📣 GraphQLConf 2024 • Sept 10-12 • San Francisco • Check out the Schedule & Get Your Ticket • Read more
GraphQL.JS Tutorial


The graphql/validation module fulfills the Validation phase of fulfilling a GraphQL result. You can import either from the graphql/validation module, or from the root graphql module. For example:

import { validate } from "graphql/validation" // ES6
var { validate } = require("graphql/validation") // CommonJS




function validate(
  schema: GraphQLSchema,
  ast: Document,
  rules?: any[]
): GraphQLError[]

Implements the “Validation” section of the spec.

Validation runs synchronously, returning an array of encountered errors, or an empty array if no errors were encountered and the document is valid.

A list of specific validation rules may be provided. If not provided, the default list of rules defined by the GraphQL specification will be used.

Each validation rules is a function which returns a visitor (see the language/visitor API). Visitor methods are expected to return GraphQLErrors, or Arrays of GraphQLErrors when invalid.

Visitors can also supply visitSpreadFragments: true which will alter the behavior of the visitor to skip over top level defined fragments, and instead visit those fragments at every point a spread is encountered.


let specifiedRules: Array<(context: ValidationContext) => any>

This set includes all validation rules defined by the GraphQL spec