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class="breadcrumbs__item"><span class="breadcrumbs__link">Contributing</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Running a Local Flask Backend</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h3 class="anchor anchorWithStickyNavbar_LWe7" id="flask-server">Flask server<a href="#flask-server" class="hash-link" aria-label="Direct link to Flask server" title="Direct link to Flask server"></a></h3><h4 class="anchor anchorWithStickyNavbar_LWe7" id="os-dependencies">OS Dependencies<a href="#os-dependencies" class="hash-link" aria-label="Direct link to OS Dependencies" title="Direct link to OS Dependencies"></a></h4><p>Make sure your machine meets the <a href="https://superset.apache.org/docs/installation/installing-superset-from-scratch#os-dependencies" target="_blank" rel="noopener noreferrer">OS dependencies</a> before following these steps. |
| You also need to install MySQL or <a href="https://mariadb.com/downloads" target="_blank" rel="noopener noreferrer">MariaDB</a>.</p><p>Ensure that you are using Python version 3.9 or 3.10, then proceed with:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic"># Create a virtual environment and activate it (recommended)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">python3 -m venv venv </span><span class="token comment" style="color:#999988;font-style:italic"># setup a python3 virtualenv</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token builtin class-name">source</span><span class="token plain"> venv/bin/activate</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic"># Install external dependencies</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">pip </span><span class="token function" style="color:#d73a49">install</span><span class="token plain"> -r requirements/testing.txt</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic"># Install Superset in editable (development) mode</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">pip </span><span class="token function" style="color:#d73a49">install</span><span class="token plain"> -e </span><span class="token builtin class-name">.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic"># Initialize the database</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic"># Note: For generating a SECRET_KEY if you haven't done already, you can use the command:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic"># echo "SECRET_KEY='$(openssl rand -base64 42)'" | tee -a superset_config.py</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">superset db upgrade</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic"># Create an admin user in your metadata database (use `admin` as username to be able to load the examples)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">superset fab create-admin</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic"># Create default roles and permissions</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">superset init</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic"># Load some data to play with.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic"># Note: you MUST have previously created an admin user with the username `admin` for this command to work.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">superset load-examples</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic"># Start the Flask dev web server from inside your virtualenv.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic"># Note that your page may not have CSS at this point.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token assign-left variable" style="color:#36acaa">FLASK_ENV</span><span class="token operator" style="color:#393A34">=</span><span class="token plain">development superset run -p </span><span class="token number" style="color:#36acaa">8088</span><span class="token plain"> --with-threads --reload --debugger</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Or you can install via our Makefile</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic"># Create a virtual environment and activate it (recommended)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">python3 -m venv venv </span><span class="token comment" style="color:#999988;font-style:italic"># setup a python3 virtualenv</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token builtin class-name">source</span><span class="token plain"> venv/bin/activate</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic"># install pip packages + pre-commit</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token function" style="color:#d73a49">make</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">install</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic"># Install superset pip packages and setup env only</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token function" style="color:#d73a49">make</span><span class="token plain"> superset</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic"># Setup pre-commit only</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token function" style="color:#d73a49">make</span><span class="token plain"> pre-commit</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p><strong>Note: the FLASK_APP env var should not need to be set, as it's currently controlled |
| via <code>.flaskenv</code>, however if needed, it should be set to <code>superset.app:create_app()</code></strong></p><p>If you have made changes to the FAB-managed templates, which are not built the same way as the newer, React-powered front-end assets, you need to start the app without the <code>--with-threads</code> argument like so: |
| <code>FLASK_ENV=development superset run -p 8088 --reload --debugger</code></p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="dependencies">Dependencies<a href="#dependencies" class="hash-link" aria-label="Direct link to Dependencies" title="Direct link to Dependencies"></a></h4><p>If you add a new requirement or update an existing requirement (per the <code>install_requires</code> section in <code>setup.py</code>) you must recompile (freeze) the Python dependencies to ensure that for CI, testing, etc. the build is deterministic. This can be achieved via,</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">$ python3 -m venv venv</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">$ </span><span class="token builtin class-name">source</span><span class="token plain"> venv/bin/activate</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">$ python3 -m pip </span><span class="token function" style="color:#d73a49">install</span><span class="token plain"> -r requirements/integration.txt</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">$ pip-compile-multi --no-upgrade</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h4 class="anchor anchorWithStickyNavbar_LWe7" id="logging-to-the-browser-console">Logging to the browser console<a href="#logging-to-the-browser-console" class="hash-link" aria-label="Direct link to Logging to the browser console" title="Direct link to Logging to the browser console"></a></h4><p>This feature is only available on Python 3. When debugging your application, you can have the server logs sent directly to the browser console using the <a href="https://github.com/betodealmeida/consolelog" target="_blank" rel="noopener noreferrer">ConsoleLog</a> package. You need to mutate the app, by adding the following to your <code>config.py</code> or <code>superset_config.py</code>:</p><div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">from</span><span class="token plain"> console_log </span><span class="token keyword" style="color:#00009f">import</span><span class="token plain"> ConsoleLog</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">def</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">FLASK_APP_MUTATOR</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">app</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> app</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">wsgi_app </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> ConsoleLog</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">app</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">wsgi_app</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> app</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">logger</span><span class="token punctuation" style="color:#393A34">)</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Then make sure you run your WSGI server using the right worker type:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token assign-left variable" style="color:#36acaa">FLASK_ENV</span><span class="token operator" style="color:#393A34">=</span><span class="token plain">development gunicorn </span><span class="token string" style="color:#e3116c">"superset.app:create_app()"</span><span class="token plain"> -k </span><span class="token string" style="color:#e3116c">"geventwebsocket.gunicorn.workers.GeventWebSocketWorker"</span><span class="token plain"> -b </span><span class="token number" style="color:#36acaa">127.0</span><span class="token plain">.0.1:8088 --reload</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>You can log anything to the browser console, including objects:</p><div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">from</span><span class="token plain"> superset </span><span class="token keyword" style="color:#00009f">import</span><span class="token plain"> app</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">app</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">logger</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">error</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">'An exception occurred!'</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">app</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">logger</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">info</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">form_data</span><span class="token punctuation" style="color:#393A34">)</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="frontend-assets">Frontend Assets<a href="#frontend-assets" class="hash-link" aria-label="Direct link to Frontend Assets" title="Direct link to Frontend Assets"></a></h3><p>See <a href="https://github.com/apache/superset/blob/master/CONTRIBUTING.md#frontend" target="_blank" rel="noopener noreferrer">Building Frontend Assets Locally</a></p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a 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