The JWST instrument suite
JWST will carry four science instruments:
Near-Infrared Spectrograph, provided by ESA with some elements provided by NASA's Goddard Space Flight Center. A wide field (3.4' x 3.6') multi-object near- infrared spectrometer covering wavelengths 0.6µm - 5 µm at spectral resolutions of R~100, R~1000 and R~2700.
Mid-Infrared Instrument, provided by a partnership composed of ESA, a consortium of nationally funded European institutes, NASA's Jet Propulsion Laboratory, and NASA's Goddard Space Flight Center (GSFC) A combined mid-infrared camera (1.3' x 1.7') and spectrograph (R~100 and R~3000) covering wavelengths from 5 µm to 28.3 µm. It also includes a coronagraph.
Fine Guidance System/Near-InfraRed Imager and Slitless Spectrograph, provided by the Canadian Space Agency. NIRISS is a wide-field (2.2' x 2.2') imager capable of 1.0 µm - 2.5 µm slitless spectroscopy. It also includes a spectroscopic observing mode optimized for exoplanet spectroscopy.
The four instruments are housed within the JWST payload module called the Integrated Science Instrument Module (ISIM).