Content disposition filename javascript

content-disposition

Create an attachment Content-Disposition header value using the given file name, if supplied. The filename is optional and if no file name is desired, but you want to specify options , set filename to undefined .

res.setHeader('Content-Disposition', contentDisposition('∫ maths.pdf'))

note HTTP headers are of the ISO-8859-1 character set. If you are writing this header through a means different from setHeader in Node.js, you’ll want to specify the ‘binary’ encoding in Node.js.

Options

contentDisposition accepts these properties in the options object.

fallback

If the filename option is outside ISO-8859-1, then the file name is actually stored in a supplemental field for clients that support Unicode file names and a ISO-8859-1 version of the file name is automatically generated.

This specifies the ISO-8859-1 file name to override the automatic generation or disables the generation all together, defaults to true .

• A string will specify the ISO-8859-1 file name to use in place of automatic generation.
• false will disable including a ISO-8859-1 file name and only include the Unicode version (unless the file name is already ISO-8859-1).
• true will enable automatic generation if the file name is outside ISO-8859-1.

If the filename option is ISO-8859-1 and this option is specified and has a different value, then the filename option is encoded in the extended field and this set as the fallback field, even though they are both ISO-8859-1.

type

Specifies the disposition type, defaults to «attachment» . This can also be «inline» , or any other value (all values except inline are treated like attachment , but can convey additional information if both parties agree to it). The type is normalized to lower-case.

contentDisposition.parse(string)

var disposition = contentDisposition.parse('attachment; filename="EURO rates.txt"; filename*=UTF-8\'\'%e2%82%ac%20rates.txt')

Parse a Content-Disposition header string. This automatically handles extended («Unicode») parameters by decoding them and providing them under the standard parameter name. This will return an object with the following properties (examples are shown for the string ‘attachment; filename=»EURO rates.txt»; filename*=UTF-8\’\’%e2%82%ac%20rates.txt’ ):

• type : The disposition type (always lower case). Example: ‘attachment’
• parameters : An object of the parameters in the disposition (name of parameter always lower case and extended versions replace non-extended versions). Example:

Examples

Send a file for download

var contentDisposition = require('content-disposition') var destroy = require('destroy') var fs = require('fs') var http = require('http') var onFinished = require('on-finished') var filePath = '/path/to/public/plans.pdf' http.createServer(function onRequest (req, res)  // set headers res.setHeader('Content-Type', 'application/pdf') res.setHeader('Content-Disposition', contentDisposition(filePath)) // send file var stream = fs.createReadStream(filePath) stream.pipe(res) onFinished(res, function ()  destroy(stream) >) >)

Testing

References

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How to get file name from content-disposition in Javascript?

When working with HTTP responses, it is common to receive a «Content-Disposition» header, which specifies information about how the content of a response should be handled by the browser. In some cases, you may need to extract the file name from this header in order to save the content of the response as a file on the client’s computer. In this article, we will discuss different methods to extract the file name from the «Content-Disposition» header in JavaScript.

Method 1: Using split and indexOf

To get the file name from the Content-Disposition header in JavaScript using split and indexOf , follow these steps:

const contentDisposition = response.headers.get('Content-Disposition');

const filenameIndex = contentDisposition.indexOf('filename=');

const filename = contentDisposition.substring(filenameIndex + 9).split(';')[0];

• indexOf method returns the index of the first occurrence of the specified value in a string. In this case, it returns the index of the filename parameter in the Content-Disposition header value.
• substring method returns the part of the string between the start and end indexes. In this case, it returns the substring after the filename= parameter.
• split method splits a string into an array of substrings based on a specified separator. In this case, it splits the substring by the ; separator and returns the first element of the resulting array, which is the file name.

Here’s the complete code example:

const contentDisposition = 'attachment; filename="example.pdf"; size=12345'; const filenameIndex = contentDisposition.indexOf('filename='); const filename = contentDisposition.substring(filenameIndex + 9).split(';')[0]; console.log(filename); // Output: example.pdf

Note: Replace the contentDisposition variable with the actual Content-Disposition header value in your application.

Method 2: Using Regular Expressions

To extract the file name from the content-disposition header using regular expressions in JavaScript, you can follow these steps:

const contentDisposition = response.headers.get('content-disposition');

const fileNameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/; const match = fileNameRegex.exec(contentDisposition); const fileName = match[1].replace(/['"]/g, '');

This regular expression matches the string «filename» followed by optional whitespace and an equals sign, then captures the file name in either single or double quotes or without quotes. The captured file name is then extracted from the match and any surrounding quotes are removed.

