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examples/node/getinfo.mjs

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+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+//
+// Basic node example that prints document metadata and text content.
+//
+
+// Run `gulp dist-install` to generate 'pdfjs-dist' npm package files.
+import { getDocument } from "pdfjs-dist/legacy/build/pdf.mjs";
+
+// Loading file from file system into typed array
+const pdfPath =
+  process.argv[2] || "../../web/compressed.tracemonkey-pldi-09.pdf";
+
+// Will be using promises to load document, pages and misc data instead of
+// callback.
+const loadingTask = getDocument(pdfPath);
+loadingTask.promise
+  .then(function (doc) {
+    const numPages = doc.numPages;
+    console.log("# Document Loaded");
+    console.log("Number of Pages: " + numPages);
+    console.log();
+
+    let lastPromise; // will be used to chain promises
+    lastPromise = doc.getMetadata().then(function (data) {
+      console.log("# Metadata Is Loaded");
+      console.log("## Info");
+      console.log(JSON.stringify(data.info, null, 2));
+      console.log();
+      if (data.metadata) {
+        console.log("## Metadata");
+        console.log(JSON.stringify(data.metadata.getAll(), null, 2));
+        console.log();
+      }
+    });
+
+    const loadPage = function (pageNum) {
+      return doc.getPage(pageNum).then(function (page) {
+        console.log("# Page " + pageNum);
+        const viewport = page.getViewport({ scale: 1.0 });
+        console.log("Size: " + viewport.width + "x" + viewport.height);
+        console.log();
+        return page
+          .getTextContent()
+          .then(function (content) {
+            // Content contains lots of information about the text layout and
+            // styles, but we need only strings at the moment
+            const strings = content.items.map(function (item) {
+              return item.str;
+            });
+            console.log("## Text Content");
+            console.log(strings.join(" "));
+            // Release page resources.
+            page.cleanup();
+          })
+          .then(function () {
+            console.log();
+          });
+      });
+    };
+    // Loading of the first page will wait on metadata and subsequent loadings
+    // will wait on the previous pages.
+    for (let i = 1; i <= numPages; i++) {
+      lastPromise = lastPromise.then(loadPage.bind(null, i));
+    }
+    return lastPromise;
+  })
+  .then(
+    function () {
+      console.log("# End of Document");
+    },
+    function (err) {
+      console.error("Error: " + err);
+    }
+  );