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graphql-tools

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graphql-tools

Useful tools to create and manipulate GraphQL schemas.

  • 9.0.2
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  • npm
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575K
decreased by-17.9%
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What is graphql-tools?

The graphql-tools package is a set of utilities that help in the development of GraphQL schemas and resolvers in JavaScript. It provides tools for schema stitching, schema delegation, and schema transformation, among other functionalities.

What are graphql-tools's main functionalities?

Schema Stitching

Schema stitching allows you to combine multiple GraphQL schemas into a single schema. This is useful for modularizing your GraphQL API and for integrating multiple services.

const { makeExecutableSchema, mergeSchemas } = require('graphql-tools');

const schemaA = makeExecutableSchema({ typeDefs: `type Query { hello: String }`, resolvers: { Query: { hello: () => 'Hello from schema A' } } });
const schemaB = makeExecutableSchema({ typeDefs: `type Query { world: String }`, resolvers: { Query: { world: () => 'World from schema B' } } });

const mergedSchema = mergeSchemas({ schemas: [schemaA, schemaB] });

Schema Delegation

Schema delegation allows you to forward a query from one schema to another. This is useful for creating a unified API that delegates parts of the query to different underlying services.

const { delegateToSchema } = require('graphql-tools');

const schemaA = makeExecutableSchema({ typeDefs: `type Query { hello: String }`, resolvers: { Query: { hello: () => 'Hello from schema A' } } });

const resolvers = {
  Query: {
    helloFromA: (parent, args, context, info) => delegateToSchema({ schema: schemaA, operation: 'query', fieldName: 'hello', context, info })
  }
};

Schema Transformation

Schema transformation allows you to modify an existing schema. This can include renaming types, adding or removing fields, and other modifications. This is useful for adapting third-party schemas to fit your needs.

const { transformSchema, RenameTypes } = require('graphql-tools');

const schema = makeExecutableSchema({ typeDefs: `type Query { hello: String }`, resolvers: { Query: { hello: () => 'Hello' } } });

const transformedSchema = transformSchema(schema, [new RenameTypes(name => `New_${name}`)]);

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Package last updated on 15 Oct 2024

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