---
title: tb dev
meta:
    description: Build your Tinybird project and watch for changes
---

# tb dev

Use `tb dev` to build your project and watch for changes. On each datafile change, the project rebuilds automatically.

For example:

```shell
tb dev

» Building project...
✓ datasources/user_actions.datasource created
✓ endpoints/user_actions_line_chart.pipe created
✓ endpoints/user_actions_total_widget.pipe created
✓ Rebuild completed in 0.2s

Watching for changes...
```

Run SQL queries and other commands in a separate terminal while `tb dev` is running:

```shell
tb sql "SELECT * FROM user_actions LIMIT 5"
tb endpoint ls
```

## Options

{% table %}
  * Option
  * Description
  ---
  * --with-connections
  * Creates data linkers for connection data sources (S3, Kafka, GCS).
  ---
  * --no-connections
  * Disables connector linker creation during `tb dev`.
{% /table %}

## UI access

When `tb dev` is running, Tinybird exposes your project in the Tinybird UI:

```bash
tb dev

» Exposing project to Tinybird UI...
* Access your project at https://cloud.tinybird.co/local/7181/your_workspace/project
```

## Developing with production data

You can develop with production data by pointing to a branch created with the `--last-partition` flag:

```bash
tb branch create my_feature_branch --last-partition
```

Then run:

```bash
tb --branch=my_feature_branch dev
```

## Environment support

{% table %}
  * Environment
  * Supported
  * Description
  ---
  * `--local`
  * ✓ Yes (default)
  * Starts a dev session in Tinybird Local.
  ---
  * `--cloud`
  * ✗ No
  * Dev sessions are not available in Tinybird Cloud.
  ---
  * `--branch=BRANCH_NAME`
  * ✓ Yes
  * Starts a dev session in a branch.
{% /table %}