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@koa/bodyparser

Koa body parsing middleware, based on co-body. support json, form and text type body.

Parse incoming request bodies in a middleware before your handlers, available under the ctx.request.body property.

⚠ Notice: This module doesn't support parsing multipart format data, please use @koa/multer to parse multipart format data.

Install

$ npm i @koa/bodyparser --save

Usage

const Koa = require("koa");
const { bodyParser } = require("@koa/bodyparser");

const app = new Koa();
app.use(bodyParser());

app.use((ctx) => {
  // the parsed body will store in ctx.request.body
  // if nothing was parsed, body will be an empty object {}
  ctx.body = ctx.request.body;
});

Options

• patchNode: patch request body to Node's ctx.req, default is false.

• enableTypes: parser will only parse when request type hits enableTypes, support json/form/text/xml, default is ['json', 'form'].

• encoding: requested encoding. Default is utf-8 by co-body.

• formLimit: limit of the urlencoded body. If the body ends up being larger than this limit, a 413 error code is returned. Default is 56kb.

• jsonLimit: limit of the json body. Default is 1mb.

• textLimit: limit of the text body. Default is 1mb.

• xmlLimit: limit of the xml body. Default is 1mb.

• jsonStrict: when set to true, JSON parser will only accept arrays and objects. Default is true. See strict mode in co-body. In strict mode, ctx.request.body will always be an object(or array), this avoid lots of type judging. But text body will always return string type.

• detectJSON: custom json request detect function. Default is null.

  app.use(
    bodyParser({
      detectJSON(ctx) {
        return /\.json$/i.test(ctx.path);
      },
    })
  );
  

• extendTypes: support extend types:

  app.use(
    bodyParser({
      extendTypes: {
        // will parse application/x-javascript type body as a JSON string
        json: ["application/x-javascript"],
      },
    })
  );
  

• onError: support custom error handle, if koa-bodyparser throw an error, you can customize the response like:

  app.use(
    bodyParser({
      onError(err, ctx) {
        ctx.throw(422, "body parse error");
      },
    })
  );
  

• enableRawChecking: support the already parsed body on the raw request by override and prioritize the parsed value over the sended payload. (default is false)

• parsedMethods: declares the HTTP methods where bodies will be parsed, default ['POST', 'PUT', 'PATCH'].

• disableBodyParser: you can dynamic disable body parser by set ctx.disableBodyParser = true.

  app.use((ctx, next) => {
    if (ctx.path === "/disable") ctx.disableBodyParser = true;
    return next();
  });
  app.use(bodyParser());
  

Raw Body

You can access raw request body by ctx.request.rawBody after koa-bodyparser when:

1. koa-bodyparser parsed the request body.
2. ctx.request.rawBody is not present before koa-bodyparser.

Koa v1.x.x Support

To use koa-bodyparser with koa@1.x.x, please use bodyparser 2.x.

$ npm install koa-bodyparser@2 --save

usage

const Koa = require("koa");
const bodyParser = require("@koa/bodyparser");

const app = new Koa();
app.use(bodyParser());

app.use((ctx) => {
  // the parsed body will store in ctx.request.body
  // if nothing was parsed, body will be an empty object {}
  ctx.body = ctx.request.body;
});

Licences

MIT