| <!DOCTYPE html><html class="default" lang="en" data-base="../"><head><meta charset="utf-8"/><meta http-equiv="x-ua-compatible" content="IE=edge"/><title>WriteOptions | Apache OpenDAL™ - v0.49.2</title><meta name="description" content="Documentation for Apache OpenDAL™"/><meta name="viewport" content="width=device-width, initial-scale=1"/><link rel="stylesheet" href="../assets/style.css"/><link rel="stylesheet" href="../assets/highlight.css"/><script defer src="../assets/main.js"></script><script async src="../assets/icons.js" id="tsd-icons-script"></script><script async src="../assets/search.js" id="tsd-search-script"></script><script async src="../assets/navigation.js" id="tsd-nav-script"></script></head><body><script>document.documentElement.dataset.theme = localStorage.getItem("tsd-theme") || "os";document.body.style.display="none";setTimeout(() => window.app?app.showPage():document.body.style.removeProperty("display"),500)</script><header class="tsd-page-toolbar"><div class="tsd-toolbar-contents container"><a href="../index.html" class="title">Apache OpenDAL™ - v0.49.2</a><div id="tsd-toolbar-links"><a href="https://opendal.apache.org/">Homepage</a><a href="https://github.com/apache/opendal/tree/main/bindings/nodejs">GitHub</a></div><button id="tsd-search-trigger" class="tsd-widget" aria-label="Search"><svg width="16" height="16" viewBox="0 0 16 16" fill="none" aria-hidden="true"><use href="../assets/icons.svg#icon-search"></use></svg></button><dialog id="tsd-search" aria-label="Search"><input role="combobox" id="tsd-search-input" aria-controls="tsd-search-results" aria-autocomplete="list" aria-expanded="true" autocapitalize="off" autocomplete="off" placeholder="Search the docs" maxLength="100"/><ul role="listbox" id="tsd-search-results"></ul><div id="tsd-search-status" aria-live="polite" aria-atomic="true"><div>Preparing search index...</div></div></dialog><a href="#" class="tsd-widget menu" id="tsd-toolbar-menu-trigger" data-toggle="menu" aria-label="Menu"><svg width="16" height="16" viewBox="0 0 16 16" fill="none" aria-hidden="true"><use href="../assets/icons.svg#icon-menu"></use></svg></a></div></header><div class="container container-main"><div class="col-content"><div class="tsd-page-title"><ul class="tsd-breadcrumb" aria-label="Breadcrumb"><li><a href="../modules/index.html">index</a></li><li><a href="" aria-current="page">WriteOptions</a></li></ul><h1>Interface WriteOptions</h1></div><div class="tsd-signature"><span class="tsd-signature-keyword">interface</span> <span class="tsd-kind-interface">WriteOptions</span> <span class="tsd-signature-symbol">{</span><br/> <a class="tsd-kind-property" href="#append">append</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol">;</span><br/> <a class="tsd-kind-property" href="#cachecontrol">cacheControl</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br/> <a class="tsd-kind-property" href="#chunk">chunk</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">bigint</span><span class="tsd-signature-symbol">;</span><br/> <a class="tsd-kind-property" href="#concurrent">concurrent</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">;</span><br/> <a class="tsd-kind-property" href="#contentdisposition">contentDisposition</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br/> <a class="tsd-kind-property" href="#contentencoding">contentEncoding</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br/> <a class="tsd-kind-property" href="#contenttype">contentType</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br/> <a class="tsd-kind-property" href="#ifmatch">ifMatch</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br/> <a class="tsd-kind-property" href="#ifnonematch">ifNoneMatch</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">;</span><br/> <a class="tsd-kind-property" href="#ifnotexists">ifNotExists</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol">;</span><br/> <a class="tsd-kind-property" href="#usermetadata">userMetadata</a><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">Record</span><span class="tsd-signature-symbol"><</span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">,</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">></span><span class="tsd-signature-symbol">;</span><br/><span class="tsd-signature-symbol">}</span></div><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/apache/opendal/blob/31107b6eb1e3b8a4152d286673c1de756fa5ca73/bindings/nodejs/generated.d.ts#L1303">generated.d.ts:1303</a></li></ul></aside><section class="tsd-panel-group tsd-index-group"><section class="tsd-panel tsd-index-panel"><details class="tsd-index-content tsd-accordion" open><summary class="tsd-accordion-summary tsd-index-summary"><svg width="20" height="20" viewBox="0 0 24 24" fill="none" aria-hidden="true"><use href="../assets/icons.svg#icon-chevronDown"></use></svg><h5 class="tsd-index-heading uppercase">Index</h5></summary><div class="tsd-accordion-details"><section class="tsd-index-section"><h3 class="tsd-index-heading">Properties</h3><div class="tsd-index-list"><a href="#append" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../assets/icons.svg#icon-1024"></use></svg><span>append?</span></a> |
| <a href="#cachecontrol" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../assets/icons.svg#icon-1024"></use></svg><span>cache<wbr/>Control?</span></a> |
| <a href="#chunk" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../assets/icons.svg#icon-1024"></use></svg><span>chunk?</span></a> |
| <a href="#concurrent" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../assets/icons.svg#icon-1024"></use></svg><span>concurrent?</span></a> |
