Replace your expressGraphQL with graphqlHTTP as it was destructured

[Harrish-Selvarajah]

"express-graphql": "^0.12.0" does not work with the method expressGraphQL, use const { graphqlHTTP } = require('express-graphql'); or const expressGraphQL = require('express-graphql').graphqlHTTP

Refer https://stackoverflow.com/questions/65517979/expressgraphql-is-not-a-function

[bizimunda]

that's true. I had the same issue