vukoa-bodyParsePath

process request format for vukoa or koa2, base on co-body. support 'from-data', 'x-www-form-urlencoded', 'raw' type body.

Install

npm install vukoa-bodyparsepatch

Usage

var Koa = require('koa');
var bodyParsePatch = require('vukoa-bodyparsepatch');

var app = new Koa();
app.use(bodyParsePatch({
    multipart: true,
    keepExtensions: true,
    strict: false,
    parsePatch: true,
    enableTypes: ['json', 'form', 'text'],
}));

app.use(async ctx => {
  // the parsed body will store in ctx.request.body
  // if nothing was parsed, body will be an empty object {}
  //if you set Options.parsePatch, you will get ctx.request.query and ctx.request.fields;
  ctx.body = ctx.request.body;
});

Options

• parsePatch: parser will only parse when parsePatch is true, it will create ctx.request.query and ctx.request.fields

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

• 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.

• strict: 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(bodyParsePatch({
    detectJSON: function (ctx) {
      return /\.json$/i.test(ctx.path);
    }
  }));

• extendTypes: support extend types:

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

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

  app.use(bodyParsePatch({
    onerror: function (err, ctx) {
      ctx.throw('body parse error', 422);
    }
  }));

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

app.use(async (ctx, next) => {
  if (ctx.path === '/disable') ctx.disableBodyParser = true;
  await next();
});
app.use(bodyParsePatch());

Raw Body

You can set enableTypes: ['text'] you will get

• if raw body can transfer Json, you will get ctx.request.rawBody and ctx.request.fields = JSON.parse(ctx.request.rawBody)
• else you can only get ctx.request.rawBody

Koa 2 Support