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# JSON API Serializer
[](https://travis-ci.org/SeyZ/jsonapi-serializer)
[](https://yarnpkg.com/en/package/jsonapi-serializer)
[](https://yarnpkg.com/en/package/jsonapi-serializer)
A Node.js framework agnostic library for (de)serializing your data to [JSON
API](http://jsonapi.org) (1.0 compliant).
- [Migrate from 2.0 to 3.0](https://github.com/SeyZ/jsonapi-serializer/wiki/Migrate-from-2.0-to-3.0)
- [Migrate from 1.x to 2.0](https://github.com/SeyZ/jsonapi-serializer/wiki/Migrate-from-1.x-to-2.0)
## Installation
`$ npm install jsonapi-serializer`
## Documentation
### Serialization
var JSONAPISerializer = require('jsonapi-serializer').Serializer;
new JSONAPISerializer(type, opts).serialize(data);
The function `JSONAPISerializer` takes two arguments:
- `type`: The resource type.
- `opts`: The serialization options.
Calling the `serialize` method on the returned object will serialize your `data` (object or array) to a compliant JSONAPI document.
#### Available serialization option (`opts` argument)
- **attributes**: An array of attributes to show. You can define an attribute as an option if you want to define some relationships (included or not).
- **ref**: If present, it's considered as a relationships.
- **included**: Consider the relationships as [compound document](http://jsonapi.org/format/#document-compound-documents). Default: true.
- **id**: Configurable identifier field for the resource. Default: `id`.
- **attributes**: An array of attributes to show.
- **topLevelLinks**: An object that describes the top-level links. Values can be *string* or a *function*
- **dataLinks**: An object that describes the links inside data. Values can be *string* or a *function* (see examples below)
- **dataMeta**: An object that describes the meta inside data. Values can be a plain value or a *function* (see examples below)
- **relationshipLinks**: An object that describes the links inside relationships. Values can be *string* or a *function*
- **relationshipMeta**: An object that describes the meta inside relationships. Values can be a plain value or a *function*
- **ignoreRelationshipData**: Do not include the `data` key inside the relationship. Default: false.
- **keyForAttribute**: A function or string to customize attributes. Functions are passed the attribute as a single argument and expect a string to be returned. Strings are aliases for inbuilt functions for common case conversions. Options include: `dash-case` (default), `lisp-case`, `spinal-case`, `kebab-case`, `underscore_case`, `snake_case`, `camelCase`, `CamelCase`.
- **nullIfMissing**: Set the attribute to null if missing from your data input. Default: false.
- **pluralizeType**: A boolean to indicate if the type must be pluralized or not. Default: true.
- **typeForAttribute**: A function that maps the attribute (passed as an argument) to the type you want to override. If it returns `undefined`, ignores the flag for that attribute. Option *pluralizeType* ignored if set.
- **meta**: An object to include non-standard meta-information. Values can be a plain value or a *function*
- **transform**: A function to transform each record before the serialization.
**Examples**
- [Express example](https://github.com/SeyZ/jsonapi-serializer/tree/master/examples/express)
- [Simple usage](#simple-usage-serializer)
- [More examples in tests](https://github.com/SeyZ/jsonapi-serializer/blob/master/test/serializer.js)
Simple usage:
```javascript
var data = [
{ id: 1, firstName: 'Sandro', lastName: 'Munda' },
{ id: 2, firstName: 'John', lastName: 'Doe' }
];
```
```javascript
var JSONAPISerializer = require('jsonapi-serializer').Serializer;
var UserSerializer = new JSONAPISerializer('users', {
attributes: ['firstName', 'lastName']
});
var users = UserSerializer.serialize(data);
// `users` here are JSON API compliant.
```
The result will be something like:
```javascript
{
"data": [{
"type": "users",
"id": "1",
"attributes": {
"first-name": "Sandro",
"last-name": "Munda"
}
}, {
"type": "users",
"id": "2",
"attributes": {
"first-name": "John",
"last-name": "Doe"
}
}]
}
```
### Deserialization
var JSONAPIDeserializer = require('jsonapi-serializer').Deserializer;
new JSONAPIDeserializer(opts).deserialize(data);
The function `JSONAPIDeserializer` takes one argument:
- `opts`: The deserializer options.
Calling the `deserialize` method on the returned object will deserialize your `data` (JSONAPI document) to a plain javascript object.
#### Available deserialization option (`opts` argument)
- **keyForAttribute**: A function or string to customize attributes. Functions are passed the attribute as a single argument and expect a string to be returned. Strings are aliases for inbuilt functions for common case conversions. Options include: `dash-case` (default), `lisp-case`, `spinal-case`, `kebab-case`, `underscore_case`, `snake_case`, `camelCase`, `CamelCase`.
- **AN\_ATTRIBUTE\_TYPE**: this option name corresponds to the type of a relationship from your JSONAPI document.
- **valueForRelationship**: A function that returns whatever you want for a relationship (see examples below) ***can return a Promise (see tests)***
- **transform**: A function to transform each record after the deserialization.
