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 errors

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

/* compile shader source code. */

var error = gl.getShaderInfoLog(shader);

if(error.length > 0) {
  throw error;


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

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Basic support 9 12 4.0 (2.0) 11 12 5.1
Feature Android Chrome for Android Edge Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile
Basic support ? 25 (Yes) 4.0 (2.0) 1.0 ? 12 8.0

See also

Document Tags and Contributors

 Contributors to this page: fscholz, CzarSnow
 Last updated by: fscholz,