Serialize/deserialize an error into a plain object
Useful if you for example need to JSON.stringify() or process.send() the error.
npm install serialize-errorimport {serializeError, deserializeError} from 'serialize-error';
const error = new Error('🦄');
console.log(error);
//=> [Error: 🦄]
const serialized = serializeError(error);
console.log(serialized);
//=> {name: 'Error', message: '🦄', stack: 'Error: 🦄\n at Object.<anonymous> …'}
const deserialized = deserializeError(serialized);
console.log(deserialized);
//=> [Error: 🦄]When a serialized error with a known name is encountered, it will be deserialized using the corresponding error constructor, while unknown error names will be deserialized as regular errors:
import {deserializeError} from 'serialize-error';
const known = deserializeError({
name: 'TypeError',
message: '🦄'
});
console.log(known);
//=> [TypeError: 🦄] <-- Still a TypeError
const unknown = deserializeError({
name: 'TooManyCooksError',
message: '🦄'
});
console.log(unknown);
//=> [Error: 🦄] <-- Just a regular ErrorThe list of known errors can be extended globally. This also works if serialize-error is a sub-dependency that's not used directly.
import {errorConstructors} from 'serialize-error';
import {MyCustomError} from './errors.js'
errorConstructors.set('MyCustomError', MyCustomError)Warning: Only simple and standard error constructors are supported, like new MyCustomError(message). If your error constructor requires a second parameter or does not accept a string as first parameter, adding it to this map will break the deserialization.
Serialize an Error object into a plain object.
- Non-error values are passed through.
- Custom properties are preserved.
- Non-enumerable properties are kept non-enumerable (name, message, stack).
- Enumerable properties are kept enumerable (all properties besides the non-enumerable ones).
- Buffer properties are replaced with
[object Buffer]. - Circular references are handled.
- If the input object has a
.toJSON()method, then it's called instead of serializing the object's properties. - It's up to
.toJSON()implementation to handle circular references and enumerability of the properties.
Type: Error | unknown
import {serializeError} from 'serialize-error';
class ErrorWithDate extends Error {
constructor() {
super();
this.date = new Date();
}
}
const error = new ErrorWithDate();
serializeError(error);
// => {date: '1970-01-01T00:00:00.000Z', name, message, stack}import {serializeError} from 'serialize-error';
const error = new Error('Unicorn');
error.horn = {
toJSON() {
return 'x';
}
};
serializeError(error);
// => {horn: 'x', name, message, stack}Deserialize a plain object or any value into an Error object.
Errorobjects are passed through.- Objects that have at least a
messageproperty are interpreted as errors. - All other values are wrapped in a
NonErrorerror. - Custom properties are preserved.
- Non-enumerable properties are kept non-enumerable (name, message, stack, cause).
- Enumerable properties are kept enumerable (all properties besides the non-enumerable ones).
- Circular references are handled.
- Native error constructors are preserved (TypeError, DOMException, etc) and more can be added.
Type: {message: string} | unknown
Type: object
Type: number
Default: Number.POSITIVE_INFINITY
The maximum depth of properties to preserve when serializing/deserializing.
import {serializeError} from 'serialize-error';
const error = new Error('🦄');
error.one = {two: {three: {}}};
console.log(serializeError(error, {maxDepth: 1}));
//=> {name: 'Error', message: '🦄', one: {}}
console.log(serializeError(error, {maxDepth: 2}));
//=> {name: 'Error', message: '🦄', one: { two: {}}}Type: boolean
Default: true
Indicate whether to use a .toJSON() method if encountered in the object. This is useful when a custom error implements its own serialization logic via .toJSON() but you prefer to not use it.
Predicate to determine whether a value looks like an error, even if it's not an instance of Error. It must have at least the name, message, and stack properties.
import {isErrorLike} from 'serialize-error';
const error = new Error('🦄');
error.one = {two: {three: {}}};
isErrorLike({
name: 'DOMException',
message: 'It happened',
stack: 'at foo (index.js:2:9)',
});
//=> true
isErrorLike(new Error('🦄'));
//=> true
isErrorLike(serializeError(new Error('🦄'));
//=> true
isErrorLike({
name: 'Bluberricious pancakes',
stack: 12,
ingredients: 'Blueberry',
});
//=> false
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