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<title data-rh="true">Console output | DeviceScript</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://microsoft.github.io/devicescript/developer/console"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-default-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-current"><meta data-rh="true" property="og:title" content="Console output | DeviceScript"><meta data-rh="true" name="description" content="Learn how to use console functionality in DeviceScript to add logging to your script and how to use format strings to write registers."><meta data-rh="true" property="og:description" content="Learn how to use console functionality in DeviceScript to add logging to your script and how to use format strings to write registers."><meta data-rh="true" name="keywords" content="DeviceScript,console,logging,format strings,registers"><link data-rh="true" rel="icon" href="/devicescript/img/favicon.svg"><link data-rh="true" rel="canonical" href="https://microsoft.github.io/devicescript/developer/console"><link data-rh="true" rel="alternate" href="https://microsoft.github.io/devicescript/developer/console" hreflang="en"><link data-rh="true" rel="alternate" href="https://microsoft.github.io/devicescript/developer/console" hreflang="x-default"><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.13.24/dist/katex.min.css" integrity="sha384-odtC+0UGzzFL/6PNoE8rX/SPcQDXBJ+uRepguP4QkPCm2LBxH3FA3y+fKSiJ+AmM" crossorigin="anonymous"><link rel="stylesheet" href="/devicescript/assets/css/styles.83f5432f.css">
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markdown"><h1>Console output</h1><p>DeviceScript supports basic <code>console</code> functionality which allows you to add logging to your script.</p><div class="language-ts codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-ts codeBlock_RMoD thin-scrollbar"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#393A34"><span class="token builtin">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">debug</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#C6105F">"debug"</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"></span><span class="token builtin">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">log</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#C6105F">"log"</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"></span><span class="token builtin">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">warn</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#C6105F">"warn"</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"></span><span class="token builtin">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">error</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#C6105F">"error"</span><span class="token punctuation" style="color:#393A34">)</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><path fill="currentColor" 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 viewBox="0 0 24 24" class="copyButtonSuccessIcon_L0B6"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>The console output will be visible in the DeviceScript terminal window.</p><h2 class="anchor anchorWithHideOnScrollNavbar_pMLv" id="console-data">Console data<a href="#console-data" class="hash-link" aria-label="Direct link to Console data" title="Direct link to Console data"></a></h2><p><code>console.data</code> is a special purpose function to log sensor data. A timestamp (<code>ds.millis()</code>) is automatically added by the runtime.</p><div class="language-ts codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-ts codeBlock_RMoD thin-scrollbar"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#CF222E">const</span><span class="token plain"> temp </span><span class="token operator" style="color:#D73A49">=</span><span class="token plain"> </span><span class="token number" style="color:#005CC5">20</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#CF222E">const</span><span class="token plain"> humi </span><span class="token operator" style="color:#D73A49">=</span><span class="token plain"> </span><span class="token number" style="color:#005CC5">60</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 builtin">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">data</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"> temp</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> humi </span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">)</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><path fill="currentColor" 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 viewBox="0 0 24 24" class="copyButtonSuccessIcon_L0B6"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>In Visual Studio Code, you will find the data in the <strong>DeviceScript - Data</strong>
output pane or you can download it from the view menu.</p><p><img loading="lazy" alt="console data icon" src="/devicescript/assets/images/consoledata-82fce9648a2c3463633acc673722b334.png" width="372" height="355" class="img_SS3x"></p><p>The following Visual Studio Code extensions are recommended for a best experience:</p><ul><li><a href="https://marketplace.visualstudio.com/items?itemName=ms-toolsai.jupyter" target="_blank" rel="noopener noreferrer">Jupyter</a></li><li><a href="https://marketplace.visualstudio.com/items?itemName=ms-toolsai.jupyter-renderers" target="_blank" rel="noopener noreferrer">Jupyter Renderers</a></li><li><a href="https://marketplace.visualstudio.com/items?itemName=ms-python.python" target="_blank" rel="noopener noreferrer">Python</a></li><li><a href="https://marketplace.visualstudio.com/items?itemName=ms-python.vscode-pylance" target="_blank" rel="noopener noreferrer">PyLance</a></li><li><a href="https://marketplace.visualstudio.com/items?itemName=mechatroner.rainbow-csv" target="_blank" rel="noopener noreferrer">Raibow CSV</a></li></ul><h2 class="anchor anchorWithHideOnScrollNavbar_pMLv" id="format-strings">Format strings<a href="#format-strings" class="hash-link" aria-label="Direct link to Format strings" title="Direct link to Format strings"></a></h2><p>The <code>console.log()</code> takes zero or more arguments of any type.
Template literals and string concatenation are also supported.
