The boom npm package is a set of utilities for returning HTTP errors. It is part of the hapi ecosystem and provides a way to send error responses that include a friendly error message, the correct HTTP status code, and any additional error information.
Creating HTTP-friendly error objects
Boom allows you to create error objects that are suitable for HTTP responses. For example, you can create a 400 Bad Request error using Boom.badRequest('Invalid request payload input').
{"statusCode": 400, "error": "Bad Request", "message": "Invalid request payload input"}Decorating error objects
Boom provides a way to decorate error objects with additional information. You can add custom data to an error using Boom.badRequest('Invalid request payload input').data({ custom: 'info' }).
{"statusCode": 400, "error": "Bad Request", "message": "Invalid request payload input", "data": {"custom": "info"}}Generating errors for various HTTP status codes
Boom has methods for generating errors corresponding to most HTTP status codes, such as Boom.notFound('Resource not found') for a 404 error, or Boom.internal('An internal server error occurred') for a 500 error.
[{"statusCode": 404, "error": "Not Found", "message": "Resource not found"}, {"statusCode": 500, "error": "Internal Server Error", "message": "An internal server error occurred"}]The http-errors package is similar to boom in that it allows you to create HTTP error objects. It is middleware-friendly and can be used with frameworks like Express. Unlike boom, it does not have a dependency on the hapi ecosystem.
api-error-handler is an Express middleware for handling API errors. It formats error responses in a consistent structure. While it is similar to boom in handling errors, it is specifically designed for Express and is used as middleware rather than a standalone error object generator.
HTTP-friendly error objects
Lead Maintainer: Eran Hammer
reformat(debug)Boom.badRequest([message], [data])Boom.unauthorized([message], [scheme], [attributes])Boom.paymentRequired([message], [data])Boom.forbidden([message], [data])Boom.notFound([message], [data])Boom.methodNotAllowed([message], [data], [allow])Boom.notAcceptable([message], [data])Boom.proxyAuthRequired([message], [data])Boom.clientTimeout([message], [data])Boom.conflict([message], [data])Boom.resourceGone([message], [data])Boom.lengthRequired([message], [data])Boom.preconditionFailed([message], [data])Boom.entityTooLarge([message], [data])Boom.uriTooLong([message], [data])Boom.unsupportedMediaType([message], [data])Boom.rangeNotSatisfiable([message], [data])Boom.expectationFailed([message], [data])Boom.teapot([message], [data])Boom.badData([message], [data])Boom.locked([message], [data])Boom.failedDependency([message], [data])Boom.preconditionRequired([message], [data])Boom.tooManyRequests([message], [data])Boom.illegal([message], [data])boom provides a set of utilities for returning HTTP errors. Each utility returns a Boom
error response object which includes the following properties:
isBoom - if true, indicates this is a Boom object instance. Note that this boolean should
only be used if the error is an instance of Error. If it is not certain, use Boom.isBoom()
instead.isServer - convenience bool indicating status code >= 500.message - the error message.typeof - the constructor used to create the error (e.g. Boom.badRequest).output - the formatted response. Can be directly manipulated after object construction to return a custom
error response. Allowed root keys:
statusCode - the HTTP status code (typically 4xx or 5xx).headers - an object containing any HTTP headers where each key is a header name and value is the header content.payload - the formatted object used as the response payload (stringified). Can be directly manipulated but any
changes will be lost
if reformat() is called. Any content allowed and by default includes the following content:
statusCode - the HTTP status code, derived from error.output.statusCode.error - the HTTP status message (e.g. 'Bad Request', 'Internal Server Error') derived from statusCode.message - the error message derived from error.message.Error properties.The Boom object also supports the following method:
reformat(debug)Rebuilds error.output using the other object properties where:
debug - a Boolean that, when true, causes Internal Server Error messages to be left in tact. Defaults to false, meaning that Internal Server Error messages are redacted.Note that Boom object will return true when used with instanceof Boom, but do not use the
Boom prototype (they are either plain Error or the error prototype passed in). This means
Boom objects should only be tested using instanceof Boom or Boom.isBoom() but not by looking
at the prototype or contructor information. This limitation is to avoid manipulating the prototype
chain which is very slow.
