Middy http-json-body-parser middleware

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HTTP json body parser middleware for the middy framework, the stylish Node.js middleware engine for AWS Lambda

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This middleware automatically parses HTTP requests with a JSON body and converts the body into an object. Also handles gracefully broken JSON as UnprocessableEntity (422 errors) if used in combination with httpErrorHandler.

It can also be used in combination with validator as a prior step to normalize the event body input as an object so that the content can be validated.


To install this middleware you can use NPM:

npm install --save @middy/http-json-body-parser


Sample usage

const middy = require('@middy/core')
const httpJsonBodyParser = require('@middy/http-json-body-parser')

const handler = middy((event, context, cb) => {
  cb(null, {})


// invokes the handler
const event = {
  headers: {
    'Content-Type': 'application/json'
  body: JSON.stringify({foo: 'bar'})
handler(event, {}, (_, body) => {
  expect(body).toEqual({foo: 'bar'})

Middy documentation and examples

For more documentation and examples, refers to the main Middy monorepo on GitHub or Middy official website.


Everyone is very welcome to contribute to this repository. Feel free to raise issues or to submit Pull Requests.


Licensed under MIT License. Copyright (c) 2017-2018 Luciano Mammino and the Middy team.

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