Skip to content

Backup mongo indexes

There is really short and briliant script for create backup of indexes queries. This code iterate over all collections and create backup of createIndex() queries.

print(`// Backup indexes of : ${db.getName()} : database`);
print(`use ${db.getName()};`);
db.getCollectionNames().forEach(function (collection) {
indexes = db
.forEach(function (index) {
if ( === "_id_") return; // skip defalut _id indexes
const keys = tojsononeline(index.key);
delete index.key;
delete index.v;
delete index.ns;
print(`db.${collection}.createIndex(${keys}, ${tojsononeline(index)});`);

You can save this backup code to file and run int directly with mongoshell command:

Terminal window
mongo --quiet mongodb://localhost:27017/mydb ./backup.indexes.js > myindexes.js

Example output:

{ settings: 1 },
{ name: "settingsIndex", background: true },
db.users.createIndex({ name: 1 }, { name: "nameIndex", background: true });
db.users.createIndex({ email: 1 }, { name: "emailIndex", background: true });