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    2.0.8 • Public • Published

    koa-better-body The MIT License npm downloads

    Full-featured koa body parser! Support parsing text, buffer, json, json patch, json api, csp-report, multipart, form and urlencoded bodies. Works for koa@1, koa@2 and will work for koa@3.

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    You might also be interested in our recipes - working examples, answers, tips & tricks. Contribute a recipe?


    npm i koa-better-body --save



    For more use-cases see the tests

    const koaBetterBody = require('koa-better-body')


    Robust body parser for koa@1, also works for koa@2 (with deprecations). Will also work for future koa@3 with koa-convert.


    • options {Object}: see more on options section
    • returns {GeneratorFunction}


    var koa = require('koa')
    var body = require('koa-better-body')
    var app = koa()
      .use(function * () {
      .listen(8080, function () {
        console.log('koa server start listening on port 8080')


    Sane defaults. ✨

    Accepts JSON, JSON API v1, text, buffer, csp-report, multipart and urlencoded/form bodies. If you want to disallow accepting and parsing multipart body you should pass multipart: false. Most of the defaults you can see at utils.defaultOptions and utils.defaultTypes. All options are also been passed to formidable.IncomingForm! Even you can pass IncomingForm instance to be able to handle the different formidable events.

    • fields {Boolean|String}: Default false, which means it will set fields on this.request.fields and directly on this.body. If you pass a string, for example 'foo', you will have fields on this.body and on
    • files {Boolean|String}: Default false, which means it will set files on this.request.files and this.body.files, if you pass a string, for example 'bar', it will set files on and
    • multipart {Boolean}: Default true. If you pass false it won't accept/parse multipart bodies.
    • textLimit {String}: Default '100kb'. Passed to bytes.parse method.
    • formLimit {String}: Default '100kb'. Passed to bytes.parse method.
    • jsonLimit {String}: Default '100kb'. Passed to bytes.parse method.
    • bufferLimit {String}: Default '1mb'. Passed to bytes.parse method.
    • jsonStrict {Boolean}: Default true. When set to true, JSON parser will only accept arrays and objects.
    • detectJSON {Function}: Custom JSON request detect function - detectJSON(ctx).
    • strict {Boolean}: Default true. Pass false if you want to allow parsing GET, DELETE and HEAD requests.
    • onerror {Function}: Custom error handle, if throw an error, you can customize the response - onerror(err, ctx).
    • extendTypes {Object}: Default accepting types can find on utils.defaultTypes function. Allowing you to extend what your app can accept. By default works for JSON, JSON API v1, multipart, text, urlencoded and csp-report.
    • IncomingForm {IncomingForm}: Pass an instance of formidable.IncomingForm to be able to handle formidable events.

    A note about strict mode

    We are trying to follow standards. 🐈

    You can pass strict:false, but see IETF HTTP/1.1 Message Semantics: Section 6.1 to understand why we stay to "strict mode" by default. GET, HEAD, and DELETE requests have no defined semantics for the request body, but this doesn't mean they may not be valid in certain use cases. Last two tests at test/options.js are showing usage on non-strict and strict mode.


    You might also be interested in these packages:


    Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.
    But before doing anything, please read the guidelines.

    Contributing Recipes

    Recipes are just different use cases, written in form of README in human language. Showing some "Pro Tips" and tricks, answering common questions and so on. They look like tests, but in more readable and understandable way for humans - mostly for beginners that not reads or understand enough the README or API and tests.

    • They are in form of folders in the root recipes/ folder: for example recipes/[short-meaningful-recipe-name]/.
    • In recipe folder should exist file: see recipes/multipart/
    • The examples from the recipe should also exist as separate .js files.
    • Examples in recipe folder also should be working and actual.

    It would be great if you follow these steps when you want to fix, update or create a recipes. 😎

    • Title for recipe idea should start with [recipe]: for example[recipe] my awesome recipe
    • Title for new recipe (PR) should also start with [recipe].
    • Titles of Pull Requests or Issues for fixing/updating some existing recipes should start with [recipe-fix].

    It will help a lot, thanks in advance! 😋

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