Compress content when serving pages by node.js server

Question

I need to implement compression to reduce the size of files fetched by browser. I have pages on the node.js server that read from public folder (JSON and CSV files).

When I visit the pages and analyze them using PageSpeed it suggests :

Compressing the following resources with gzip could reduce their transfer size by ...

... localhost:3000/data/xyz.csv could save 1.1MiB (83% reduction).

How do i serve compressed files to the client. Do I have to compress them beforehand and add it to compressed folder. I make some CSV files on the fly so can i do this in run time.

How do i intercept request for a file and send its compressed content (only xyz.CSV not others).

GET /data/xyz.csv 200 561ms

if i want to compress not all but only select few files say only those in a folder.

You can use gzip compression. this might help you: stackoverflow.com/questions/3894794/node-js-gzip-compression — Emil Condrea
– Emil Condrea, Commented Dec 26, 2012 at 13:15
Thanks, the zlib module should do for on the fly compressing. But how do you serve the already compressed files. I have compressed xyz.csv to xyz.csv.zip myself, how do I serve it. Would I have to decompress it on client end or browser understands the compression and gives me the uncompressed file. — user568109
– user568109, Commented Dec 27, 2012 at 5:47
if browser accepts compression it uncompress it automatically — Emil Condrea
– Emil Condrea, Commented Dec 27, 2012 at 8:30

user568109 · Accepted Answer · 2013-02-06 06:18:01Z

After a lot of searching I found the easiest option to use the express-zip module

https://npmjs.org/package/express-zip

It does not require any change on developer part (compress/decompress files). Just serve files like you do in express (which is what I use)

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