("starfish","base64",bd2);

// Save to a file.
success = bd2.WriteFile("qa_output/starfish20.jpg");

console.log("Success.");