`app.json` is a manifest format for describing web apps. It declares environment variables, addons, and other information required to run an app on Heroku. This document describes the schema in detail. ## Example app.json ```json {{{exampleJSON}}} ``` ## Schema Reference {{#propertiesArray}} ### {{name}} *({{type}}, {{requiredOrOptional}})* {{description}} ```json {{{exampleJSON}}} ``` {{/propertiesArray}}