Not getting data sent from postman in server.js file from mutation - express

Question

I am using graphql, prisma & express to test simple query & mutation but when I am sending data from postman I am not getting the data sent from postman,
I am sending this mutation to graphql but inside server.js file
mutation{
createUser(user_name:"test"){
user_name
}
}
, I am getting undefined,
In REST API you can use body parser to fix this for json, Is there anything like same to deal with query & mutaion of graphql with prisma & express
const { PrismaClient } = require('#prisma/client');
const express = require('express');
const { graphqlHTTP } = require('express-graphql');
const { makeExecutableSchema } = require('#graphql-tools/schema');
const prisma = new PrismaClient();
const typeDefs = `
type User {
user_name: String
}
type Query {
allUsers: [User!]!
}
type Mutation {
createUser(user_name:String):User
}
`;
const resolvers = {
Query: {
allUsers: () => {
console.log(prisma)
return prisma.user.findMany();
}
},
Mutation:{
createUser:async(user_name)=>{
console.log(user_name)
user={
"user_name":user_name
}
const test= await prisma.user.create({ data: user })
return test
}
}
};
const schema = makeExecutableSchema({
resolvers,
typeDefs,
});
const app = express();
app.use('/graphql', graphqlHTTP({
schema,
}));
app.listen(5000);

Answer 1

Arguments to your GraphQl query/mutation are passed through the second argument (typically defined as args) of your resolver. Update your Mutation like this
Mutation: {
createUser: async (parent, args, context) => {
console.log(args.user_name);
user = {
user_name: args.user_name,
};
const test = await prisma.user.create({ data: user });
return test;
},
},
I was able to run your code as is after this modification.
I would recommend checking out the documentation for express-graphql or some example code to get more familiar with how the library works. This example is a good place to start how to use express, graphql and prisma. It's in typescript but works very similar to what you need.