graphql/error

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

Overview

• class GraphQLError A representation of an error that occurred within GraphQL.

• function syntaxError Produces a GraphQLError representing a syntax error.

• function locatedError Produces a new GraphQLError aware of the location responsible for the error.

• function formatError Format an error according to the rules described by the Response Format.

Errors

GraphQLError

class GraphQLError extends Error {
  constructor(
    message: string,
    nodes?: any[],
    stack?: string,
    source?: Source,
    positions?: 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.

syntaxError

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.

locatedError

function locatedError(error: Error, nodes: 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.

formatError

function formatError(error: GraphQLError): GraphQLFormattedError;
 
type GraphQLFormattedError = {
  message: string;
  locations: 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.