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+---
+title: "How to read a file"
+layout: default
+section: example
+---
+
+This page explains how to read an existing zip file or add a existing file into
+the zip file.
+
+
+### In the browser
+
+#### AJAX request
+
+Getting binary data with an ajax request is hard (mainly because of IE <= 9).
+The easy way is to use [JSZipUtils.getBinaryContent](https://github.com/stuk/jszip-utils).
+With JSZipUtils.getBinaryContent, you can do the following (see the
+documentation for more examples) :
+
+```js
+JSZipUtils.getBinaryContent('path/to/content.zip', function(err, data) {
+ if(err) {
+ throw err; // or handle err
+ }
+
+ var zip = new JSZip(data);
+});
+```
+
+
+
+If you need to adapt an existing solution to what getBinaryContent does, here
+are the details. When doing a XHR request (level 1, without setting the
+`responseType`) the browser will try to interpret the response as a string and
+decode it from its charset. To avoid this on Firefox/Chrome/Opera, you need to
+set mime type : `xhr.overrideMimeType("text/plain; charset=x-user-defined");`.
+On IE <= 9, this is harder. The overrideMimeType trick doesn't work so we need
+to use [vbscript](http://stackoverflow.com/questions/1095102/how-do-i-load-binary-image-data-using-javascript-and-xmlhttprequest)
+and non standard attributes.
+On IE > 9, overrideMimeType doesn't work but xhr2 does.
+
+With [xhr 2](http://caniuse.com/xhr2), you can just set the responseType
+attribute : `xhr.responseType = "arraybuffer";`. With this, the browser will
+return an ArrayBuffer.
+
+#### Local files
+
+If the browser supports the [FileReader API](http://caniuse.com/filereader),
+you can use it to read a zip file. JSZip can read ArrayBuffer, so you can use
+`FileReader.readAsArrayBuffer(Blob)`, see this [example]({{site.baseurl}}/documentation/examples/read-local-file-api.html).
+
+### In nodejs
+
+JSZip can read Buffers so you can do the following :
+
+#### Local file
+
+```js
+"use strict";
+
+var fs = require("fs");
+var JSZip = require("jszip");
+
+// read a zip file
+fs.readFile("test.zip", function(err, data) {
+ if (err) throw err;
+ var zip = new JSZip(data);
+});
+
+// read a file and add it to a zip
+fs.readFile("picture.png", function(err, data) {
+ if (err) throw err;
+ var zip = new JSZip();
+ zip.file("picture.png", data);
+});
+```
+
+#### Remote file
+
+There are a lot of nodejs libraries doing http requests, from the built-in
+[http](http://nodejs.org/docs/latest/api/http.html) to the
+[npm packages](https://www.npmjs.org/browse/keyword/http). Here are two
+examples, one with the default http API, the other with
+[request](https://github.com/mikeal/request) (but you're free to use your
+favorite library !). If possible, download the file as a Buffer (you will get
+better performances). If it's not possible, you can fallback to a binary string
+(the option is likely to be `encoding : "binary"`).
+
+##### With http :
+
+```js
+"use strict";
+
+var http = require("http");
+var url = require("url");
+var JSZip = require("jszip");
+
+var req = http.get(url.parse("http://localhost/.../file.zip"), function (res) {
+ if (res.statusCode !== 200) {
+ console.log(res.statusCode);
+ // handle error
+ return;
+ }
+ var data = [], dataLen = 0;
+
+ // don't set the encoding, it will break everything !
+ // or, if you must, set it to null. In that case the chunk will be a string.
+
+ res.on("data", function (chunk) {
+ data.push(chunk);
+ dataLen += chunk.length;
+ });
+
+ res.on("end", function () {
+ var buf = new Buffer(dataLen);
+ for (var i=0,len=data.length,pos=0; i