---
schema_version: 1
route: /t/mongosh.md
tool: "mongosh"
---

# sincecutoff.com /t/mongosh — mongosh

- name: mongosh
- kind: cli
- children: none
- homepage: <https://github.com/mongodb-js/mongosh>

Changes to the tools coding agents drive, since a model's training cutoff, each linked to its first-party source. Check installed versions and limitations before acting; a cutoff date does not establish what a model knows.
Original editorial content: [Apache 2.0](https://sincecutoff.com/v1/data-license.txt), by [0xPatrick](https://0xpatrick.dev). Preserve applicable license and [NOTICE](https://sincecutoff.com/notice.txt) attribution when redistributing. Third-party source text and examples retain their own rights. [License scope and attribution](https://sincecutoff.com/v1/license.json).
To stay current, read the changes feed: [`/v1/changes.md?tool=mongosh`](https://sincecutoff.com/v1/changes.md?tool=mongosh) (or `.json`), adding `since=YYYY-MM-DD` for your training cutoff. Entries for registered children are included; the registry itself is `/v1/tools.json`. How to page and save your place: [llms.txt](https://sincecutoff.com/llms.txt).

### mongosh shell API adds Session.bulkWrite() (2026-06-25)
- slug: mongosh-shell-api-adds-session-bulkwrite-426e19cadd41
- score: 0.90

How to use it:

When repository code needs to submit multiple MongoDB writes through a session, call `Session.bulkWrite(operations, options)` with an array of write-operation documents. The operation requires MongoDB 8.0 or later.

Examples:

```
const session = db.getMongo().startSession();
session.bulkWrite([
  { namespace: "<db>.<collection>", name: "insertOne", document: { <field>: <value> } },
  { namespace: "<db>.<collection>", name: "updateOne", filter: { <field>: <value> }, update: { $set: { <field>: <value> } } }
]);
```

- why_it_matters: When implementing repository code that needs to submit multiple MongoDB writes through a mongosh session, use the shell API bulk write method.
- sources: <https://github.com/mongodb-js/mongosh/releases/tag/v2.9.0>, <https://www.mongodb.com/docs/v8.0/reference/method/mongo.bulkwrite/>, <https://www.mongodb.com/docs/manual/reference/method/session/>
- gotchas: "Version: v2.9.0"; "operations (required): Array of write-operation documents. Each specifies a namespace, operation name, and operation-specific fields. Supported operations: insertOne, replaceOne, updateOne, updateMany, deleteOne, deleteMany."; "options: Options document; all documented sub-keys are optional: `ordered` (default true; stop at first error when true), `verboseResults` (default false), `bypassDocumentValidation` (default false), and `let` (document of values available as aggregation variables). No mutual exclusions are documented."; "namespace (required): Operation document key: database and collection for the write, in `<db>.<collection>` form."; "name (required): Operation document key: operation name, such as `insertOne` or `updateOne`."; "document (required): For `insertOne`, the document to insert."; "filter (required): For update, replace, and delete operations, the document selector for matching documents."; "update (required): For `updateOne` or `updateMany`, the update document or array of update documents."; "Prerequisite: Use a MongoDB 8.0 or later deployment. Create the session with `db.getMongo().startSession()` before calling the method."