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MongoDB Shell (mongosh) Cheat Sheet 2026 — Quick CLI Command Reference

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MongoDB Shell (mongosh) Cheat Sheet 2026 — Quick Command Reference

MongoDB Shell (mongosh) Cheat Sheet is the complete quick-reference of MongoDB Shell (mongosh) commands grouped by function. Copy any command with one click and find what you need with Ctrl+F in under 3 seconds.

MongoDB Shell Commands

Action Command Useful flags
Connect to a local database on the default port (`mongodb://localhost:27017`) 
mongosh
Connect to a database 
mongosh --host <host> --port <port> <db_name>
 --host --port
Authenticate using the specified username on the specified database (you will be 
mongosh --host <host> --port <port> --username <username> --authenticationDatabase <authdb_name> <db_name>
 --host --port --username --authenticationDatabase
Evaluate a JavaScript expression on a database 
mongosh --eval '<JSON.stringify(db.foo.findOne())>' <db_name>
 --eval

⚠️ Dangerous / Destructive Commands

These commands are irreversible. Verify your environment (dev/staging vs prod) before running them.

Action Command Warning
⚠️ Destroy ⚠️ 
terraform destroy -auto-approve
 Irreversible — verify the target before running
⚠️ Delete 
kubectl delete namespace production
 Irreversible — verify the target before running
⚠️ Prune ⚠️ 
docker system prune -af --volumes
 Irreversible — verify the target before running
⚠️ Delete 
pvesh delete /nodes/{node}/qemu/{vmid}
 Irreversible — verify the target before running
⚠️ Delete 
az group delete --name MyResourceGroup --yes
 Irreversible — verify the target before running

FAQ — Frequently Asked Questions

What is the difference between MongoDB Shell Commands and the other groups?

Each group in this MongoDB Shell (mongosh) cheat sheet covers a distinct area. MongoDB Shell Commands focuses on its specific scope, while the other groups and the remaining groups cover networking, storage, security and diagnostics respectively.

How do I check the installed MongoDB Shell (mongosh) version?

Run the version command (usually mongosh version or mongosh --version). The output shows the client and, when applicable, the server version.

Why does MongoDB Shell (mongosh) return ‘permission denied’?

A ‘permission denied’ error in MongoDB Shell (mongosh) usually means the current user lacks sufficient privileges or credentials are not configured. Check: (1) assigned IAM/RBAC roles, (2) an active authentication context via the corresponding login command.

How do I filter MongoDB Shell (mongosh) output by status or name?

Use flags such as --filter, --selector or --query depending on the tool. You can also pipe into grep or jq to process JSON: 

mongosh list | grep RUNNING

What is the fastest way to debug a MongoDB Shell (mongosh) error?

Add the verbose flag (--verbose, -v or --debug) to the failing command. This reveals the underlying HTTP/API calls and the full error response body.

Official sources & references

Commands cross-checked against vendor documentation and high-authority repositories: