The Chemical JSON schema has been in development and use since 2011, focusing on the needs of the Avogadro chemical editor\cite{Hanwell2012} and the associated Open Chemistry open source projects. It has as such been developed to enable the visualization and analysis of chemical systems, supporting elements such as the basis set, molecular orbitals and other electronic structure calculation outputs of the system to offer a flexible format. This has been extended\cite{Hanwell2017} to support multiple steps in a reaction coordinate calculation for example (one basis set, multiple 3D geometries and molecular orbital matrices). There is also support for vibrational modes, and 3D cubes representing calculated molecular orbitals. An extended example for water, available in the Chemical JSON repository, shows a basis set, molecular orbitals and related data from a Psi4\cite{Parrish_2017} energy calculation.