Styjun

I'm using GraphQL/express/express-graphql/axios to retrieve specific coin data from the CryptoCompare API.

I have two endpoints:

1) https://min-api.cryptocompare.com/data/pricemultifull?fsyms=BTC,ETH,LTC,BCH,NEO,ETC,XMR&tsyms=USD

From endpoint 1, I want to retrieve the following in USD for 8 coins:
 - FROMSYMBOL, CHANGEPCT24HOUR, PRICE, MKTCAP, TOTALVOLUME24HTO

2) https://min-api.cryptocompare.com/data/coin/generalinfo?fsyms=BTC&tsym=USD

From endpoint 2, I want to retrieve the following just for Bitcoin/BTC:
 - Id, FullName, ImageUrl

I have setup my backend server with two files, as well as testing queries using graphiql.

File 1 - server.js

const express = require("express")
const graphqlHTTP = require("express-graphql")
const cors = require("cors")
const schema = require("./schema")

const app = express()

app.use(cors())

app.use(
 "/graphql",
 graphqlHTTP(
 schema,
 graphiql: true
 )
)

const PORT = process.env.PORT || 4000

app.listen(PORT, console.log(`✅ Listening to port $PORT`))

File 2 - schema.js

const 
 GraphQLObjectType,
 GraphQLList,
 GraphQLID,
 GraphQLInt,
 GraphQLString,
 GraphQLSchema
 = require("graphql")
const axios = require("axios")

const CoinDataType = new GraphQLObjectType(
 name: "CoinData",
 fields: () => (
 FROMSYMBOL: type: GraphQLString ,
 CHANGEPCT24HOUR: type: GraphQLInt ,
 PRICE: type: GraphQLInt ,
 MKTCAP: type: GraphQLInt ,
 TOTALVOLUME24HTO: type: GraphQLInt 
 )
)

const CoinInfoType = new GraphQLObjectType(
 name: "CoinInfo",
 fields: () => (
 Id: type: GraphQLID ,
 FullName: type: GraphQLString ,
 ImageUrl: type: GraphQLString 
 )
)

const Query = new GraphQLObjectType(
 name: "Query",
 fields: 
 CoinData: 
 type: new GraphQLList(CoinDataType),
 resolve(parent, args) 
 return axios
 .get(
 "https://min-api.cryptocompare.com/data/pricemultifull?fsyms=BTC,ETH,LTC,BCH,NEO,ETC,XMR&tsyms=USD"
 )
 .then(res => res.data)
 
 ,
 CoinInfo: 
 type: new GraphQLList(CoinInfoType),
 resolve(parent, args) 
 return axios
 .get(
 "https://min-api.cryptocompare.com/data/coin/generalinfo?fsyms=BTC&tsym=USD"
 )
 .then(res => res.data)
 
 
 
)

module.exports = new GraphQLSchema( query: Query )

When I use graphiql to test my queries with this:

 CoinData 
 FROMSYMBOL
 
 CoinInfo 
 Id
 

...I get this error:

 "errors": [
 
 "message": "Expected Iterable, but did not find one for field Query.CoinInfo.",
 "locations": [
 
 "line": 5,
 "column": 3
 
 ],
 "path": [
 "CoinInfo"
 ]
 ,
 
 "message": "Expected Iterable, but did not find one for field Query.CoinData.",
 "locations": [
 
 "line": 2,
 "column": 3
 
 ],
 "path": [
 "CoinData"
 ]
 
 ],
 "data": 
 "CoinData": null,
 "CoinInfo": null
 

How do I get around this error? Thanks.