GraphQL Resolver Explained with Examples for API Developers | #graphql

Resolver is a collection of functions that generate response for a GraphQL query. Actually, resolver acts as a GraphQL query handler. Every resolver function in a GraphQL schema accepts four positional arguments.
1. Root - The object that contains the result returned from the resolver on the parent field.
2. args - An object with the arguments passed into the field in the query.
3. context - This is an object shared by all resolvers in a particular query.
4. info - It contains information about the execution state of the query, including the field name, path to the field from the root.

Resolvers can return different types of values like
1. null or undefined - this indicates the object could not be found
2. array - this is only valid if the schema indicates that the result of a field should be a list.
3. promise - resolvers often do asynchronous actions like fetching from a database or backend API, so they can return promises.
4. scalar or object - a resolver can also return other values

#graphql #resolver #graphqlapi

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