The WebGLRenderingContext.getShaderInfoLog returns the information log for the specified WebGLShader object. It contains warnings, debugging and compile information.




A WebGLShader to query.

Return value

A DOMString that contains diagnostic messages, warning messages, and other information about the last compile operation. When a WebGLShader object is initially created, its information log will be a string of length 0.


Checking compilation messages

/* load shader source code. */
gl.shaderSource(shader, shaderCode);

/* compile shader source code. */

var message = gl.getShaderInfoLog(shader);

if (message.length > 0) {
  /* message may be an error or a warning */
  throw message;


Specification Status Comment
WebGL 1.0
The definition of 'getShaderInfoLog' in that specification.
Recommendation Initial definition.
OpenGL ES 2.0
The definition of 'glGetShaderInfoLog' in that specification.
Standard Man page of the OpenGL API.

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
getShaderInfoLogChrome Full support 9Edge Full support 12Firefox Full support 4IE Full support 11Opera Full support 12Safari Full support 5.1WebView Android Full support YesChrome Android Full support 25Edge Mobile Full support YesFirefox Android Full support YesOpera Android Full support 12Safari iOS Full support 8.1Samsung Internet Android Full support Yes


Full support  
Full support

See also

Document Tags and Contributors

Contributors to this page: mdnwebdocs-bot, markusfisch, fscholz, nmve, teoli, CzarSnow
Last updated by: mdnwebdocs-bot,