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then-busboy

Promise-based wrapper around Busboy. Processes multipart/form-data request body and returns it in a single object.

5.2.1

MIT

TypeScript

14.49 kB

65,723 2.8

Installations

npm install then-busboy

Developer Guide

BETA

Typescript

Yes

Module System

CommonJS, ESM

Min. Node Version

>= 12.4

Node Version

18.7.0

NPM Version

8.15.0 Score

70.6

Supply Chain

32.7

Quality

75.2

Maintenance

Vulnerability

99.6

License

Pull Requests

Open

0

Total

30

Closed

10

Merged

20

Issues

Open

0

Total

5

Closed

5

Releases

5.2.1

v5.2.1

Updated on Sep 06, 2022

5.2.0

v5.2.0

Updated on May 24, 2022

5.1.3

v5.1.3

Updated on May 18, 2022

5.1.2

v5.1.2

Updated on May 17, 2022

5.1.1

v5.1.1

Updated on Oct 19, 2021

5.1.0

v5.1.0

Updated on Aug 13, 2021

View All 18 releases

Languages

TypeScript

JavaScript

TypeScript (99.57%)

JavaScript (0.43%)

Developer

octet-stream

Download Statistics

Total Downloads

65,723

Last Day

Last Week

129

Last Month

535

Last Year

5,350

GitHub Statistics

MIT License

9 Stars

529 Commits

3 Forks

1 Watchers

3 Branches

4 Contributors

Updated on Oct 25, 2023

Bundle Size

53.46 kB

Minified

14.49 kB

Minified + Gzipped

Bundlephobia

Maintainers

View All 4 Contributors

Package Meta Information

Latest Version

5.2.1

Package Id

then-busboy@5.2.1

Unpacked Size

76.27 kB

Size

16.42 kB

File Count

NPM Version

8.15.0

Node Version

18.7.0

Total Downloads

Cumulative downloads

Total Downloads

65,723

Last Day

100%

Compared to previous day

Last Week

55.4%

129

Compared to previous week

Last Month

8.5%

535

Compared to previous month

Last Year

-0.4%

5,350

Compared to previous year

Weekly Downloads

Monthly Downloads

Yearly Downloads

then-busboy

Promise-based wrapper around Busboy. Processes multipart/form-data request body and returns it in a single object.

Installation

You can install then-busboy from npm:

npm install --save then-busboy

Or with yarn:

yarn add then-busboy

Usage

Because then-busboy can process multipart/form-data bodies from AsyncIterable sources, you can use it with different HTTP frameworks, or with Node.js http module, or even with Response object (see the 4th example).

Let's take a look at the example with http module from Node.js. We'll write a simple server that will parse form-data request, read files content and then send them back as JSON:

1import {createServer} from "http"
2import {parse} from "then-busboy"
3
4const handler = (req, res) => parse(req)
5  .then(async body => {
6    const result = []
7    for (const [path, value] of body) {
8      result.push([path, isFile(value) ? await value.text() : value])
9    }
10
11    res.setHeader("Content-Type", "application/json")
12    res.end(JSON.stringify(Body.json(result)))
13  })
14  .catch(error => {
15    res.statusCode = error.status || 500
16    res.end(error.message)
17  })
18
19createServer(handler)
20  .listen(2319, () => console.log("Server started on http://localhost:2319"))

Note: You can use asynchronous function syntax, because then-busboy always returns a Promise.

Miniaml multipart middleware implementation for Koa.js:

1import {parse} from "then-busboy"
2
3async function multipart(ctx, next) {
4  if (["post", "put"].includes(ctx.method.toLowerCase()) === false) {
5    return next()
6  }
7
8  if (ctx.is("multipart/form-data") === false) {
9    return next()
10  }
11
12  const body = await parse(ctx.req)
13
14  ctx.request.body = body.json()
15
16  return next()
17}
18
19export default multipart

You can also use AsyncIterable value as the input. That way you can parse FormData from other that just HTTP requests. Let's take a loook at the example with form-data-encoder and formdata-node as the input:

1import {fileFromPath} from "formdata-node/file-from-path"
2import {FormDataEncoder} from "form-data-encoder"
3import {FormData} from "formdata-node"
4import {parse} from "then-busboy"
5
6const form = new FormData()
7
8form.set("greeting", "Hello, World!")
9form.set("file", new File(["On Soviet Moon landscape see binoculars through YOU"], "file.txt"))
10form.set("fileFromPath", await fileFromPath("path/to/a/file"))
11
12const encoder = new FormDataEncoder(form)
13
14const body = await parse(encoder, {
15  headers: {
16    "content-type": encoder.contentType
17  }
18})
19
20console.log(body.json()) // -> {greeting: string, file: BodyFile, fileFromPath: BodyFile}

Because then-busboy accepts AsyncIterable as the input, you can also read Response body like that:

