The graphql/error module is responsible for creating and formatting GraphQL errors. You can import either from the graphql/error module, or from the root graphql module. For example:

import { GraphQLError } from 'graphql'; // ES6
var { GraphQLError } = require('graphql'); // CommonJS




class GraphQLError extends Error {
   message: string,
   nodes?: Array<any>,
   stack?: ?string,
   source?: Source,
   positions?: Array<number>,
   originalError?: ?Error,
   extensions?: ?{ [key: string]: mixed }

A representation of an error that occurred within GraphQL. Contains information about where in the query the error occurred for debugging. Most commonly constructed with locatedError below.


function syntaxError(
  source: Source,
  position: number,
  description: string
): GraphQLError;

Produces a GraphQLError representing a syntax error, containing useful descriptive information about the syntax error's position in the source.


function locatedError(error: ?Error, nodes: Array<any>): GraphQLError {

Given an arbitrary Error, presumably thrown while attempting to execute a GraphQL operation, produce a new GraphQLError aware of the location in the document responsible for the original Error.


function formatError(error: GraphQLError): GraphQLFormattedError

type GraphQLFormattedError = {
  message: string,
  locations: ?Array<GraphQLErrorLocation>

type GraphQLErrorLocation = {
  line: number,
  column: number

Given a GraphQLError, format it according to the rules described by the Response Format, Errors section of the GraphQL Specification.