@tinyanvil/http-multipart-body-parser
v1.0.1
Published
Http event normalizer middleware for the middy framework
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Middy http-multipart-body-parser middleware
Automatically parses HTTP requests with content type multipart/form-data
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 so that the content can be validated.
Note: by default this is going to parse only events that contain the header Content-Type
(or content-type
) set to multipart/form-data
. If you want to support different casing for the header name (e.g. Content-type
) then you should use the httpHeaderNormalizer
middleware before this middleware.
Install
To install this middleware you can use NPM:
npm install --save @middy/http-multipart-body-parser
Options
busboy
(object) (optional): defaults to{}
and it can be used to pass extraparameters to the internalbusboy
instance at creation time. Checkout the official documentation for more information on the supported options.
Note: this middleware will buffer all the data as it is processed internally by busboy
, so, if you are using this approach to parse significantly big volumes of data, keep in mind that all the data will be allocated in memory. This is somewhat inevitable with Lambdas (as the data is already encoded into the JSON in memory as Base64), but it's good to keep this in mind and evaluate the impact on you application.
If you really have to deal with big files, then you might also want to consider to allowing your users to directly upload files to S3
Sample usage
const middy = require('@middy/core')
const { httpMultipartBodyParser } = require('@middy/http-multipart-body-parser')
const handler = middy((event, context, cb) => {
cb(null, {})
})
handler.use(httpMultipartBodyParser())
// invokes the handler
const event = {
headers: {
'content-type': 'multipart/form-data; boundary=----WebKitFormBoundaryppsQEwf2BVJeCe0M'
},
body: 'LS0tLS0tV2ViS2l0Rm9ybUJvdW5kYXJ5cHBzUUV3ZjJCVkplQ2UwTQ0KQ29udGVudC1EaXNwb3NpdGlvbjogZm9ybS1kYXRhOyBuYW1lPSJmb28iDQoNCmJhcg0KLS0tLS0tV2ViS2l0Rm9ybUJvdW5kYXJ5cHBzUUV3ZjJCVkplQ2UwTS0t',
isBase64Encoded: true
}
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.
Contributing
Everyone is very welcome to contribute to this repository. Feel free to raise issues or to submit Pull Requests.
License
Licensed under MIT License. Copyright (c) 2017-2018 Luciano Mammino and the Middy team.