During the build lifecycle, which we cover in detail in the final section of this app, Gatsby generates a GraphQL schema that enables Gatsby developers to query data from a variety of external or internal sources. This step takes place automatically during the Gatsby bootstrap.
However, there are often scenarios where some schema customization is required in order to adjust the shape of data returned by queries, or to enrich the query layer with additional functionality. In this section, we walk through Gatsby’s Schema Customization API, which allows us to customize the schema so it adheres to our needs.
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