---
id: dagster-webserver
version: "1.13.17"
license: Apache-2.0
license_treatment: permissive
maintenance: active
---

# dagster-webserver — Web UI for dagster.

License: permissive · Maintenance: active · Downloads: 8.0M/mo

## What it is and what it does

Dagster-webserver is the web UI component of Dagster, a cloud-native data orchestration platform. It provides a browser-based interface for visualizing, monitoring, and managing data assets and pipelines defined in Dagster. The webserver runs on top of the core dagster package and uses starlette and uvicorn to serve a dynamic web application that displays asset lineage, execution history, and observability data.

You install it alongside dagster to gain a graphical view of your data workflows. Once your assets are defined as Python functions decorated with @dg.asset, the webserver displays them as an interactive graph, tracks their execution, and surfaces metadata and logs. It's designed to work across the full development lifecycle—from local testing through production—and integrates with Dagster's declarative asset model and built-in observability features.

Use it for:

- Visualize and monitor data asset dependencies and execution status in a centralized dashboard.
- Debug data pipeline failures by inspecting logs, lineage, and asset metadata through the UI.
- Track data quality and performance metrics across your asset graph in real time.
- Manage and trigger manual runs of assets or jobs from a browser without writing code.
- Explore asset lineage and understand how data flows through your organization's pipelines.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Provides a web UI for Dagster, a data pipeline orchestrator that manages asset definitions, execution, and observability through a browser-based interface.

Yes. Dagster-webserver is actively maintained, has no known vulnerabilities, and installs with low friction. If you are using Dagster for data orchestration, the webserver is the standard UI layer and worth installing to gain visibility into your pipelines. The permissive Apache 2.0 license poses no barrier to adoption.

## Install

pip install dagster-webserver
uv add dagster-webserver
poetry add dagster-webserver

## Installing dagster-webserver

Before you install: Low friction installation with a wheel distribution. Active maintenance—released 7 days ago with a recent commit history and no known vulnerabilities. Depends on five runtime packages including dagster, starlette, and uvicorn.

License in practice: Apache 2.0 permissive license allows commercial and private use with minimal restrictions; you must retain license notices in distributions.

Quickstart:

pip install dagster-webserver

import dagster as dg
from dagster_webserver import webserver

# After defining assets with @dg.asset, run:
webserver.start()

Requires Python 3.10 or later (supports up to 3.14). Dagster core package must be installed and assets defined before the webserver can serve them.

Verify before relying:

- Whether the webserver requires specific configuration or environment variables to connect to a Dagster instance.
- Performance characteristics and resource requirements for serving large asset graphs or high-frequency updates.

## Package facts

- License: Apache-2.0 (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 8.0M/month (top 5,000 on PyPI)
- Known vulnerabilities: none known

## Tags

dagster web ui, data pipeline orchestration interface, asset lineage visualization, data orchestration dashboard, pipeline monitoring ui, dagster webserver, data asset management interface, data-orchestration, observability, web-ui

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