diff --git a/.github/workflows/jsroot-ci.yml b/.github/workflows/jsroot-ci.yml
index 57081f38d..4b6a52cf4 100644
--- a/.github/workflows/jsroot-ci.yml
+++ b/.github/workflows/jsroot-ci.yml
@@ -67,6 +67,7 @@ jobs:
           node demo/node/file_proxy.js buffer ./hsimple.root
           node demo/node/rntuple_buffer_test.js
           node demo/node/rntuple_test.js demo/node/rntuple_test.root
+          node demo/node/rntuple_test32.js demo/node/rntuple_test32.root demo/node/rntuple_test32.json
 
   tests_ubuntu:
     runs-on: ubuntu-latest
@@ -184,6 +185,8 @@ jobs:
           node demo/node/file_proxy.js buffer ./hsimple.root
           node demo/node/rntuple_buffer_test.js
           node demo/node/rntuple_test.js demo/node/rntuple_test.root
+          node demo/node/rntuple_test32.js demo/node/rntuple_test32.root demo/node/rntuple_test32.json
+
 
   build-windows:
     runs-on: windows-latest
@@ -235,3 +238,5 @@ jobs:
           node demo/node/file_proxy.js buffer ./hsimple.root
           node demo/node/rntuple_buffer_test.js
           node demo/node/rntuple_test.js demo/node/rntuple_test.root
+          node demo/node/rntuple_test32.js demo/node/rntuple_test32.root demo/node/rntuple_test32.json
+
diff --git a/demo/node/rntuple_test32.js b/demo/node/rntuple_test32.js
new file mode 100644
index 000000000..8fecacdb9
--- /dev/null
+++ b/demo/node/rntuple_test32.js
@@ -0,0 +1,80 @@
+import { openFile, TSelector } from 'jsroot';
+import { rntupleProcess } from 'jsroot/rntuple';
+import { readFileSync } from 'fs';
+
+
+// convert float to hex representation based on IEEE-754 and C99 standard
+function floatToHex(num)
+{
+   if (num === 0)
+      return (Object.is(num, -0) ? '-' : '') + '0x0p+0';
+
+   const buf = new ArrayBuffer(8), // 8 Byte == 64 Bit
+         view = new DataView(buf);
+   view.setFloat64(0, num, false);
+
+   const bits = view.getBigUint64(0, false),      // bitwise operations only work with integer
+         sign = Number(bits >> 63n),              // sign on first bit
+         rawExp = Number((bits >> 52n) & 0x7ffn), // exponent on next 11 bits
+         fraction = bits & 0xfffffffffffffn;      // fraction on next 52 bits
+
+   let exp, leading, mantBits;
+   if (rawExp === 0) {
+      // check for really small numbers
+      if (fraction === 0n)
+         return (sign ? '-' : '') + '0x0p+0';
+      exp = -1022;
+      leading = '0';
+      mantBits = fraction;
+   } else {
+      exp = rawExp - 1023;
+      leading = '1';
+      mantBits = fraction;
+   }
+
+   const hex = mantBits.toString(16).padStart(13, '0').replace(/0+$/, ''),
+         frac = hex ? '.' + hex : '',
+         expStr = (exp >= 0 ? '+' : '-') + Math.abs(exp);
+
+   return (sign ? '-' : '') + '0x' + leading + frac + 'p' + expStr;
+}
+
+async function read_file(input_root = 'rntuple_test32.root', input_ref = 'rntuple_test32.json')
+{
+   const file = await openFile(input_root), rntuple = await file.readObject('ntpl'),
+         original = JSON.parse(readFileSync(input_ref)),
+         selector = new TSelector(),
+         fields = [
+            'FloatReal32Quant1',
+            'FloatReal32Quant8',
+            'FloatReal32Quant32',
+            'DoubleReal32Quant1',
+            'DoubleReal32Quant20',
+            'DoubleReal32Quant32',
+         ];
+
+   for (const f of fields)
+      selector.addBranch(f);
+
+   selector.Process = function(entryIndex) {
+      for (const field of fields) {
+         try {
+            const value = floatToHex(this.tgtobj[field]), expected = original[entryIndex][field];
+
+            if (value !== expected) {
+               console.error(`FAILURE: ${field} at entry ${entryIndex} expected ${expected},`+
+                             `got ${value}`);
+            } else
+               console.log(`OK: ${field} at entry ${entryIndex} = ${value}`);
+         } catch (err) {
+            console.error(`ERROR: Failed to read ${field} at entry ${entryIndex}: ${err.message}`);
+         }
+      }
+   };
+
+   await rntupleProcess(rntuple, selector);
+}
+
+const [input_root, input_ref] = process.argv.slice(2);
+
+read_file(input_root, input_ref);
diff --git a/demo/node/rntuple_test32.json b/demo/node/rntuple_test32.json
new file mode 100644
index 000000000..bd8ba384c
--- /dev/null
+++ b/demo/node/rntuple_test32.json
@@ -0,0 +1,42 @@
+[
+  {
+    "FloatReal32Quant1": "-0x1p+0",
+    "FloatReal32Quant8": "-0x1.fdfdfdfdfdfep-2",
+    "FloatReal32Quant32": "0x1.0000000a1516p-2",
+    "DoubleReal32Quant1": "0x1p+0",
+    "DoubleReal32Quant20": "0x1p+0",
+    "DoubleReal32Quant32": "0x1.000000118p+1"
+  },
+  {
+    "FloatReal32Quant1": "0x1p+0",
+    "FloatReal32Quant8": "0x1.0101010101p-8",
+    "FloatReal32Quant32": "0x1.921fbp-31",
+    "DoubleReal32Quant1": "0x1p+0",
+    "DoubleReal32Quant20": "0x1.00001p-20",
+    "DoubleReal32Quant32": "0x0p+0"
+  },
+  {
+    "FloatReal32Quant1": "0x1p+0",
+    "FloatReal32Quant8": "0x1.0101010101p-8",
+    "FloatReal32Quant32": "0x1.921fbp-31",
+    "DoubleReal32Quant1": "0x1p+0",
+    "DoubleReal32Quant20": "0x1.00001p-20",
+    "DoubleReal32Quant32": "-0x1.2bfffffe0cp+5"
+  },
+  {
+    "FloatReal32Quant1": "-0x1p+0",
+    "FloatReal32Quant8": "-0x1p+0",
+    "FloatReal32Quant32": "-0x1.921fb6p+1",
+    "DoubleReal32Quant1": "-0x1p+0",
+    "DoubleReal32Quant20": "-0x1p+0",
+    "DoubleReal32Quant32": "-0x1.9p+6"
+  },
+  {
+    "FloatReal32Quant1": "0x1p+0",
+    "FloatReal32Quant8": "0x1p+0",
+    "FloatReal32Quant32": "0x1.921fb6p+1",
+    "DoubleReal32Quant1": "0x1p+0",
+    "DoubleReal32Quant20": "0x1p+0",
+    "DoubleReal32Quant32": "0x1.9p+4"
+  }
+]
diff --git a/demo/node/rntuple_test32.root b/demo/node/rntuple_test32.root
new file mode 100644
index 000000000..c6db2b932
Binary files /dev/null and b/demo/node/rntuple_test32.root differ