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    4.0.0 • Public • Published

    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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    Standard Code Style Known Vulnerabilities Language grade: JavaScript Core Infrastructure Initiative (CII) Best Practices
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    You can read the documentation at:

    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.

    If the body has been parsed as JSON, you can access the original body (e.g. for webhook signature validation) through the request.event.rawBody.


    To install this middleware you can use NPM:

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


    • reviver (function) (default undefined): A reviver parameter may be passed which will be used JSON.parseing the body.

    Sample usage

    import middy from '@middy/core'
    import httpHeaderNormalizer from '@middy/http-header-normalizer'
    import httpJsonBodyParser from '@middy/http-json-body-parser'
    const handler = middy((event, context) => {
      return {}
    // invokes the handler
    const event = {
      headers: {
        'Content-Type': 'application/json'  // It is important that the request has the proper content type.
      body: JSON.stringify({foo: 'bar'})
    handler(event, {}, (_, body) => {,{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) 2017-2022 Luciano Mammino, will Farrell, and the Middy team.

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    npm i @middy/http-json-body-parser


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    • lmammino
    • middyjs
    • willfarrell