new Boom(message, [options])Creates a new Boom object using the provided message and then calling
boomify() to decorate the error with the Boom properties, where:
message - the error message. If message is an error, it is the same as calling
boomify() directly.options - and optional object where:
statusCode - the HTTP status code. Defaults to 500 if no status code is already set.data - additional error information (assigned to error.data).decorate - an option with extra properties to set on the error object.ctor - constructor reference used to crop the exception call stack output.message is an error object, also supports the other boomify()
options.boomify(err, [options])Decorates an error with the Boom properties where:
err - the Error object to decorate.options - optional object with the following optional settings:
statusCode - the HTTP status code. Defaults to 500 if no status code is already set and err is not a Boom object.message - error message string. If the error already has a message, the provided message is added as a prefix.
Defaults to no message.decorate - an option with extra properties to set on the error object.override - if false, the err provided is a Boom object, and a statusCode or message are provided,
the values are ignored. Defaults to true (apply the provided statusCode and message options to the error
regardless of its type, Error or Boom object).var error = new Error('Unexpected input');
Boom.boomify(error, { statusCode: 400 });
isBoom(err)Identifies whether an error is a Boom object. Same as calling instanceof Boom.
Boom.badRequest([message], [data])Returns a 400 Bad Request error where:
message - optional message.data - optional additional error data.Boom.badRequest('invalid query');
Generates the following response payload:
{
"statusCode": 400,
"error": "Bad Request",
"message": "invalid query"
}
Boom.unauthorized([message], [scheme], [attributes])Returns a 401 Unauthorized error where:
message - optional message.scheme can be one of the following:
attributes - an object of values to use while setting the 'WWW-Authenticate' header. This value is only used
when scheme is a string, otherwise it is ignored. Every key/value pair will be included in the
'WWW-Authenticate' in the format of 'key="value"' as well as in the response payload under the attributes key. Alternatively value can be a string which is use to set the value of the scheme, for example setting the token value for negotiate header. If string is used message parameter must be null.
null and undefined will be replaced with an empty string. If attributes is set, message will be used as
the 'error' segment of the 'WWW-Authenticate' header. If message is unset, the 'error' segment of the header
will not be present and isMissing will be true on the error object.If either scheme or attributes are set, the resultant Boom object will have the
'WWW-Authenticate' header set for the response.
Boom.unauthorized('invalid password');
Generates the following response:
"payload": {
"statusCode": 401,
"error": "Unauthorized",
"message": "invalid password"
},
"headers" {}
Boom.unauthorized('invalid password', 'sample');
Generates the following response:
"payload": {
"statusCode": 401,
"error": "Unauthorized",
"message": "invalid password",
"attributes": {
"error": "invalid password"
}
},
"headers" {
"WWW-Authenticate": "sample error=\"invalid password\""
}
Boom.unauthorized(null, 'Negotiate', 'VGhpcyBpcyBhIHRlc3QgdG9rZW4=');
Generates the following response:
"payload": {
"statusCode": 401,
"error": "Unauthorized",
"attributes": "VGhpcyBpcyBhIHRlc3QgdG9rZW4="
},
"headers" {
"WWW-Authenticate": "Negotiate VGhpcyBpcyBhIHRlc3QgdG9rZW4="
}
Boom.unauthorized('invalid password', 'sample', { ttl: 0, cache: null, foo: 'bar' });
Generates the following response:
"payload": {
"statusCode": 401,
"error": "Unauthorized",
"message": "invalid password",
"attributes": {
"error": "invalid password",
"ttl": 0,
"cache": "",
"foo": "bar"
}
},
"headers" {
"WWW-Authenticate": "sample ttl=\"0\", cache=\"\", foo=\"bar\", error=\"invalid password\""
}
Boom.paymentRequired([message], [data])Returns a 402 Payment Required error where:
message - optional message.data - optional additional error data.Boom.paymentRequired('bandwidth used');
Generates the following response payload:
{
"statusCode": 402,
"error": "Payment Required",
"message": "bandwidth used"
}
Boom.forbidden([message], [data])Returns a 403 Forbidden error where:
message - optional message.data - optional additional error data.Boom.forbidden('try again some time');
Generates the following response payload:
{
"statusCode": 403,
"error": "Forbidden",
"message": "try again some time"
}