Compiler internally constructs a format string (see below).</p><div class="language-ts codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-ts codeBlock_RMoD thin-scrollbar"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#CF222E">let</span><span class="token plain"> x </span><span class="token operator" style="color:#D73A49">=</span><span class="token plain"> </span><span class="token number" style="color:#005CC5">0</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#CF222E">let</span><span class="token plain"> y </span><span class="token operator" style="color:#D73A49">=</span><span class="token plain"> </span><span class="token number" style="color:#005CC5">4</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token builtin">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">log</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#C6105F">"Hello world"</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"></span><span class="token builtin">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">log</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#C6105F">"X is"</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> x</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#C6105F">"and Y is"</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> y</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"></span><span class="token builtin">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">log</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#C6105F">"X="</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> x</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#C6105F">"Y="</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> y</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"></span><span class="token builtin">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">log</span><span class="token punctuation" style="color:#393A34">(</span><span class="token template-string template-punctuation string" style="color:#C6105F">`</span><span class="token template-string string" style="color:#C6105F">X=</span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">${</span><span class="token template-string interpolation">x</span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">}</span><span class="token template-string string" style="color:#C6105F"> Y=</span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">${</span><span class="token template-string interpolation">y</span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">}</span><span class="token template-string template-punctuation string" style="color:#C6105F">`</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"></span><span class="token builtin">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">log</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#C6105F">"X="</span><span class="token plain"> </span><span class="token operator" style="color:#D73A49">+</span><span class="token plain"> x </span><span class="token operator" style="color:#D73A49">+</span><span class="token plain"> </span><span class="token string" style="color:#C6105F">" Y="</span><span class="token plain"> </span><span class="token operator" style="color:#D73A49">+</span><span class="token plain"> y</span><span class="token punctuation" style="color:#393A34">)</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><path fill="currentColor" 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 viewBox="0 0 24 24" class="copyButtonSuccessIcon_L0B6"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>The compiler is smart about adding spaces (the second and third examples will print <code>X is 7 and Y is 12</code>
and <code>X=7 Y=12</code> respectively).</p><p>Concatenation and template literals can be also used to write registers.</p><div class="language-ts codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-ts codeBlock_RMoD thin-scrollbar"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#CF222E">const</span><span class="token plain"> screen </span><span class="token operator" style="color:#D73A49">=</span><span class="token plain"> </span><span class="token keyword" style="color:#CF222E">new</span><span class="token plain"> </span><span class="token class-name" style="color:#116329">ds</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">CharacterScreen</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"></span><span class="token keyword" style="color:#CF222E">let</span><span class="token plain"> x </span><span class="token operator" style="color:#D73A49">=</span><span class="token plain"> </span><span class="token number" style="color:#005CC5">7</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">screen</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">message</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">write</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#C6105F">"X = "</span><span class="token plain"> </span><span class="token operator" style="color:#D73A49">+</span><span class="token plain"> x</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">screen</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">message</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">write</span><span class="token punctuation" style="color:#393A34">(</span><span class="token template-string template-punctuation string" style="color:#C6105F">`</span><span class="token template-string string" style="color:#C6105F">X is </span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">${</span><span class="token template-string interpolation">x</span><span class="token template-string interpolation interpolation-punctuation punctuation" style="color:#393A34">}</span><span class="token template-string template-punctuation string" style="color:#C6105F">`</span><span class="token punctuation" style="color:#393A34">)</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><path fill="currentColor" 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 viewBox="0 0 24 24" class="copyButtonSuccessIcon_L0B6"><path fill="currentColor" 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 also use the <code>ds.format()</code> function directly, either with <code>console.log()</code> or
when setting string registers.
Arguments are <code>{0}</code>, <code>{1}</code>, ..., <code>{9}</code>, <code>{A}</code>, <code>{B}</code>, ..., <code>{F}</code>.
A second digit can be supplied to specify precision (though this doesn't work so well yet):</p><div class="language-ts codeBlockContainer_mQmQ theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_D5yF"><pre tabindex="0" class="prism-code language-ts codeBlock_RMoD thin-scrollbar"><code class="codeBlockLines_AclH"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#CF222E">const</span><span class="token plain"> screen </span><span class="token operator" style="color:#D73A49">=</span><span class="token plain"> </span><span class="token keyword" style="color:#CF222E">new</span><span class="token plain"> </span><span class="token class-name" style="color:#116329">ds</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">CharacterScreen</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"></span><span class="token keyword" style="color:#CF222E">let</span><span class="token plain"> x </span><span class="token operator" style="color:#D73A49">=</span><span class="token plain"> </span><span class="token number" style="color:#005CC5">7</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"> y </span><span class="token operator" style="color:#D73A49">=</span><span class="token plain"> </span><span class="token number" style="color:#005CC5">12</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 builtin">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">log</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">ds</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">format</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#C6105F">"X is {0} and Y is {1}"</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> x</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> y</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"></span><span class="token builtin">console</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">log</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">ds</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">format</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#C6105F">"X = {04}"</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> x</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">screen</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">message</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">write</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">ds</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#8250DF">format</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#C6105F">"X is {0}"</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> x</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><br></span></code></pre><div class="buttonGroup_aaMX"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_z5j7" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_FoOz"><path fill="currentColor" 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 viewBox="0 0 24 24" class="copyButtonSuccessIcon_L0B6"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/devicescript/developer"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Developer</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/devicescript/developer/status-light"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Status Light</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_XG6w thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#console-data" 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