GroupDocs.Signature for Node.js via Java lets your app end-users sign the electronic documents from a wide range of file formats. Supports several types of e-signing methods.

Node.js Signature API Features

• Document Signature Processing Features
• Create and add signatures to documents of various file formats.
• Specify visual attributes of signatures, such as color, font, margins, etc.
• Search and fetch a list of signatures from a document.
• Determine if the document contains signatures meeting specified criteria.
• Extract basic information about the document.
• Generate image representation of document pages for preview.
• Distinguish created signatures from the actual document.
• Put encrypted text into the QR-code signature or embed custom data objects.

Supported File Formats

The following section lists the supported file formats for the barcode, image, QR-code, stamp, and text signature types: Microsoft Word: DOC, DOCM, DOCX, DOT, DOTM, DOTX Microsoft Excel: XLSX, XLS, XLSB, XLSM, XLTX, XLTM Microsoft PowerPoint: PPTX, PPTM, PPT, PPSX, PPSM, PPS, POTX, POTM OpenOffice: ODT, OTT, ODS, OTS, ODP, OTP Image: BMP, DJVU, GIF, JPG, JPEG, PNG, SVG, TIF, TIFF, WEBP CorelDraw: CDR, CMX Photoshop: PSD Metafile: WMF Portable: PDF

Digital Signature Supported Formats

Microsoft Word: DOC, DOCM, DOCX, DOT, DOTM, DOTX Microsoft Excel: XLSX, XLS, XLSB, XLSM, XLTX, XLTM Microsoft PowerPoint: PPTX, PPTM OpenOffice: ODS, OTS Portable: PDF

Supported Signature Types

• Text stamps
• Text labels
• Text as an image signature
• Image signature
• Digital signature
• Barcode signature
• QR-code signature
• Metadata signature
• Form-field signature

Getting Started with GroupDocs.Signature for Node.js via Java

Installation

From the command line:

npm i @groupdocs/groupdocs.signature

Sign a PDF File using Node.js

  const signature = new groupdocs.signature.Signature(pdfFilePath);

  // Create QR code sign options
  const options = new groupdocs.signature.QrCodeSignOptions('JohnSmith');

  // Setup QR code encoding type
  options.setEncodeType(groupdocs.signature.QrCodeTypes.QR);
  
  // Set signature position
  options.setLeft(100);
  options.setTop(100);

  // Sign document to file
  signature.sign(outputFilePath, options);

Search for Digital Signatures in Excel XLSX using Node.js

const signature = new groupdocs.signature.Signature('spreadsheet.xlsx');
const options = new groupdocs.signature.DigitalSearchOptions();

// Search for signatures in the document
const signatures = signature.search(options).toArray();

console.log('\nSource document contains the following signatures.');
for (const digitalSignature of signatures) {
  console.log(`Digital signature found from ${digitalSignature.signTime} with validation flag ${digitalSignature.isValid}. Certificate SN ${digitalSignature.certificate.type}`);
}

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