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---
title: DataView.prototype.getFloat32()
short-title: getFloat32()
slug: Web/JavaScript/Reference/Global_Objects/DataView/getFloat32
page-type: javascript-instance-method
browser-compat: javascript.builtins.DataView.getFloat32
sidebar: jsref
---
The **`getFloat32()`** method of {{jsxref("DataView")}} instances reads 4 bytes starting at the specified byte offset of this `DataView` and interprets them as a 32-bit floating point number. There is no alignment constraint; multi-byte values may be fetched from any offset within bounds.
{{InteractiveExample("JavaScript Demo: DataView.prototype.getFloat32()")}}
```js interactive-example
// Create an ArrayBuffer with a size in bytes
const buffer = new ArrayBuffer(16);
const view = new DataView(buffer);
view.setFloat32(1, Math.PI);
console.log(view.getFloat32(1));
// Expected output: 3.1415927410125732
```
## Syntax
```js-nolint
getFloat32(byteOffset)
getFloat32(byteOffset, littleEndian)
```
### Parameters
- `byteOffset`
- : The offset, in bytes, from the start of the view to read the data from.
- `littleEndian` {{optional_inline}}
- : Indicates whether the data is stored in [little- or big-endian](/en-US/docs/Glossary/Endianness) format. If `false` or `undefined`, a big-endian value is read.
### Return value
A floating point number from `-3.4e38` to `3.4e38`.
### Exceptions
- {{jsxref("RangeError")}}
- : Thrown if the `byteOffset` is set such that it would read beyond the end of the view.
## Examples
### Using getFloat32()
```js
const { buffer } = new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
const dataview = new DataView(buffer);
console.log(dataview.getFloat32(1)); // 2.387939260590663e-38
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [JavaScript typed arrays](/en-US/docs/Web/JavaScript/Guide/Typed_arrays) guide
- {{jsxref("DataView")}}
- {{jsxref("ArrayBuffer")}}
- {{jsxref("Float32Array")}}
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