1import {Response, FormData} from "node-fetch"
2import {parse} from "then-bosboy"
3const form = new FormData()
4
5form.set("greeting", "Hello, World!")
6form.set("file", new File(["On Soviet Moon landscape see binoculars through YOU"], "file.txt"))
7
8const response = new Respone(form)
9// then-busboy will parse the input and return its own Body instance from which you can create a complete object by calling .json() method or a FormData using .formData() method.
10// The difference with Response.formData() is that then-busboy will save all files to file system and create a *reference* to each of them,
11// while Response (currently) will dump them into RAM, which can be less efficient in some scenarious
12const body = await parse(response.body, {
13  headers: {
14    "content-type": response.headers.get("content-type")
15  }
16})
17
18body.json() // -> {greeting: string, file: BodyFile}
19body.formData() // -> FormData

API

`parse(source[, options]) -> {Promise<Body>}`

{AsyncIterable} source – Incoming HTTP multipart/form-data source.
{object} [options = {}]
- {boolean} castTypes – allow to restore type of each value (default – true)
- more information about busboy options here.

`class Body`

`constructor(entries) -> {Body}`

Create an object that allows to manipulate FormData fields taken then-busboy

Static methods

`from(entries) -> {Body}`

Create a new Body from given entries. An alias of new Body(entries)

{Array<[string[], any]>} entries – an array of Body initial path-value pairs taken from then-busboy

`json(value) -> {object}`

Return an object with data taken from given entries or Body

{Body | Array<[string[], any]>} – return an object from given Body or entries

`formData(value) -> {FormData}`

Return a FormData instance with data taken from given entries or Body

{Body | Array<[string[], any]>} – return an FormData from given Body or entries

Instance properties

`length -> {number}`

Return an amount of entries and files in current Body instance

Instance methods

`fields() -> {Body}`

Return a new Body that contains fields only

`files() -> {Body}`

Return a new Body that contains files only

`json() -> {object}`

Return an object with data taken the current Body instance

`formData() -> {FormData}`

Return a FormData with data taken the current Body instance

`entries() -> {Array<[string[], any]>}`

Return an array of entries in current Body instance

`values() -> {Iterator}`

Return an iterator allows to go through the Body values

`keys() -> {Iterator}`

Return an iterator allows to go through the Body fields path

`interface BodyFile`

This interface reflects internal representation of a File. It is not meant to be constructed manually, but since it's compatible with files from the browsers, you can use these in Body if you need to.

Instance properties

`name`

Contains original name of file taken from the filename property within the form-data.

`type`

File MIME type

`enc`

Contains a value from transfer encoding header

`path`

Path to the file on disk

Instance methods

`stream() -> {Readable}`

Returns a Readable stream allowing to consume file's content

`class BodyField`

BodyField class in the internal representation of a regular FormData value.

`constructor(value: unknown, name: string[, options]) -> {BodyField}`

Creates a new instance of the BodyField class.

Instance properties

`name`

Returns the name of the field.

`fieldnameTruncated`

Indicates whether the fieldname was truncated.

`valueTruncated`

Indicates whether the value was truncated.

`enc`

Returns a value from Content-Transfer-Encoding header.

`type`

Returns a value from Content-Type header.

Instance methods

`valueOf() -> {unknown}`

Returns the value of the BodyField.

`toString() -> {string}`

Returns string representation of the BodyField value.

Fields format

then-busboy can restore an object structure from form-data field names if you will follow the naming formats with dots or square brackets:

Dot notation

This notation looks similarly to JS object properties accessiong syntax:

# Flat objects looks the same in both notations
# Note that the following notation examples is just a pseudo code
name = "John Doe"
age = 25

then-busboy will return the this object for an example from above:

1{
2  name: "John Doe",
3
4  // By default, non-string values will be converted to their initial type.
5  // So, "25" -> 25, "null" -> null, "false" -> false etc.
6  age: 25
7}

For deep objects or collections, use dot or brackets as a separator. But don't mix them.

  rootField.nestedField = "Some text here"

1 {
2  rootField: {
3    nestedField: "Some text here"
4  }
5 }

Bracket notation

rootField[nestedField] = "I beat Twilight Sparkle and all I got was this lousy t-shirt"

Becomes

1{
2  rootField: {
3    nestedField: "I beat Twilight Sparkle and all I got was this lousy t-shirt"
4  }
5}

You can also send an arrays and collections using bracket format:

message[sender] = "John Doe"
message[text] = "Some whatever text message."
message[attachments][0][file] = <here is the file content>
message[attachments][0][description] = "Here is a description of the file"

then-busboy returns the following object:

1{
2  message: {
3    sender: "John Doe",
4    text: "Some whatever text message.",
5    attachments: [
6      {
7        "file": File, // this field will be represended as a File instance
8        "description": "Here is a description of the file"
9      }
10    ]
11  }
12}

