When you use an unknown keyword, the GraphQL backend will respond with a suggestion related to its schema.
{
"message": "Cannot query field \"one\" on type \"Query\". Did you mean \"node\"?",
}You can also try to bruteforce known keywords, field and type names using wordlists such as [Escape-Technologies/graphql-wordlist](https://github.com/Escape-Technologies/graphql-wordlist) when the schema of a GraphQL API is not accessible.
Source: GraphQL Injection/README.md in PayloadsAllTheThings. From PayloadsAllTheThings by Swissky and contributors. MIT License, Copyright (c) 2019 Swissky.