| <a href="#contentdisposition" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../assets/icons.svg#icon-1024"></use></svg><span>content<wbr/>Disposition?</span></a> |
| <a href="#contentencoding" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../assets/icons.svg#icon-1024"></use></svg><span>content<wbr/>Encoding?</span></a> |
| <a href="#contenttype" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../assets/icons.svg#icon-1024"></use></svg><span>content<wbr/>Type?</span></a> |
| <a href="#ifmatch" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../assets/icons.svg#icon-1024"></use></svg><span>if<wbr/>Match?</span></a> |
| <a href="#ifnonematch" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../assets/icons.svg#icon-1024"></use></svg><span>if<wbr/>None<wbr/>Match?</span></a> |
| <a href="#ifnotexists" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../assets/icons.svg#icon-1024"></use></svg><span>if<wbr/>Not<wbr/>Exists?</span></a> |
| <a href="#usermetadata" class="tsd-index-link"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Property"><use href="../assets/icons.svg#icon-1024"></use></svg><span>user<wbr/>Metadata?</span></a> |
| </div></section></div></details></section></section><details class="tsd-panel-group tsd-member-group tsd-accordion" open><summary class="tsd-accordion-summary" data-key="section-Properties"><svg width="20" height="20" viewBox="0 0 24 24" fill="none" aria-hidden="true"><use href="../assets/icons.svg#icon-chevronDown"></use></svg><h2>Properties</h2></summary><section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="append"><code class="tsd-tag">Optional</code><span>append</span><a href="#append" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><div class="tsd-signature"><span class="tsd-kind-property">append</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span></div><div class="tsd-comment tsd-typography"><p>Append bytes into a path.</p> |
| <h3 id="notes" class="tsd-anchor-link">Notes<a href="#notes" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul> |
| <li>It always appends content to the end of the file.</li> |
| <li>It will create file if the path does not exist.</li> |
| </ul> |
| </div><div class="tsd-comment tsd-typography"></div><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/apache/opendal/blob/31107b6eb1e3b8a4152d286673c1de756fa5ca73/bindings/nodejs/generated.d.ts#L1312">generated.d.ts:1312</a></li></ul></aside></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="cachecontrol"><code class="tsd-tag">Optional</code><span>cache<wbr/>Control</span><a href="#cachecontrol" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><div class="tsd-signature"><span class="tsd-kind-property">cacheControl</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Set the <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control">Cache-Control</a> of op.</p> |
| </div><div class="tsd-comment tsd-typography"></div><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/apache/opendal/blob/31107b6eb1e3b8a4152d286673c1de756fa5ca73/bindings/nodejs/generated.d.ts#L1330">generated.d.ts:1330</a></li></ul></aside></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="chunk"><code class="tsd-tag">Optional</code><span>chunk</span><a href="#chunk" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><div class="tsd-signature"><span class="tsd-kind-property">chunk</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">bigint</span></div><div class="tsd-comment tsd-typography"><p>Set the chunk of op.</p> |
| <p>If chunk is set, the data will be chunked by the underlying writer.</p> |
| <h2 id="note" class="tsd-anchor-link">NOTE<a href="#note" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><p>A service could have their own minimum chunk size while perform write |
| operations like multipart uploads. So the chunk size may be larger than |
| the given buffer size.</p> |
| </div><div class="tsd-comment tsd-typography"></div><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/apache/opendal/blob/31107b6eb1e3b8a4152d286673c1de756fa5ca73/bindings/nodejs/generated.d.ts#L1324">generated.d.ts:1324</a></li></ul></aside></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="concurrent"><code class="tsd-tag">Optional</code><span>concurrent</span><a href="#concurrent" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><div class="tsd-signature"><span class="tsd-kind-property">concurrent</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">number</span></div><div class="tsd-comment tsd-typography"><p>Sets concurrent of op.</p> |
| <ul> |
| <li>By default, OpenDAL writes files sequentially</li> |
| <li>When concurrent is set: |
| <ul> |
| <li>Multiple write operations can execute in parallel</li> |
| <li>Write operations return immediately without waiting if tasks space are available</li> |
| <li>Close operation ensures all writes complete in order</li> |
| <li>Memory usage increases with concurrency level</li> |
| </ul> |
| </li> |
| </ul> |
| </div><div class="tsd-comment tsd-typography"></div><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/apache/opendal/blob/31107b6eb1e3b8a4152d286673c1de756fa5ca73/bindings/nodejs/generated.d.ts#L1378">generated.d.ts:1378</a></li></ul></aside></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="contentdisposition"><code class="tsd-tag">Optional</code><span>content<wbr/>Disposition</span><a href="#contentdisposition" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><div class="tsd-signature"><span class="tsd-kind-property">contentDisposition</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Set the <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Disposition">Content-Disposition</a> of op.</p> |
