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This paper describes the near-infrared detector system noise generator (NG)that we wrote for the James Webb Space Telescope (JWST) Near InfraredSpectrograph (NIRSpec). NG simulates many important noise components including;(1) white "read noise," (2) residual bias drifts, (3) pink $1/f$ noise, (4)alternating column noise, and (5) picture frame noise. By adjusting the inputparameters, NG can simulate noise for Teledyne's H1RG, H2RG, and H4RG detectorswith and without Teledyne's SIDECAR ASIC IR array controller. NG can be used asa starting point for simulating astronomical scenes by adding dark current,scattered light, and astronomical sources into the results from NG. NG iswritten in Python-3.4. The source code is freely available for download fromhttp://jwst.nasa.gov/publications.html.

Teledyne H1RG, H2RG, and H4RG Noise Generator