Node.js

Extract data:image/png;base64 from HTML

See more Base64 Examples

Demonstrates how to extract base64 image data from HTMl and save to files. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    var sb = new chilkat.StringBuilder();
    var bd = new chilkat.BinData();
    var sbFilename = new chilkat.StringBuilder();
    var index = 1;

    success = sb.LoadFile("qa_data/html/oresp body.txt","utf-8");
    // Assume success.
    console.log("length = " + sb.Length);

    var mayHaveMore = true;
    while (mayHaveMore == true) {

        // Get the base64 between the 1st occurrence "data:image/png;base64," and "'"
        var sBase64 = sb.GetBetween("data:image/png;base64,","'");

        // If nothing is found, then we'll exit the loop because there are no more.
        mayHaveMore = sb.LastMethodSuccess;

        if (sb.LastMethodSuccess == true) {
            // Found something.
            // Load into bd and save.
            success = bd.LoadEncoded(sBase64,"base64");

            sbFilename.SetString("qa_output/png_");
            sbFilename.AppendInt(index);
            sbFilename.Append(".png");

            bd.WriteFile(sbFilename.GetAsString());

            // Replace "data:image/png;base64" with "data:image-png;base64" so the next iteration finds the next occurrence.
            sb.ReplaceFirst("data:image/png;base64","data:image-png;base64");
        }

        index = index+1;
    }

    // Restore our replacements..
    var count = sb.Replace("data:image-png;base64","data:image/png;base64");

    console.log("All done.");

}

chilkatExample();