# serialize-error

> Serialize/deserialize an error into a plain object

Useful if you for example need to `JSON.stringify()` or `process.send()` the error.

## Install

```
$ npm install serialize-error
```

## Usage

```js
const {serializeError, deserializeError} = require('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: 🦄]
```

## API

### serializeError(value, options?)

Type: `Error | unknown`

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.

`.toJSON` example:

```js
class ErrorWithDate extends Error {
    constructor() {
        super();
        this.date = new Date();
    }
}
const error = new ErrorWithDate();
serializeError(date);
// => {date: '1970-01-01T00:00:00.000Z', name, message, stack}

class ErrorWithToJSON extends Error {
    constructor() {
        super('🦄');
        this.date = new Date();
    }

    toJSON() {
        return serializeError(this);
    }
}
const error = new ErrorWithToJSON();
console.log(serializeError(error));
// => {date: '1970-01-01T00:00:00.000Z', message: '🦄', name, stack}
```

### deserializeError(value, options?)

Type: `{[key: string]: unknown} | unknown`

Deserialize a plain object or any value into an `Error` object.

`Error` objects are passed through.
Non-error values are wrapped in a `NonError` error.
Custom properties are preserved.
Circular references are handled.

### options

Type: `object`

#### maxDepth

Type: `number`\
Default: `Number.POSITIVE_INFINITY`

The maximum depth of properties to preserve when serializing/deserializing.

```js
const {serializeError} = require('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: {}}}
```