fastify-json5

This plugin enable your server to process JSON5 payloads.
It adds a new application/json5 content type parser to Fastify and decorate the reply object with a sendJSON5() utility.

Install

npm install fastify-json5

Compatibility

Plugin version	Fastify version
^2.0.0	^5.0.0
^1.0.0	^4.0.0

Usage

const fastify = require('fastify')
const fastifyJson5 = require('fastify-json5')

const app = fastify()
app.register(fastifyJson5, { 
  reviver: (key, value) => value // optionally pass a reviver function
})

app.post('/', (req, reply) => {
  console.log(req.body)
  reply.sendJSON5(req.body, {
    replacer, // optionally
    space,    // optionally
    quote     // optionally
  })
})

app.inject({
  method: 'POST',
  url: '/',
  headers: { 'content-type': 'application/json5' },
  payload: `{
    // comments
    unquoted: 'and you can quote me on that',
    singleQuotes: 'I can use "double quotes" here',
    lineBreaks: "Look, Mom! \
  No \\n's!",
    hexadecimal: 0xdecaf,
    leadingDecimalPoint: .8675309, andTrailing: 8675309.,
    positiveSign: +1,
    negativeSign: -9,
    trailingComma: 'in objects', andIn: ['arrays',],
    "backwardsCompatible": "with JSON",
  }`
})

Options

This plugin uses the json5 under the hood. So you can provide the same options of the json5 module.

When you register the plugin you can pass the JSON.parse options:

• reviver

When you call the reply.sendJSON5() you can pass the JSON.stringify:

• replacer
• space
• quote

Security

By default, the json5 module behaves like the JSON.parse and JSON.stringify methods. So it parse and add to the prototype the __proto__ property.

This module implements a security check to avoid the __proto__ property to be added to the prototype. In this case the plugin will throw an http 400 error.

License

Copyright Manuel Spigolon, Licensed under MIT.