Boom.notFound([message], [data])Returns a 404 Not Found error where:
message - optional message.data - optional additional error data.Boom.notFound('missing');
Generates the following response payload:
{
"statusCode": 404,
"error": "Not Found",
"message": "missing"
}
Boom.methodNotAllowed([message], [data], [allow])Returns a 405 Method Not Allowed error where:
message - optional message.data - optional additional error data.allow - optional string or array of strings (to be combined and separated by ', ') which is set to the 'Allow' header.Boom.methodNotAllowed('that method is not allowed');
Generates the following response payload:
{
"statusCode": 405,
"error": "Method Not Allowed",
"message": "that method is not allowed"
}
Boom.notAcceptable([message], [data])Returns a 406 Not Acceptable error where:
message - optional message.data - optional additional error data.Boom.notAcceptable('unacceptable');
Generates the following response payload:
{
"statusCode": 406,
"error": "Not Acceptable",
"message": "unacceptable"
}
Boom.proxyAuthRequired([message], [data])Returns a 407 Proxy Authentication Required error where:
message - optional message.data - optional additional error data.Boom.proxyAuthRequired('auth missing');
Generates the following response payload:
{
"statusCode": 407,
"error": "Proxy Authentication Required",
"message": "auth missing"
}
Boom.clientTimeout([message], [data])Returns a 408 Request Time-out error where:
message - optional message.data - optional additional error data.Boom.clientTimeout('timed out');
Generates the following response payload:
{
"statusCode": 408,
"error": "Request Time-out",
"message": "timed out"
}
Boom.conflict([message], [data])Returns a 409 Conflict error where:
message - optional message.data - optional additional error data.Boom.conflict('there was a conflict');
Generates the following response payload:
{
"statusCode": 409,
"error": "Conflict",
"message": "there was a conflict"
}
Boom.resourceGone([message], [data])Returns a 410 Gone error where:
message - optional message.data - optional additional error data.Boom.resourceGone('it is gone');
Generates the following response payload:
{
"statusCode": 410,
"error": "Gone",
"message": "it is gone"
}
Boom.lengthRequired([message], [data])Returns a 411 Length Required error where:
message - optional message.data - optional additional error data.Boom.lengthRequired('length needed');
Generates the following response payload:
{
"statusCode": 411,
"error": "Length Required",
"message": "length needed"
}
Boom.preconditionFailed([message], [data])Returns a 412 Precondition Failed error where:
message - optional message.data - optional additional error data.Boom.preconditionFailed();
Generates the following response payload:
{
"statusCode": 412,
"error": "Precondition Failed"
}
Boom.entityTooLarge([message], [data])Returns a 413 Request Entity Too Large error where:
message - optional message.data - optional additional error data.Boom.entityTooLarge('too big');
Generates the following response payload:
{
"statusCode": 413,
"error": "Request Entity Too Large",
"message": "too big"
}
Boom.uriTooLong([message], [data])Returns a 414 Request-URI Too Large error where:
message - optional message.data - optional additional error data.Boom.uriTooLong('uri is too long');
Generates the following response payload:
{
"statusCode": 414,
"error": "Request-URI Too Large",
"message": "uri is too long"
}
Boom.unsupportedMediaType([message], [data])Returns a 415 Unsupported Media Type error where:
message - optional message.data - optional additional error data.Boom.unsupportedMediaType('that media is not supported');
Generates the following response payload:
{
"statusCode": 415,
"error": "Unsupported Media Type",
"message": "that media is not supported"
}
Boom.rangeNotSatisfiable([message], [data])Returns a 416 Requested Range Not Satisfiable error where:
message - optional message.data - optional additional error data.Boom.rangeNotSatisfiable();
Generates the following response payload:
{
"statusCode": 416,
"error": "Requested Range Not Satisfiable"
}
Boom.expectationFailed([message], [data])Returns a 417 Expectation Failed error where:
message - optional message.data - optional additional error data.Boom.expectationFailed('expected this to work');
Generates the following response payload:
{
"statusCode": 417,
"error": "Expectation Failed",
"message": "expected this to work"
}
Boom.teapot([message], [data])Returns a 418 I'm a Teapot error where:
message - optional message.data - optional additional error data.Boom.teapot('sorry, no coffee...');
Generates the following response payload:
{
"statusCode": 418,
"error": "I'm a Teapot",
"message": "Sorry, no coffee..."
