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index.md
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---
title: "WebGL2RenderingContext: getUniformBlockIndex() method"
short-title: getUniformBlockIndex()
slug: Web/API/WebGL2RenderingContext/getUniformBlockIndex
page-type: web-api-instance-method
browser-compat: api.WebGL2RenderingContext.getUniformBlockIndex
---
{{APIRef("WebGL")}}
The **`WebGL2RenderingContext.getUniformBlockIndex()`** method
of the [WebGL 2 API](/en-US/docs/Web/API/WebGL_API) retrieves the index of
a uniform block within a {{domxref("WebGLProgram")}}.
## Syntax
```js-nolint
getUniformBlockIndex(program, uniformBlockName)
```
### Parameters
- `program`
- : A {{domxref("WebGLProgram")}} containing the uniform block.
- `uniformName`
- : A string specifying the name of the uniform block to whose index
to retrieve.
### Return value
A {{domxref("WebGL_API/Types", "GLuint")}} indicating the uniform block index.
## Examples
```js
// Assuming a shader with the following declaration:
// uniform UBOData {
// mat4 foo;
// } instanceName;
// use the block name, not the instance name:
const blockIndex = gl.getUniformBlockIndex(program, "UBOData");
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{domxref("WebGL2RenderingContext.getUniformIndices()")}}