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    <p><strong>Edit</strong> It would be pretty easy if you had ISBN. but converting from UPC to ISBN is not as easy as you'd like.</p> <p>Here's some javascript code for it from <a href="http://isbn.nu" rel="noreferrer">http://isbn.nu</a> where it's done in script</p> <pre><code>if (indexisbn.indexOf("978") == 0) { isbn = isbn.substr(3,9); var xsum = 0; var add = 0; var i = 0; for (i = 0; i &lt; 9; i++) { add = isbn.substr(i,1); xsum += (10 - i) * add; } xsum %= 11; xsum = 11 - xsum; if (xsum == 10) { xsum = "X"; } if (xsum == 11) { xsum = "0"; } isbn += xsum; } </code></pre> <p>However, that only converts from UPC to ISBN <em>some</em> of the time.</p> <p>You may want to look at the <a href="http://www.eblong.com/zarf/bookscan/" rel="noreferrer">barcode scanning project page</a>, too - one person's journey to scan books.</p> <p>So you know about <a href="http://www.amazon.com/AWS-home-page-Money/b?ie=UTF8&amp;node=3435361" rel="noreferrer">Amazon Web Services</a>. But that assumes amazon has the book and has scanned in the UPC.</p> <p>You can also try the <a href="http://www.upcdatabase.com/" rel="noreferrer">UPCdatabase</a> at <a href="http://www.upcdatabase.com/item/" rel="noreferrer">http://www.upcdatabase.com/item/</a>{UPC}, but this is also incomplete - at least it's growing..</p> <p>The library of congress database is also incomplete with UPCs so far (although it's pretty comprehensive), and is harder to get automated.</p> <p>Currently, it seems like you'd have to write this yourself in order to have a high-level lookup that returns simple information (and tries each service)</p>
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    1. POHow can I lookup data about a book from its barcode number?
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    1. USPhilip Rieck
    1. USPhilip Rieck
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    1. COWhat I was hoping for was if someone already had code that did this, so I didn't have to read 8000 pages of AWS documentation. All the little library applications already do it. There's some way to convert UPCs to ISBNs which I don't understand, either.
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      1. USJoel Spolsky
    2. COThat Code is converting isbn13 to ISBN10. It has nothing to do with UPC codes.
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      1. USstevenf
    3. CO@stevenf - incorrect. The UPC on *most* books is the ISBN10 with the number 978 or 979 prepended. in UPC, the first 3 numbers code the country of origin, and 978-979 is assigned to "Bookland". So while it's not really doing anything other than stripping off the country code and checksum (if scanned), it does have something to do with UPC codes.
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