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fetch-base64
Advanced tools
A node package to retrieve fetch local or remote images in base64 encoding.
A node package to retrieve fetch local or remote files in base64 encoding. Useful for embedding assets (images, web fonts, etc.) into HTML or CSS documents.
Disclaimer: I've only used this for images so far, but there is no reason why it shouldn't work for any other kind of files.
If you find a bug please report it here.
const fetch = require(fetch-base64);
fetch.local('/path/to/image.jpg').then((data) => {
// data[0] contains the raw base64-encoded jpg
}).catch((reason) => {});
fetch.remote('http://domain.com/to/image.jpg').then((data) => {
// data[1] contains base64-encoded jpg with MimeType
}).catch((reason) => {});
fecth.auto('/remote/or/local/path/image.gif').then((data) => {
}).catch((reason) => {});
npm install --save fetch-base64
All the functions return a Promise
which when resolved will return an Array with two Strings (data
):
data[0]
will contain the raw base64-encoded file. E.g.: iVBORw0KGgoAAAANSUhEUg...
data[1]
will contain the same information as data[0]
and the mimeType. Useful if you want to embed the file into an HTMl or CSS document. E.g.: data:image/png;base64,iVBORw0KGgoAAAANSUhEUg...
fetch.local(...paths)
Fetch local files and return a promise with the file in base64 format.
...paths
<string(s)>
: Single or multiple paths which will be combined using node's path.resolve()
. You can pass multiple paths to resolve a relative path to an absolute path. Some examples of valid values for this parameter:
'/some/absolute/path/image.jpg'
'/base/path/to/html', './img/animation.gif'
fetch.remote(url)
Fetch remote file in url
and return a promise with the file in base64 format.
User Agent is spoofed to be same as Chrome's to avoid some restrictions, but fetching could still fail for other reasons.
url
<string>
: URL where the file resides. Note that node must have access to the given URL.fetch.remote(from, to)
Resolve url using node's url.resolve(from, to)
, fetch remote file and return a promise with the file in base64 format.
User Agent is spoofed to be same as Chrome's to avoid some restrictions, but fetching could still fail for other reasons.
from
<string>
: The Base URL being resolved against.to
<string>
: The HREF URL being resolved.See url.resolve()
for more information and examples.
fetch.auto(...mixed)
This function will do the best effort to automatically detect the kind of path passed (remote
or local
) and invoke the correspondent function.
It will use the fetch.isRemote()
function to determine if a remote url or a local path has been passed in the first parameter.
...mixed
<string(s)>
: Accepts the same parameters as fetch.local(...paths)
, fetch.remote(url)
or fetch.remote(from, to)
- see above. Examples of valid calls:
fetch.auto('/base/path/to/html', './img/animation.gif');
fetch.auto('http://some.domain/file.png');
fetch.auto('http://some.domain/', 'file.png');
fetch.isLocal(path)
Returns true
if the passed path (<string>
) is local. Returns false
otherwise.
fetch.isRemote(path)
Returns true
if the passed path (<string>
) is remote. Returns false
otherwise.
const fetch = require('fetch-base64');
// will fetch image in /Users/bla/src/project/img/logo.jpg
const doFetchLocal = fetch.local('/Users/bla/src/project', './img/logo.jpg');
doFetchLocal.then((data) => {
console.log(`base64 image raw: ${data[0]}`);
}, (reason) => {
console.log(`Fetch Failed: ${reason}`)
});
const doFetchRemote = fetch.remote('https://somedomain.com/image.jpg');
doFetchRemote.then((data) => {
console.log(`base64 image with mimeType: ${data[1]}`);
}, (reason) => {
console.log(`Fetch Failed: ${reason}`)
});
const doFetchRemote2 = fetch.remote('https://somedomain.com', '/image.jpg');
doFetchRemote.then((data) => {
console.log(`base64 image with mimeType: ${data[1]}`);
}, (reason) => {
console.log(`Fetch Failed: ${reason}`)
});
const doFetchAuto = fetch.auto('https://somedomain.com/image.jpg');
doFetch.then((data) => {
console.log(`base64 image: ${data[0]}`);
}, (reason) => {
console.log(`Fetch Failed: ${reason}`)
});
const doFetchAuto2 = fetch.auto('/some/local/', '/path/', './image.jpg');
doFetch.then((data) => {
console.log(`base64 image: ${data[0]}`);
}, (reason) => {
console.log(`Fetch Failed: ${reason}`)
});
FAQs
A node package to retrieve fetch local or remote files in base64 encoding.
The npm package fetch-base64 receives a total of 6,417 weekly downloads. As such, fetch-base64 popularity was classified as popular.
We found that fetch-base64 demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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