Unexpected while using graphql

Question

Getting EOF error every time at same line, changed code many times and even degraded to previous versions of graphql but no positive results. My code is:

const graphql = require('graphql')
const _ = require('lodash')
 const {
     GraphQLObjectType,
     GraphQLString,
     GraphQLInt,
     GraphQLSchema
 } = graphql

const users = [
    {id: '1', firstName: 'Ansh', age: 20},
    {id: '2', firstName: 'Ram', age: 21},
    {id: '3', firstName: 'Sham', age: 20}
]

 const UserType = new GraphQLObjectType({
     name: 'User',
     fields: {
        id: {type: GraphQLString},
        firstName: {type: GraphQLString},
        age: {type: GraphQLInt}
     }
 })

 const RootQuery = new GraphQLObjectType({
     name: 'RootQueryType',
          fields: {
             user: {
                 type: UserType,
                 args: {id: {type: GraphQLString}},
                 resolve(parentValue, args) { 
                    return _.find(users, {id: args.id})
                 }
             }
         }
     })

 module.exports = new GraphQLSchema({
    query: RootQuery 
})

Error is:

    {
        "errors": [
        {
            "message": "Syntax Error GraphQL request (30:1) Unexpected <EOF>\n\n29: \n30: \n    ^\n",
            "locations": [
            {
                "line": 30,
                "column": 1
            }
            ]
        }
        ]
    }

Answer 1

The issue is because the query you're passing might be empty.

For example:

curl -X POST http://localhost:4000/graphql \ 
-H "Content-Type: application/json" \
-d '{"query": "{ user { id } }"}'

works fine.

But if you make something like:

curl -X POST http://localhost:4000/graphql \
-H "Content-Type: application/json" \
-d '{"query": ""}'

You'll get unexpected < EOF >

Also, check GraphQL end of line issue.

Answer 2

I had comments in the schema.graphql file:

"""
Some comments
"""

I removed the comments and the Unexpected <EOF> error went away.

Answer 3

It's because there's no actual query so you get unexpected EOF (End of File).

Guessing that you're using GraphiQL (because your EOF message says line 30); you need to add a query on the left-hand panel of GraphiQL in the browser. Something which conforms to your RootQuery like:

{
  user(id: "1") {
    id,
    firstName,
    age
  }
}

Answer 4

I got this error while trying to stitch my schema the reason for this error was that I delcared a type but didn't implemet it, had empty body, for example:

type User {

}

implementing the type fixed it

Answer 5

It looks like if we are doing the schema-first approach, but we do not have any .graphql files in your project/empty. I added this and the error went away:

src/example.graphql

type Query {
  hello: String
}

The "GraphQLError: Syntax Error: Unexpected " error is coming from the graphql package. It looks like @nestjs/graphql is assuming that there will always be at least one .graphql file, so this is probably a bug to try and parse an empty schema vs display a more developer-friendly message or ignore it.

Answer 6

In most cases passing an empty query is caused to this error. To avoid this try this in your graphiql

query { 
   user {
     fields you need to retrieve
  }
}