**Examples**
- [Simple usage](#simple-usage-deserializer)
- [Relationship](#relationship-deserializer)
- [More examples in tests](https://github.com/SeyZ/jsonapi-serializer/blob/master/test/deserializer.js)
Simple usage:
```
{
data: [{
type: 'users',
id: '1',
attributes: {
'first-name': Sandro,
'last-name': Munda
}
}, {
type: 'users',
id: '2',
attributes: {
'first-name': 'John',
'last-name': 'Doe'
}
}]
}
```
```javascript
var JSONAPIDeserializer = require('jsonapi-serializer').Deserializer;
new JSONAPIDeserializer().deserialize(jsonapi, function (err, users) {
// `users` is...
});
```
```javascript
[
{ id: 1, firstName: 'Sandro', lastName: 'Munda' },
{ id: 2, firstName: 'John', lastName: 'Doe' }
];
```
Relationship:
```
{
data: [{
type: 'users',
id: '54735750e16638ba1eee59cb',
attributes: {
'first-name': 'Sandro',
'last-name': 'Munda'
},
relationships: {
address: {
data: { type: 'addresses', id: '54735722e16620ba1eee36af' }
}
}
}, {
type: 'users',
id: '5490143e69e49d0c8f9fc6bc',
attributes: {
'first-name': 'Lawrence',
'last-name': 'Bennett'
},
relationships: {
address: {
data: { type: 'addresses', id: '54735697e16624ba1eee36bf' }
}
}
}]
}
```
```javascript
var JSONAPIDeserializer = require('jsonapi-serializer').Deserializer;
new JSONAPIDeserializer({
addresses: {
valueForRelationship: function (relationship) {
return {
id: relationship.id,
'address-line1': '406 Madison Court',
'zip-code': '49426',
country: 'USA'
};
}
}
}).deserialize(jsonapi, function (err, users) {
// `users` is...
});
```
```
[{
id: '54735750e16638ba1eee59cb',
'first-name': 'Sandro',
'last-name': 'Munda',
address: {
id: '54735722e16620ba1eee36af',
'address-line1': '406 Madison Court',
'zip-code': '49426',
country: 'USA'
}
}, {
id: '5490143e69e49d0c8f9fc6bc',
'first-name': 'Lawrence',
'last-name': 'Bennett',
address: {
id: '54735697e16624ba1eee36bf',
'address-line1': '406 Madison Court',
'zip-code': '49426',
country: 'USA'
}
}]
```
#### Notes on Promises
The deserialization option `valueForRelationship` supports returning a `Promise` and so this library uses `Promises` under the hood. `bluebird` was previously used as a dependency, but due to bundle size concerns on both node and the web it was replaced with native promises.
`bluebird` is definitely [more performant](http://bluebirdjs.com/docs/benchmarks.html) than native Promises. If performance is a major concern `Promise` can be globally polyfilled
- node - via `global.Promise = require('bluebird')`
- web - global `Promise` automatically gets assigned when using the [script tag](http://bluebirdjs.com/docs/getting-started.html) to load `bluebird`
## Error serialization
var JSONAPIError = require('jsonapi-serializer').Error;
var error = new JSONAPIError(opts);
The function JSONAPIError takes one argument:
- `opts`: The error options. All options are optional.
#### Available error option (`opts` argument)
- **id**: a unique identifier for this particular occurrence of the problem.
- **status**: the HTTP status code applicable to this problem, expressed as a string value.
- **code**: an application-specific error code, expressed as a string value.
- **title**: a short, human-readable summary of the problem that SHOULD NOT change from occurrence to occurrence of the problem, except for purposes of localization.
- **detail**: a human-readable explanation specific to this occurrence of the problem. Like title, this fields value can be localized.
- **source**: an object containing references to the source of the error, optionally including any of the following members:
- **pointer**: a JSON Pointer [RFC6901] to the associated entity in the request document [e.g. "/data" for a primary data object, or "/data/attributes/title" for a specific attribute].
- **parameter**: a string indicating which URI query parameter caused the error.
- **links**: a links object containing the following members:
- **about**: a link that leads to further details about this particular occurrence of the problem.
- **meta**: a meta object containing non-standard meta-information about the error.
**Examples**
- [Simple usage](#simple-usage-error)
- [More example](https://github.com/SeyZ/jsonapi-serializer/blob/master/test/error.js)
Simple usage:
```javascript
var JSONAPIError = require('jsonapi-serializer').Error;
var errors = new JSONAPIError({
code: '123',
source: { 'pointer': '/data/attributes/first-name' },
title: 'Value is too short',
detail: 'First name must contain at least three characters.'
});
// `errors` here are JSON API compliant.
```
The result will be something like:
```javascript
{
"errors": [
{
"code": "123",
"source": { "pointer": "/data/attributes/first-name" },
"title": "Value is too short",
"detail": "First name must contain at least three characters."
}
]
}
```
# License
[MIT](https://github.com/SeyZ/jsonapi-serializer/blob/master/LICENSE)