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# Google Cloud Firestore Emulator
To develop and test your application locally, you can use the [Google Cloud
Firestore
Emulator](https://cloud.google.com/sdk/gcloud/reference/beta/emulators/firestore/),
which provides local emulation of the production Google Cloud Firestore
environment. You can start the Google Cloud Firestore emulator using
the `gcloud` command-line tool.
`gcloud beta emulators firestore start --host-port=0.0.0.0:8080`
When you run the Cloud Firestore emulator you will see a message similar to the
following printed:
```
If you are using a library that supports the FIRESTORE_EMULATOR_HOST
environment variable, run:
export FIRESTORE_EMULATOR_HOST=localhost:8080
```
Now you can connect to the emulator using the `FIRESTORE_EMULATOR_HOST`
environment variable:
```ruby
require "google/cloud/firestore"
# Make Firestore use the emulator
ENV["FIRESTORE_EMULATOR_HOST"] = "127.0.0.1:8080"
firestore = Google::Cloud::Firestore.new project_id: "emulator-project-id"
# Get a document reference
nyc_ref = firestore.doc "cities/NYC"
nyc_ref.set({ name: "New York City" }) # Document created
```
Or by providing the `emulator_host` argument:
```ruby
require "google/cloud/firestore"
firestore = Google::Cloud::Firestore.new project_id: "emulator-project-id",
emulator_host: "127.0.0.1:8080"
# Get a document reference
nyc_ref = firestore.doc "cities/NYC"
nyc_ref.set({ name: "New York City" }) # Document created
```
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