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