JavaScript Requires Chilkat v11.7.0+

Extract PDF Text to a StringBuilder and Save to a File

See more PDF Text Extraction Examples

Demonstrates ExtractTextSb, which writes the extracted text to a StringBuilder instead of returning it as a JSON string. Use it for large documents. The JSON output still receives the quality report. JavaScript

var success = false;

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  The PDF used in this example is available at long_report.pdf

var pdf = new CkPdf();
success = pdf.LoadFile("qa_data/pdf/long_report.pdf");
if (success == false) {
    console.log(pdf.LastErrorText);
    return;
}

console.log("Number of pages: " + pdf.NumPages);

//  ExtractTextSb takes the same operation and options as ExtractText, but the text
//  goes to a StringBuilder.  This avoids building a very large JSON string for
//  documents with many pages.
var json = new CkJsonObject();
var sbText = new CkStringBuilder();
var jsonOut = new CkJsonObject();

success = pdf.ExtractTextSb("text",json,sbText,jsonOut);
if (success == false) {
    console.log(pdf.LastErrorText);
    return;
}

console.log("Extracted " + sbText.Length + " characters.");

//  Save the text to a file.
success = sbText.WriteFile("qa_output/long_report.txt","utf-8",false);
if (success == false) {
    console.log(sbText.LastErrorText);
    return;
}

//  The JSON output does not contain the text, but it still has the quality report.
console.log("Quality: " + jsonOut.StringOf("quality.rating"));
console.log("Pages with no text (need OCR): [" + jsonOut.StringOf("quality.pagesNeedingOcr") + "]");

//  Sample output:

//  Number of pages: 3
//  Extracted 4522 characters.
//  Quality: good
//  Pages with no text (need OCR): []