install

npm i apollo-resolver-middleware

usage

add middlewares in schema.js where resolvers defined

const applyResolverMid = require('apollo-resolver-middleware')

const typeDefs = gql`
  type Query {
    getData: Response
  }
  type Response {
    success: Boolean
    message: String
  }
`

const resolvers = {
  Query: {
    getData: (parent, args, context, info) => {
      return {
        success: true,
        message: ''
      }
    }
  }
}

applyResolverMid(resolvers, 'Query.getData', (args, context, next) => {
  // do something
  return next()
})

module.exports = { typeDefs, resolvers }

api

applyResolverMid(resolvers, path, fn)

• resolvers: the apollo resolvers you defined
• path: specific resolver path
• fn: the middleware function

middleware

• the first tow arguments are args and context from the graphql resolver
• call next to excute the next middleware

middleware(args, context, next) {
  return next()
}