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File uploads

Enabling file uploads in Apollo Server

For server integrations that support file uploads (e.g. Express, hapi, Koa), Apollo Server enables file uploads by default. To enable file uploads, reference the Upload type in the schema passed to the Apollo Server construction.

const { ApolloServer, gql } = require('apollo-server');

const typeDefs = gql`
  type File {
    filename: String!
    mimetype: String!
    encoding: String!

  type Query {
    uploads: [File]

  type Mutation {
    singleUpload(file: Upload!): File!

const resolvers = {
  Query: {
    uploads: (parent, args) => {},
  Mutation: {
    singleUpload: (parent, args) => {
      return args.file.then(file => {
        //Contents of Upload scalar: https://github.com/jaydenseric/graphql-upload#class-graphqlupload
        //file.createReadStream() is a readable node stream that contains the contents of the uploaded file
        //node stream api: https://nodejs.org/api/stream.html
        return file;

const server = new ApolloServer({

server.listen().then(({ url }) => {
  console.log(`🚀 Server ready at ${url}`);

Note: When using typeDefs, Apollo Server adds scalar Upload to your schema, so any existing declaration of scalar Upload in the type definitions should be removed. If you create your schema with makeExecutableSchema and pass it to ApolloServer constructor using the schema param, make sure to include scalar Upload.

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