Here is the complete code example:

const contentDisposition = response.headers.get('content-disposition'); const fileNameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/; const match = fileNameRegex.exec(contentDisposition); const fileName = match[1].replace(/['"]/g, '');

Note that this method assumes that the content-disposition header is present and contains a file name. It may not work for all cases and you may need to adjust the regular expression accordingly.

Method 3: Using URL encoding

To get the file name from the content-disposition header using URL encoding in JavaScript, you can use the following steps:

1. Get the content-disposition header value from the response headers.
2. Extract the file name from the content-disposition header using a regular expression.
3. Decode the URL-encoded file name using the decodeURIComponent() function.

Here is an example code snippet that demonstrates these steps:

// Step 1: Get the content-disposition header value const contentDisposition = response.headers.get('content-disposition'); // Step 2: Extract the file name using a regular expression const fileNameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/; const matches = fileNameRegex.exec(contentDisposition); const fileName = matches[1].replace(/['"]/g, ''); // Step 3: Decode the URL-encoded file name const decodedFileName = decodeURIComponent(fileName);

In this example, we first get the content-disposition header value from the response headers. Then, we use a regular expression to extract the file name from the content-disposition header. Finally, we decode the URL-encoded file name using the decodeURIComponent() function.

Note that the regular expression used in this example may not work for all content-disposition header values. You may need to modify the regular expression to match the specific format of your content-disposition header.

Also, keep in mind that URL encoding is not always used in content-disposition headers. Some servers may use other encoding schemes, such as MIME encoding, to encode file names in the content-disposition header. In those cases, you will need to use a different method to extract the file name.

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Create and parse HTTP Content-Disposition header

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README.md

Create and parse HTTP Content-Disposition header

$ npm install content-disposition

var contentDisposition = require('content-disposition')

Create an attachment Content-Disposition header value using the given file name, if supplied. The filename is optional and if no file name is desired, but you want to specify options , set filename to undefined .

res.setHeader('Content-Disposition', contentDisposition('∫ maths.pdf'))

note HTTP headers are of the ISO-8859-1 character set. If you are writing this header through a means different from setHeader in Node.js, you’ll want to specify the ‘binary’ encoding in Node.js.

contentDisposition accepts these properties in the options object.

If the filename option is outside ISO-8859-1, then the file name is actually stored in a supplemental field for clients that support Unicode file names and a ISO-8859-1 version of the file name is automatically generated.

This specifies the ISO-8859-1 file name to override the automatic generation or disables the generation all together, defaults to true .

• A string will specify the ISO-8859-1 file name to use in place of automatic generation.
• false will disable including a ISO-8859-1 file name and only include the Unicode version (unless the file name is already ISO-8859-1).
• true will enable automatic generation if the file name is outside ISO-8859-1.

If the filename option is ISO-8859-1 and this option is specified and has a different value, then the filename option is encoded in the extended field and this set as the fallback field, even though they are both ISO-8859-1.

Specifies the disposition type, defaults to «attachment» . This can also be «inline» , or any other value (all values except inline are treated like attachment , but can convey additional information if both parties agree to it). The type is normalized to lower-case.

var disposition = contentDisposition.parse('attachment; filename="EURO rates.txt"; filename*=UTF-8\'\'%e2%82%ac%20rates.txt')

Parse a Content-Disposition header string. This automatically handles extended («Unicode») parameters by decoding them and providing them under the standard parameter name. This will return an object with the following properties (examples are shown for the string ‘attachment; filename=»EURO rates.txt»; filename*=UTF-8\’\’%e2%82%ac%20rates.txt’ ):

• type : The disposition type (always lower case). Example: ‘attachment’
• parameters : An object of the parameters in the disposition (name of parameter always lower case and extended versions replace non-extended versions). Example:

var contentDisposition = require('content-disposition') var destroy = require('destroy') var fs = require('fs') var http = require('http') var onFinished = require('on-finished') var filePath = '/path/to/public/plans.pdf' http.createServer(function onRequest (req, res)  // set headers res.setHeader('Content-Type', 'application/pdf') res.setHeader('Content-Disposition', contentDisposition(filePath)) // send file var stream = fs.createReadStream(filePath) stream.pipe(res) onFinished(res, function ()  destroy(stream) >) >)

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