Collections allowed too:

[0][firstName] = "John"
[0][lastName] = "Doe"
[0][dob][day] = "1"
[0][dob][month] = "Jan."
[0][dob][year] = "1989"
[0][skills][0] = "Node.js"
[0][skills][1] = "CoffeeScript"
[0][skills][2] = "JavaScript"
[0][skills][3] = "Babel"
[1][firstName] = "Max"
[1][lastName] = "Doe"
[1][dob][day] = "12"
[1][dob][month] = "Mar."
[1][dob][year] = "1992"
[1][skills][0] = "Python"
[1][skills][1] = "Flask"
[1][skills][2] = "JavaScript"
[1][skills][3] = "Babel"
[1][skills][4] = "React"
[1][skills][5] = "Redux"

Then you will receive:

1[
2  {
3    firstName: "John",
4    lastName: "Doe",
5    dob: {
6      day: 1,
7      month: "Jan.",
8      year: 1989
9    },
10    skills: ["Node.js", "CoffeeScript", "JavaScript", "Babel"]
11  }, {
12    firstName: "Max",
13    lastName: "Doe",
14    dob: {
15      day: 12,
16      month: "Mar.",
17      year: 1992
18    },
19    skills: ["Python", "Flask", "JavaScript", "Babel", "React", "Redux"]
20  }
21]

Limits

Whenlimits options are set, then-busboy may reject with HTTP 413 error if specified limit(s) exceeded. That will be a regular error from object http-errors package.

License

MIT

No vulnerabilities found.

10

Dangerous-Workflow

Determines if the project's GitHub Action workflows avoid dangerous patterns.

10

Binary-Artifacts

Determines if the project has generated executable (binary) artifacts in the source repository.

10

License

Determines if the project has defined a license.

0

Maintained

Determines if the project is "actively maintained".

0

Code-Review

Determines if the project requires human code review before pull requests (aka merge requests) are merged.

0

Token-Permissions

Determines if the project's workflows follow the principle of least privilege.

0

Pinned-Dependencies

Determines if the project has declared and pinned the dependencies of its build process.

0

CII-Best-Practices

Determines if the project has an OpenSSF (formerly CII) Best Practices Badge.

0

Security-Policy

Determines if the project has published a security policy.

0

Fuzzing

Determines if the project uses fuzzing.

0

SAST

Determines if the project uses static code analysis.

0

Vulnerabilities

Determines if the project has open, known unfixed vulnerabilities.

Score

2.8

/10

Last Scanned on 2025-04-28

The Open Source Security Foundation is a cross-industry collaboration to improve the security of open source software (OSS). The Scorecard provides security health metrics for open source projects.

Learn More

then-busboy

Installations

Developer Guide

Yes

CommonJS, ESM

>= 12.4

18.7.0

8.15.0

Score

Pull Requests

0

30

10

20

Issues

0

5

5

Releases

Languages

Developer

Download Statistics

GitHub Statistics

Bundle Size

53.46 kB

14.49 kB

Maintainers

Package Meta Information

Total Downloads

65,723

Weekly Downloads

Monthly Downloads

Yearly Downloads

Dependencies

Dev Dependencies

then-busboy

Installation

Usage

API

parse(source[, options]) -> {Promise<Body>}

class Body

constructor(entries) -> {Body}

Static methods

from(entries) -> {Body}

json(value) -> {object}

formData(value) -> {FormData}

Instance properties

length -> {number}

Instance methods

fields() -> {Body}

files() -> {Body}

json() -> {object}

formData() -> {FormData}

entries() -> {Array<[string[], any]>}

values() -> {Iterator}

keys() -> {Iterator}

interface BodyFile

Instance properties

name

type

enc

path

Instance methods

stream() -> {Readable}

class BodyField

constructor(value: unknown, name: string[, options]) -> {BodyField}

Instance properties

name

fieldnameTruncated

valueTruncated

enc

type

Instance methods

valueOf() -> {unknown}

toString() -> {string}

Fields format

Dot notation

Bracket notation

Limits

Related links

`parse(source[, options]) -> {Promise<Body>}`

`class Body`

`constructor(entries) -> {Body}`

`from(entries) -> {Body}`

`json(value) -> {object}`

`formData(value) -> {FormData}`

`length -> {number}`

`fields() -> {Body}`

`files() -> {Body}`

`json() -> {object}`

`formData() -> {FormData}`

`entries() -> {Array<[string[], any]>}`

`values() -> {Iterator}`

`keys() -> {Iterator}`

`interface BodyFile`

`name`

`type`

`enc`

`path`

`stream() -> {Readable}`

`class BodyField`

`constructor(value: unknown, name: string[, options]) -> {BodyField}`

`name`

`fieldnameTruncated`

`valueTruncated`

`enc`

`type`

`valueOf() -> {unknown}`

`toString() -> {string}`