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index.md
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index.md
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---
title: "WebGLRenderingContext: getShaderInfoLog() method"
short-title: getShaderInfoLog()
slug: Web/API/WebGLRenderingContext/getShaderInfoLog
page-type: web-api-instance-method
browser-compat: api.WebGLRenderingContext.getShaderInfoLog
---
{{APIRef("WebGL")}}
The **WebGLRenderingContext.getShaderInfoLog** returns the information log
for the specified {{domxref("WebGLShader")}} object. It contains warnings, debugging and
compile information.
## Syntax
```js-nolint
getShaderInfoLog(shader)
```
### Parameters
- `shader`
- : A {{domxref("WebGLShader")}} to query.
### Return value
A string that contains diagnostic messages, warning messages, and
other information about the last compile operation. When a {{domxref("WebGLShader")}}
object is initially created, its information log will be a string of length 0.
## Examples
### Checking compilation messages
```js
/* load shader source code. */
gl.shaderSource(shader, shaderCode);
/* compile shader source code. */
gl.compileShader(shader);
const message = gl.getShaderInfoLog(shader);
if (message.length > 0) {
/* message may be an error or a warning */
throw message;
}
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{domxref("WebGLRenderingContext.getShaderParameter()")}} – used with
`gl.COMPILE_STATUS` to check for a failed compile.
- {{domxref("WebGLRenderingContext.getError()")}}