diff --git a/src/components/download/downloadButtons.js b/src/components/download/downloadButtons.js
index b077016cc..69fa93309 100644
--- a/src/components/download/downloadButtons.js
+++ b/src/components/download/downloadButtons.js
@@ -10,6 +10,7 @@ import { getNumSelectedTips } from "../../util/treeVisibilityHelpers";
 const RectangularTreeIcon = withTheme(icons.RectangularTree);
 const PanelsGridIcon = withTheme(icons.PanelsGrid);
 const MetaIcon = withTheme(icons.Meta);
+const DatasetIcon = withTheme(icons.Dataset);
 const iconWidth = 25;
 
 /**
@@ -47,6 +48,14 @@ export const DownloadButtons = ({dispatch, t, tree, entropy, metadata, colorBy,
         <p/>
         {partialData ? `Currently ${selectedTipsCount}/${totalTipCount} tips are displayed and will be downloaded.` : `Currently the entire dataset (${totalTipCount} tips) will be downloaded.`}
       </div>
+      {!gisaidProvenance && (
+        <Button
+          name="Auspice (Nextstrain) JSON"
+          description={`The main Auspice dataset JSON(s) for the current view`}
+          icon={<DatasetIcon width={iconWidth} selected />}
+          onClick={() => helpers.auspiceJSON(dispatch)}
+        />
+      )}
       <Button
         name={`${temporal ? 'TimeTree' : 'Tree'} (Newick)`}
         description={`Phylogenetic tree in Newick format with branch lengths in units of ${temporal?'years':'divergence'}.`}
diff --git a/src/components/download/helperFunctions.js b/src/components/download/helperFunctions.js
index 23fcc1457..aa74bc67f 100644
--- a/src/components/download/helperFunctions.js
+++ b/src/components/download/helperFunctions.js
@@ -1,6 +1,6 @@
 /* eslint no-restricted-syntax: 0 */
 import { unparse } from "papaparse";
-import { infoNotification, warningNotification } from "../../actions/notifications";
+import { errorNotification, infoNotification, warningNotification } from "../../actions/notifications";
 import { spaceBetweenTrees } from "../tree/tree";
 import { getTraitFromNode, getDivFromNode, getFullAuthorInfoFromNode, getVaccineFromNode, getAccessionFromNode } from "../../util/treeMiscHelpers";
 import { numericToCalendar } from "../../util/dateHelpers";
@@ -8,6 +8,7 @@ import { NODE_VISIBLE, nucleotide_gene } from "../../util/globals";
 import { datasetSummary } from "../info/datasetSummary";
 import { isColorByGenotype } from "../../util/getGenotype";
 import { EmptyNewickTreeCreated } from "../../util/exceptions";
+import { getDatasetNamesFromUrl, Dataset } from "../../actions/loadData";
 
 export const isPaperURLValid = (d) => {
   return (
@@ -56,7 +57,8 @@ const MIME = {
   text: "text/plain;charset=utf-8;",
   csv: 'text/csv;charset=utf-8;',
   tsv: `text/tab-separated-values;charset=utf-8;`,
-  svg: "image/svg+xml;charset=utf-8"
+  svg: "image/svg+xml;charset=utf-8",
+  json: "application/json",
 };
 
 const treeToNexus = (tree, colorings, colorBy, temporal) => {
@@ -616,3 +618,33 @@ export const entropyTSV = (dispatch, filePrefix, entropy) => {
   write(filename, MIME.tsv, createTsvString(objectsToWrite, headerFields));
   dispatch(infoNotification({message: `Diversity data exported to ${filename}`}));
 };
+
+
+/**
+ * Write out Auspice JSON(s) for the current view. We do this by re-fetching the original
+ * JSON because we don't keep a copy of the unprocessed data around.
+ * 
+ * Sidecar files are not fetched, but we can also download them if desired.
+ * 
+ * Note that we are not viewing a narrative, as the download button functionality is disabled
+ * for narratives.
+ */
+export const auspiceJSON = (dispatch) => {
+  const filenames = [];
+  for (const datasetName of getDatasetNamesFromUrl(window.location.pathname)) {
+    if (!datasetName) continue; // e.g. no 2nd tree
+    const filename = datasetName.replace('/', '_') + '.json';
+    filenames.push(filename);
+    const dataset = new Dataset(datasetName);
+    dataset.fetchMain(); // initialises dataset.main (a promise)
+    dataset.main.then((jsonContents) => {
+      write(filename, MIME.json, JSON.stringify(jsonContents));
+    }).catch((err) => {
+      // I think this error path should be rarely (never!) encountered, because the fetch call has
+      // worked to load the dataset in the first place...
+      console.error(`Error fetching JSON for ${datasetName}: ${err}`);
+      dispatch(errorNotification({message: `Error preparing ${filename} JSON for download (see console for more info)`}));
+    });
+  }
+  dispatch(infoNotification({message: `Preparing Auspice JSON(s) for download: ${filenames.join(', ')}`}));
+};
\ No newline at end of file
diff --git a/src/components/framework/svg-icons.js b/src/components/framework/svg-icons.js
index 90c552080..4a5815b3e 100644
--- a/src/components/framework/svg-icons.js
+++ b/src/components/framework/svg-icons.js
@@ -150,3 +150,20 @@ export const PanelsFull = ({theme, selected, width}) => {
     </svg>
   );
 };
+
+
+export const Dataset = ({theme, selected, width}) => {
+  const stroke = selected ? theme.selectedColor : theme.unselectedColor;
+  return (
+    <svg width={width} height={width + 5}>
+      <g transform="translate(0,7)">
+        <svg width={width} height={width} viewBox="0 0 30 30 ">
+          <g id="Group" stroke="none" strokeWidth="3" fill="none" fillRule="evenodd">
+            <path stroke={stroke} d={`M 11 3 L 1 15 L 11 27`}/>
+            <path stroke={stroke} d={`M 19 3 L 29 15 L 19 27`}/>
+          </g>
+        </svg>
+      </g>
+    </svg>
+  );
+};