---
title: "MongoDB Atlas"
description: "Local drop-in replacement services for CI and no-network sandboxes. Fully stateful, production-fidelity API emulation."
canonical_url: "https://emulate.dev/docs/mongoatlas"
---
# MongoDB Atlas

MongoDB Atlas emulation with Atlas Admin API v2 and Atlas Data API v1. In-memory document storage with CRUD, filtering, and aggregation.

## Admin API

### Projects

- `GET /api/atlas/v2/groups` — list projects
- `GET /api/atlas/v2/groups/:groupId` — get project
- `POST /api/atlas/v2/groups` — create project
- `DELETE /api/atlas/v2/groups/:groupId` — delete project (cascades clusters and data)

### Clusters

- `GET /api/atlas/v2/groups/:groupId/clusters` — list clusters
- `GET /api/atlas/v2/groups/:groupId/clusters/:clusterName` — get cluster
- `POST /api/atlas/v2/groups/:groupId/clusters` — create cluster
- `PATCH /api/atlas/v2/groups/:groupId/clusters/:clusterName` — update cluster
- `DELETE /api/atlas/v2/groups/:groupId/clusters/:clusterName` — delete cluster

### Database Users

- `GET /api/atlas/v2/groups/:groupId/databaseUsers` — list database users
- `GET /api/atlas/v2/groups/:groupId/databaseUsers/admin/:username` — get database user
- `POST /api/atlas/v2/groups/:groupId/databaseUsers` — create database user
- `DELETE /api/atlas/v2/groups/:groupId/databaseUsers/admin/:username` — delete database user

### Data Explorer

- `GET /api/atlas/v2/groups/:groupId/clusters/:clusterName/databases` — list databases
- `GET /api/atlas/v2/groups/:groupId/clusters/:clusterName/databases/:databaseName/collections` — list collections

## Data API

All operations via `POST` with JSON body specifying `dataSource`, `database`, and `collection`:

- `POST /app/data-api/v1/action/findOne` — find one document
- `POST /app/data-api/v1/action/find` — find many (filter, projection, sort, limit, skip)
- `POST /app/data-api/v1/action/insertOne` — insert one document
- `POST /app/data-api/v1/action/insertMany` — insert many documents
- `POST /app/data-api/v1/action/updateOne` — update one document (`$set`, upsert)
- `POST /app/data-api/v1/action/updateMany` — update many documents
- `POST /app/data-api/v1/action/deleteOne` — delete one document
- `POST /app/data-api/v1/action/deleteMany` — delete many documents
- `POST /app/data-api/v1/action/aggregate` — aggregation pipeline (`$match`, `$limit`, `$skip`, `$sort`, `$project`, `$count`)