GraphQL schemas, types, queries, mutations, subscriptions, resolvers, N+1 problem and comparison with REST.
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- What is GraphQL?
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A query language and runtime for APIs that allows clients to request exactly the data they need- What is a GraphQL schema?
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A type system that defines all possible data types, queries, mutations, and subscriptions a GraphQL API can handle- What is SDL in GraphQL?
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Schema Definition Language, a human-readable syntax for defining a GraphQL schema- What are the built-in scalar types in GraphQL?
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String, Int, Float, Boolean, and ID- What is an Object type in GraphQL?
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A type that represents a complex object with named fields, each of which has its own type- What is an Interface in GraphQL?
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A template that defines a set of fields that multiple object types can implement- What is a Union type in GraphQL?
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A type that represents an object that could be one of several different object types- What is an Enum type in GraphQL?
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A scalar type that represents a fixed set of allowed string values- What is an Input type in GraphQL?
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A type used as an argument to queries or mutations to pass structured input data- What does the exclamation mark mean in a GraphQL type definition?
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The field is non-nullable (required), meaning it will never return null- What does [Type] represent in GraphQL?
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A list of that type, where the bracketed type can appear zero or more times in the result- What is a GraphQL query?
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A request for data from a GraphQL server that specifies exactly which fields to retrieve- What is the Query root type in GraphQL?
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The entry point that defines all top-level queries available in a GraphQL API- What is a resolver in GraphQL?
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A function that returns the data for a field, either from a database, cache, or another source- What are the standard parameters of a resolver function?
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The parent object, field arguments, context object, and info about the query
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