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87 lines
2.7 KiB
87 lines
2.7 KiB
# @fastify/formbody
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[](https://www.npmjs.com/package/@fastify/formbody)
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[](https://www.npmjs.com/package/@fastify/formbody)
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[](https://standardjs.com)
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A simple plugin for [Fastify][fastify] that adds a content type parser for
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the content type `application/x-www-form-urlencoded`.
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[fastify]: https://www.fastify.io/
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This branch targets Fastify v4. Please refer to [this branch](https://github.com/fastify/fastify-formbody/tree/3.x) and related versions for Fastify `^2.0.0` compatibility.
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For Fastify v3 support, please use @fastify/formbody `^6.0.1`.
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## Example
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Given the following code:
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```js
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const fastify = require('fastify')()
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fastify.register(require('@fastify/formbody'))
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fastify.post('/', (req, reply) => {
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reply.send(req.body)
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})
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fastify.listen({ port: 8000 }, (err) => {
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if (err) throw err
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})
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```
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And a `POST` body of:
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```html
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foo=foo&bar=bar&answer=42
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```
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The sent reply would be the object:
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```js
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{
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foo: 'foo',
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bar: 'bar',
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answer: 42
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}
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```
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## Options
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The plugin accepts an options object with the following properties:
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+ `bodyLimit`: The maximum amount of bytes to process
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before returning an error. If the limit is exceeded, a `500` error will be
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returned immediately. When set to `undefined` the limit will be set to whatever
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is configured on the parent Fastify instance. The default value is
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whatever is configured in
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[fastify](https://github.com/fastify/fastify/blob/main/docs/Reference/Server.md#bodylimit)
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(`1048576` by default).
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+ `parser`: The default parser used is the querystring.parse built-in. You can change this default by passing a parser function e.g. `fastify.register(require('@fastify/formbody'), { parser: str => myParser(str) })`
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## Upgrading from 4.x
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Previously, the external [qs lib](https://github.com/ljharb/qs) was used that did things like parse nested objects. For example:
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- ***Input:*** `foo[one]=foo&foo[two]=bar`
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- ***Parsed:*** `{ foo: { one: 'foo', two: 'bar' } }`
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The way this is handled now using the built-in querystring.parse:
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- ***Input:*** `foo[one]=foo&foo[two]=bar`
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- ***Parsed:*** `{ 'foo[one]': 'foo', 'foo[two]': 'bar' }`
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If you need nested parsing, you must configure it manually by installing the qs lib (`npm i qs`), and then configure an optional parser:
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```js
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const fastify = require('fastify')()
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const qs = require('qs')
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fastify.register(require('@fastify/formbody'), { parser: str => qs.parse(str) })
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```
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## License
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Licensed under [MIT](./LICENSE)
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