These scripts were developed to collection and process a "lighter" subset of stats

getMongoData/getMongoDataLite.js

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+//
+// Launch like:
+// mongo --quiet < getMongoDataLite.js > out.json
+//
+
+print("{");
+db.getMongo().getDBNames().forEach(function (name, idx, array) {
+    var mdb = db.getSiblingDB(name);
+    print("\"" + name + "\": { \n\t\t\"stats\":");
+    printjson(mdb.stats());
+    print("\n\t, \"collections\": [")
+    mdb.getCollectionNames().forEach(function(coll, idx2, array2) {
+        printjson(mdb.getCollection(coll).stats());
+        if (idx2 < array2.length - 1) print(",");
+    });
+    print("\t]\n}")
+    if (idx < array.length - 1) print(",");
+});
+print("\n}");

getMongoData/processLite.js

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+/**
+* Launch with `node processLite.js` or `node processList.js <MYFILE.json>`
+*/
+
+var markdown = true; // include markdown summary table
+var args = process.argv.slice(2);
+var filename = args.length > 0 ? args[0] : 'out.json';
+
+console.log(`Reading data from ${filename}`);
+
+var fs = require('fs');
+var content = fs.readFileSync(filename, 'utf8');
+
+content = content.replace(/Timestamp\(.*\)/g, '1');
+content = content.replace(/NumberLong\((.*)\)/g, '$1');
+content = content.replace(/ObjectId\((.*)\)/g, '$1');
+
+var json = JSON.parse(content);
+
+dbs = [];
+collections = []; // collection names
+// collection via DB and collection (and assert they are the same)
+objectsViaDb = 0;
+bytesViaDb = 0; // data size
+indexSizeTotal = 0;
+storageSizeTotal = 0;
+
+objectsViaColls = 0; // total objects in ALL databases/collections
+bytesViaColls = 0;
+
+if (markdown) {
+  console.log(`| Database | dataSize | storageSize | indexSize |`);
+  console.log(`| ---- | ---: | ---: | ----: |`);
+}
+Object.keys(json).forEach(function(key) {
+  if (key != 'admin'  && key != 'config') {
+    dbs.push(key);
+    var elem = json[key];
+    // collection via db.stats()
+    objectsViaDb += elem.stats.objects;
+    bytesViaDb += elem.stats.dataSize;
+    // console.log(`dataSize ${key}: ${(elem.stats.dataSize/1024/1024/1024).toFixed(1)}GB`)
+    indexSizeTotal += elem.stats.indexSize;
+    // console.log(`indexSize ${key}: ${(elem.stats.indexSize/1024/1024/1024).toFixed(1)}GB`)
+    storageSizeTotal += elem.stats.storageSize;
+    // console.log(`storageSize ${key}: ${(elem.stats.storageSize/1024/1024/1024).toFixed(1)}GB`)
+    if (markdown)
+      console.log(`| ${key} | ${(elem.stats.dataSize/1024/1024/1024).toFixed(1)} | ${(elem.stats.storageSize/1024/1024/1024).toFixed(1)} | ${(elem.stats.indexSize/1024/1024/1024).toFixed(1)} | `)
+    // same for getCollectionNames
+    elem.collections.forEach(function(coll) {
+      collections.push(coll.ns);
+      objectsViaColls += coll.count;
+      bytesViaColls += coll.size;
+    });
+}
+});
+
+console.log(`{\n` +
+  `\tdbs: ${JSON.stringify(dbs)},\n`+
+  `\tdbCount: ${dbs.length},\n`+
+  `\tcolls: ${JSON.stringify(collections)},\n`+
+  `\tcollCount: ${collections.length},\n`+
+  `\tobjectsViaDb: ${objectsViaDb},\n`+
+  `\tobjectsViaColls: ${objectsViaColls},\n`+
+  `\tbytesViaDb: {\n`+
+  `\t\traw: ${bytesViaDb},\n`+
+  `\t\tgb: ${bytesViaDb/1024/1024/1024}\n`+
+  `\t},\n` +
+  `\tbytesViaColls: {\n`+
+  `\t\traw: ${bytesViaColls},\n`+
+  `\t\tgb: ${(bytesViaColls/1024/1024).toFixed(0)}\n`+
+  `\t},\n` +
+  `\tindexSizeTotal: {\n`+
+  `\t\traw: ${indexSizeTotal},\n`+
+  `\t\tgb: ${(bytesViaColls/1024/1024).toFixed(0)},\n`+
+  `\t},\n` +
+  `\tstorageSizeTotal: {\n`+
+    `\t\traw: ${storageSizeTotal},\n`+
+      `\t\tgb: ${(storageSizeTotal/1024/1024).toFixed(0)},\n`+
+      `\t},\n` +
+  `}`);