}
Boom.badData([message], [data])Returns a 422 Unprocessable Entity error where:
message - optional message.data - optional additional error data.Boom.badData('your data is bad and you should feel bad');
Generates the following response payload:
{
"statusCode": 422,
"error": "Unprocessable Entity",
"message": "your data is bad and you should feel bad"
}
Boom.locked([message], [data])Returns a 423 Locked error where:
message - optional message.data - optional additional error data.Boom.locked('this resource has been locked');
Generates the following response payload:
{
"statusCode": 423,
"error": "Locked",
"message": "this resource has been locked"
}
Boom.failedDependency([message], [data])Returns a 424 Failed Dependency error where:
message - optional message.data - optional additional error data.Boom.failedDependency('an external resource failed');
Generates the following response payload:
{
"statusCode": 424,
"error": "Failed Dependency",
"message": "an external resource failed"
}
Boom.preconditionRequired([message], [data])Returns a 428 Precondition Required error where:
message - optional message.data - optional additional error data.Boom.preconditionRequired('you must supply an If-Match header');
Generates the following response payload:
{
"statusCode": 428,
"error": "Precondition Required",
"message": "you must supply an If-Match header"
}
Boom.tooManyRequests([message], [data])Returns a 429 Too Many Requests error where:
message - optional message.data - optional additional error data.Boom.tooManyRequests('you have exceeded your request limit');
Generates the following response payload:
{
"statusCode": 429,
"error": "Too Many Requests",
"message": "you have exceeded your request limit"
}
Boom.illegal([message], [data])Returns a 451 Unavailable For Legal Reasons error where:
message - optional message.data - optional additional error data.Boom.illegal('you are not permitted to view this resource for legal reasons');
Generates the following response payload:
{
"statusCode": 451,
"error": "Unavailable For Legal Reasons",
"message": "you are not permitted to view this resource for legal reasons"
}
All 500 errors hide your message from the end user. Your message is recorded in the server log.
Boom.badImplementation([message], [data]) - (alias: internal)Returns a 500 Internal Server Error error where:
message - optional message.data - optional additional error data.Boom.badImplementation('terrible implementation');
Generates the following response payload:
{
"statusCode": 500,
"error": "Internal Server Error",
"message": "An internal server error occurred"
}
Boom.notImplemented([message], [data])Returns a 501 Not Implemented error where:
message - optional message.data - optional additional error data.Boom.notImplemented('method not implemented');
Generates the following response payload:
{
"statusCode": 501,
"error": "Not Implemented",
"message": "method not implemented"
}
Boom.badGateway([message], [data])Returns a 502 Bad Gateway error where:
message - optional message.data - optional additional error data.Boom.badGateway('that is a bad gateway');
Generates the following response payload:
{
"statusCode": 502,
"error": "Bad Gateway",
"message": "that is a bad gateway"
}
Boom.serverUnavailable([message], [data])Returns a 503 Service Unavailable error where:
message - optional message.data - optional additional error data.Boom.serverUnavailable('unavailable');
Generates the following response payload:
{
"statusCode": 503,
"error": "Service Unavailable",
"message": "unavailable"
}
Boom.gatewayTimeout([message], [data])Returns a 504 Gateway Time-out error where:
message - optional message.data - optional additional error data.Boom.gatewayTimeout();
Generates the following response payload:
{
"statusCode": 504,
"error": "Gateway Time-out"
}
Q How do I include extra information in my responses? output.payload is missing data, what gives?
A There is a reason the values passed back in the response payloads are pretty locked down. It's mostly for security and to not leak any important information back to the client. This means you will need to put in a little more effort to include extra information about your custom error. Check out the "Error transformation" section in the hapi documentation.
FAQs
HTTP-friendly error objects
The npm package boom receives a total of 1,557,220 weekly downloads. As such, boom popularity was classified as popular.
We found that boom demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 5 open source maintainers collaborating on the project.
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