| </div><div class="tsd-comment tsd-typography"></div><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/apache/opendal/blob/31107b6eb1e3b8a4152d286673c1de756fa5ca73/bindings/nodejs/generated.d.ts#L1328">generated.d.ts:1328</a></li></ul></aside></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="contentencoding"><code class="tsd-tag">Optional</code><span>content<wbr/>Encoding</span><a href="#contentencoding" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><div class="tsd-signature"><span class="tsd-kind-property">contentEncoding</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Set the [Content-Encoding] <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Encoding">https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Encoding</a> of op.</p> |
| </div><div class="tsd-comment tsd-typography"></div><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/apache/opendal/blob/31107b6eb1e3b8a4152d286673c1de756fa5ca73/bindings/nodejs/generated.d.ts#L1332">generated.d.ts:1332</a></li></ul></aside></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="contenttype"><code class="tsd-tag">Optional</code><span>content<wbr/>Type</span><a href="#contenttype" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><div class="tsd-signature"><span class="tsd-kind-property">contentType</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Set the <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Type">Content-Type</a> of op.</p> |
| </div><div class="tsd-comment tsd-typography"></div><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/apache/opendal/blob/31107b6eb1e3b8a4152d286673c1de756fa5ca73/bindings/nodejs/generated.d.ts#L1326">generated.d.ts:1326</a></li></ul></aside></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="ifmatch"><code class="tsd-tag">Optional</code><span>if<wbr/>Match</span><a href="#ifmatch" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><div class="tsd-signature"><span class="tsd-kind-property">ifMatch</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Sets if-match condition of op.</p> |
| <p>This operation provides conditional write functionality based on ETag matching, |
| helping prevent unintended overwrites in concurrent scenarios.</p> |
| </div><div class="tsd-comment tsd-typography"></div><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/apache/opendal/blob/31107b6eb1e3b8a4152d286673c1de756fa5ca73/bindings/nodejs/generated.d.ts#L1353">generated.d.ts:1353</a></li></ul></aside></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="ifnonematch"><code class="tsd-tag">Optional</code><span>if<wbr/>None<wbr/>Match</span><a href="#ifnonematch" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><div class="tsd-signature"><span class="tsd-kind-property">ifNoneMatch</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">string</span></div><div class="tsd-comment tsd-typography"><p>Sets if-none-match condition of op.</p> |
| <p>This operation provides conditional write functionality based on ETag non-matching, |
| useful for preventing overwriting existing resources or ensuring unique writes.</p> |
| </div><div class="tsd-comment tsd-typography"></div><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/apache/opendal/blob/31107b6eb1e3b8a4152d286673c1de756fa5ca73/bindings/nodejs/generated.d.ts#L1360">generated.d.ts:1360</a></li></ul></aside></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="ifnotexists"><code class="tsd-tag">Optional</code><span>if<wbr/>Not<wbr/>Exists</span><a href="#ifnotexists" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><div class="tsd-signature"><span class="tsd-kind-property">ifNotExists</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">boolean</span></div><div class="tsd-comment tsd-typography"><p>Sets if_not_exists condition of op.</p> |
| <p>This operation provides a way to ensure write operations only create new resources |
| without overwriting existing ones, useful for implementing "create if not exists" logic.</p> |
| </div><div class="tsd-comment tsd-typography"></div><aside class="tsd-sources"><ul><li>Defined in <a href="https://github.com/apache/opendal/blob/31107b6eb1e3b8a4152d286673c1de756fa5ca73/bindings/nodejs/generated.d.ts#L1367">generated.d.ts:1367</a></li></ul></aside></section><section class="tsd-panel tsd-member"><h3 class="tsd-anchor-link" id="usermetadata"><code class="tsd-tag">Optional</code><span>user<wbr/>Metadata</span><a href="#usermetadata" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><div class="tsd-signature"><span class="tsd-kind-property">userMetadata</span><span class="tsd-signature-symbol">?:</span> <span class="tsd-signature-type">Record</span><span class="tsd-signature-symbol"><</span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">,</span> <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">></span></div><div class="tsd-comment tsd-typography"><p>Sets user metadata of op.</p> |
| <p>If chunk is set, the user metadata will be attached to the object during write.</p> |
| <h2 id="note-1" class="tsd-anchor-link">NOTE<a href="#note-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><ul> |
| <li>Services may have limitations for user metadata, for example: |
| <ul> |
| <li>Key length is typically limited (e.g., 1024 bytes)</li> |
| <li>Value length is typically limited (e.g., 4096 bytes)</li> |
| <li>Total metadata size might be limited</li> |
| <li>Some characters might be forbidden in keys</li> |
| </ul> |
| </li> |
| </ul> |
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