library.json is a manifest file of a library package. It allows developers to keep a project in its own structure and define:

  • compatible frameworks and platforms

  • external dependencies

  • advanced build settings.

Information in library.json should be represented in JSON-style via associative array (name/value pairs). The order doesn’t matter. The allowable fields (names from pairs) are described below.

You can validate library.json manifest file using the pio pkg pack command.