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To install

npm install @cityofzion/neon-js


npm install @cityofzion/neon-core

This will give you the release that is compatible for the neo3 mainnet and testnet.

Note For most use-cases, we recommend neon-js. Do not use neon-js and neon-core in the same project. The classes are not cross-package compatible. See


Support policy is to support the maintainence and LTS versions of Node. At the time of writing, this is:

  • Node 12
  • Node 14
  • Node 16


Both neon-core and neon-js are packaged for the web. Use script tags:

<script src=""></script>

The library will be loaded under the variable Neon.