How do I check for FormData object using Modernizr and YepNope ? <script> yepnope({

Question

Asked: June 3, 20262026-06-03T04:49:02+00:00 2026-06-03T04:49:02+00:00

How do I check for FormData object using Modernizr and YepNope?

<script>
yepnope({  
  test : what.to.check,  
  yep  : 'normal.js',  
  nope : 'flashupload.js'  
});      
</script>

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Editorial Team · Answer 1 · 2026-06-03T04:49:04+00:00

I was looking for a Modernizer way to check FormData the other day and couldn’t find one.

However, it’s easy to do without Modernizer:

window.FormData // exists if it exists, undefined if it doesn't!

So:

yepnope({  
  test : "FormData" in window,
  yep  : 'normal.js',  
  nope : 'flashupload.js'  
});

FWIW, MDC compatability for FormData says you’ll be targeting:

… Opera support is unknown

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