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Verify Signature in PDF documents via Node.js SDK

API to verify signature in PDF documents using Aspose.PDF Cloud Node.js SDK

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Aspose.PDF Cloud Node.js SDK Aspose.PDF Cloud Node.js SDK

Overview

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How to verify signature in PDF documents via Node.js SDK

To verify signature in PDF, we’ll use Aspose.PDF Cloud Node.js SDK. This Cloud SDK assists Node.js programmers in developing cloud-based PDF creator, annotator, editor, and converter apps using Node.js programming language via Aspose.PDF REST API. Simply create an account at Aspose for Cloud and get your application information. Once you have the App SID & key, you are ready to give the Aspose.PDF Cloud Node.js SDK.

Package Manager Console Command


     
    npm install asposepdfcloud --save
     
     

Steps to verify signature in PDF via Cloud Node.js

Aspose.PDF Cloud developers can easily load & verify signature in PDF in just a few lines of code.

  1. Upload PDF Document
  2. Verify the Signature with the getVerifySignature() method
  3. Downloads the updated PDF file from the Aspose PDF Cloud storage.
 

Verify signature in PDF using Node.js


    import credentials from "../../../Credentials/credentials.json"  with { type: "json" };
    import fs from 'node:fs/promises';
    import path from 'node:path';
    import { PdfApi } from "../../src/api/api.js";


    const configParams = {
        LOCAL_FOLDER: "C:\\Samples\\",
        PDF_DOCUMENT_NAME: "sample-signed.pdf",
        SIGNATURE_NAME: 'sign1',
    }

    const pdfApi = new PdfApi(credentials.id, credentials.key);

    const pdfSignatures = {
        async uploadDocument () {
            const fileNamePath = path.join(configParams.LOCAL_FOLDER, configParams.PDF_DOCUMENT_NAME);
            const pdfFileData = await fs.readFile(fileNamePath);
            await pdfApi.uploadFile(configParams.PDF_DOCUMENT_NAME, pdfFileData);
            console.log("File '" + configParams.PDF_DOCUMENT_NAME + "' successfully uploaded!");
        },

        async verifySignature () {
            if (pdfApi)
            {
                const response = await pdfApi.getVerifySignature(configParams.PDF_DOCUMENT_NAME, configParams.SIGNATURE_NAME);

                if (response.body.code == 200) {
                    if (response.body.valid == true)
                        console.log("verifySignature(): Signature is VALID for the '" + configParams.PDF_DOCUMENT_NAME + "' document.");
                    else
                    console.log("verifySignature(): Signature is NOT VALID for the '" + configParams.PDF_DOCUMENT_NAME + "' document.");
                }
                else
                    console.error("verifySignature(): Failed to extract signatures in the document. Response code: " + response.body.code);
            }
        },
    }

    async function main() {
        try {
            await pdfSignatures.uploadDocument();
            await pdfSignatures.verifySignature();
        } catch (error) {
            console.error("Error:", error.message);
        }
    }
 

Work with Signature in PDF

Verifying a signature in a PDF is essential to ensure the document’s authenticity and integrity. It confirms that the content has not been altered since it was signed and that the signature was made by a trusted source. Signature verification is crucial in legal, financial, and business contexts where the validity of digital documents must be confirmed to prevent fraud and ensure compliance with regulations. Verify Signature in PDF documents with Aspose.PDF Cloud Node.js SDK.

With our Node.js library you can:

  • Add PDF document’s header & footer in text or image format.
  • Add tables & stamps (text or image) to PDF documents.
  • Append multiple PDF documents to an existing file.
  • Work with PDF attachments, annotations, & form fields.
  • Apply encryption or decryption to PDF documents & set a password.
  • Delete all stamps & tables from a page or entire PDF document.
  • Delete a specific stamp or table from the PDF document by its ID.
  • Replace single or multiple instances of text on a PDF page or from the entire document.
  • Extensive support for converting PDF documents to various other file formats.
  • Extract various elements of PDF files & make PDF documents optimized.
  • You can try out our free Apps to test the functionality online.