I built a GraphQL server as follows,
import express from 'express';
import graphqlHTTP from 'express-graphql';
import { schema } from './data/schema';
const app = express();
app.use(express.static(__dirname + '/public'));
app.get('/', function(req, res) {
res.sendFile('index.html');
});
app.use('/graphql', graphqlHTTP({
schema: schema,
graphiql: true
}));
app.listen(8081, () => {
console.log('Running server on port localhost:8081/graphql');
});
And I can make a POST call from Postman like below,
However, when I try to call the API with fetch in the app.js file which is loaded in the index.html as follows,
function fetchQuery(query) {
return fetch('/graphql', {
method: 'POST',
header: {
'Content-Type': 'application/json'
},
body: JSON.stringify({ query })
}).then(response => {
return response.json();
});
}
const query = `{
friend {
firstName
}
}`;
fetchQuery(query).then((data) => {
console.log(data);
});
It says the following errors,
app.js:2 POST http://localhost:8081/graphql 400 (Bad Request)
and response error message: "Must provide query string."