Easy GraphQL Format Error is a node library used to handle the errors and return them with the respective status code.
$ npm install easygraphql-format-error --saveTo get started with the format error, you might need to follow the next steps:
// App.js
const FormatError = require('easygraphql-format-error')
const formatError = new FormatError()
// pass the errorName on the context
const errorName = formatError.errorName
app.use('/graphql', (req, res) => {
graphqlHTTP({
schema,
rootValue: root,
graphiql: true,
context: { errorName },
formatError: (err) => {
return formatError.getError(err)
}
})(req, res)
})
// Resolver
userInformation: ({ isLoggedIn }, { errorName }) => {
if (!isLoggedIn) {
throw new Error(errorName.UNAUTHORIZED)
}
return 'My username'
}
// If the user is not loggedIn the response will be
{
"errors": [
{
"message": "Unauthorized",
"statusCode": 401
}
],
"data": null
}You can pass custom error and access those errors from the resolver, calling errorName.YOUR_ERROR_NAME
// App.js
const FormatError = require('easygraphql-format-error')
const formatError = new FormatError([{
name: 'INVALID_EMAIL',
message: 'The email is not valid',
statusCode: '400'
}])
// pass the errorName on the context
const errorName = formatError.errorName
app.use('/graphql', (req, res) => {
graphqlHTTP({
schema,
rootValue: root,
graphiql: true,
context: { errorName },
formatError: (err) => {
return formatError.getError(err)
}
})(req, res)
})
// Resolver
findUserByEmail: ({ email }, { errorName }) => {
const re = /\S+@\S+\.\S+/;
if (!re.test(email)) {
throw new Error(errorName.INVALID_EMAIL)
}
return email
}
// If the email is not valid the response will be
{
"errors": [
{
"message": "The email is not valid",
"statusCode": "400"
}
],
"data": null
}Here is an Example that can be useful!
BAD_REQUEST: {
message: 'Bad Request',
statusCode: 400
},
UNAUTHORIZED: {
message: 'Unauthorized',
statusCode: 401
},
PAYMENT_REQUIRED: {
message: 'Payment Required',
statusCode: 402
},
FORBIDDEN: {
message: 'Forbidden',
statusCode: 403
},
NOT_FOUND: {
message: 'Not Found',
statusCode: 404
},
METHOD_NOT_ALLOWED: {
message: 'Method Not Allowed',
statusCode: 405
},
NOT_ACCEPTABLE: {
message: 'Not Acceptable',
statusCode: 406
},
PROXY_AUTHENTICATION_REQUIRED: {
message: 'Proxy Authentication Required',
statusCode: 407
},
REQUEST_TIMEOUT: {
message: 'Request Timeout',
statusCode: 408
},
CONFLICT: {
message: 'Conflict',
statusCode: 409
},
GONE: {
message: 'Gone',
statusCode: 410
},
LENGTH_REQUIRED: {
message: 'Length Required',
statusCode: 411
},
PRECONDITION_FAILED: {
message: 'Precondition Failed',
statusCode: 412
},
PAYLOAD_TOO_LARGE: {
message: 'Payload Too Large',
statusCode: 413
},
URI_TOO_LONG: {
message: 'URI Too Long',
statusCode: 414
},
UNSUPPORTED_MEDIA_TYPE: {
message: 'Unsupported Media Type',
statusCode: 415
},
RANGE_NOT_SATISFIABLE: {
message: 'Range Not Satisfiable',
statusCode: 416
},
EXPECTATION_FAILED: {
message: 'Expectation Failed',
statusCode: 417
},
IM_A_TEAPOT: {
message: 'I\'m a teapot',
statusCode: 418
},
MISDIRECTED_REQUEST: {
message: 'Misdirected Request',
statusCode: 421
},
UNPROCESSABLE_ENTITY: {
message: 'Unprocessable Entity',
statusCode: 422
},
LOCKED: {
message: 'Locked',
statusCode: 423
},
FAILED_DEPENDENCY: {
message: 'Failed Dependency',
statusCode: 424
},
UNORDERED_COLLECTION: {
message: 'Unordered Collection',
statusCode: 425
},
UPGRADE_REQUIRED: {
message: 'Upgrade Required',
statusCode: 426
},
PRECONDITION_REQUIRED: {
message: 'Precondition Required',
statusCode: 428
},
TOO_MANY_REQUESTS: {
message: 'Too Many Requests',
statusCode: 429
},
REQUEST_HEADER_FIELDS_TOO_LARGE: {
message: 'Request Header Fields Too Large',
statusCode: 431
},
UNAVAILABLE_FOR_LEGAL_REASONS: {
message: 'Unavailable For Legal Reasons',
statusCode: 451
},
INTERNAL_SERVER_ERROR: {
message: 'Internal Server Error',
statusCode: 500
},
NOT_IMPLEMENTED: {
message: 'Not Implemented',
statusCode: 501
},
BAD_GATEWAY: {
message: 'Bad Gateway',
statusCode: 502
},
SERVICE_UNAVAILABLE: {
message: 'Service Unavailable',
statusCode: 503
},
GATEWAY_TIMEOUT: {
message: 'Gateway Timeout',
statusCode: 504
},
HTTP_VERSION_NOT_SUPPORTED: {
message: 'HTTP Version Not Supported',
statusCode: 505
},
VARIANT_ALSO_NEGOTIATES: {
message: 'Variant Also Negotiates',
statusCode: 506
},
INSUFFICIENT_STORAGE: {
message: 'Insufficient Storage',
statusCode: 507
},
LOOP_DETECTED: {
message: 'Loop Detected',
statusCode: 508
},
BANDWIDTH_LIMIT_EXCEEDED: {
message: 'Bandwidth Limit Exceeded',
statusCode: 509
},
NOT_EXTENDED: {
message: 'Not Extended',
statusCode: 510
},
NETWORK_AUTHENTICATION_REQUIRED: {
message: 'Network Authentication Required',
statusCode: 511
}
if the error to throw is UNAUTHORIZED just do throw new Error(errorName.UNAUTHORIZED)
and the result will be:
{
"errors": [
{
"message": 'Unauthorized',
"statusCode": 401
}
],
"data": null
}
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