Unexpected <EOF> while using graphql - graphql-js

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
}
}

Answer 7

This is because your graphql.gql looks like this:
# ------------------------------------------------------
# THIS FILE WAS AUTOMATICALLY GENERATED (DO NOT MODIFY)
# ------------------------------------------------------
directive #key(fields: String!) on OBJECT | INTERFACE
directive #extends on OBJECT | INTERFACE
directive #external on OBJECT | FIELD_DEFINITION
directive #requires(fields: String!) on FIELD_DEFINITION
directive #provides(fields: String!) on FIELD_DEFINITION
One thing you can do is create a dummy resolver.
// src/graphql/resolvers/user.resolver.ts
import { Resolver, Query } from '#nestjs/graphql';
import { User } from 'models/User.model';
#Resolver(() => User)
export class UserResolver {
#Query(() => User)
async ids() {
return [];
}
}
and create a graphql model:
// src/graphql/models
import { Field, ObjectType } from '#nestjs/graphql';
#ObjectType()
export class User {
#Field()
createdAt: Date;
}
And make sure that resolver is imported by a module and the module is added to App.module
This should fix it!

Answer 8

In my case on the frontend side (Angular), since I just wanted to observe something, I have this code:
I got this error:
Error: Unexpected <EOF>.
and I made it comment-line and the error was gone

Answer 9

How to fix it: Go to node_mudules > graphql > syntaxError.js and delete all comments from this file and the error should be gone.