NetSuite Development Resources

SuiteTalk Documentation Index – contains a link to the wsdl, schema browser, and platform guide, and records guide
WSDL v2013_1_0 – I would recommend downloading the WSDL zip and pulling it up in Sublime Text. It's a great reference when trying to figure out how to structure XML.
WSDL v2015_2_0
WSDL v2016_2_0
Schema Browser 2013
Schema Browser 2014
Schema Browser 2016
SuiteTalk Documentation - Broken link
SuiteTalk Record Documentation – XSDs can be found by going to the SuiteTalk Records documentation and navigating to documentation on a particular record. There is a link on the top of the documentation for record linking to the XSD.
SuiteTalk Platform Information
Official User Group
Summary of the Javascript API
NetSuite System Status – takes a while for updates to be posted.
Release Notes
- 2013
- Merge Diff – useful information about what has changed in the WSDL.

NoobSnippet Blog - Examples of Get, Search, Add requests using the Gem in a Rails project.
Another JS API Reference
Explore Consulting – misc tips & tricks
DreamXTeam – another tips & tricks blog
Me.Thoughts.ToString() – older blog with lots of helpful tips - link broken
Fourth Wave Consulting - NetSuite & SEO blog with detailed articles & technical walkthroughs
PHP API Wrapper - A sane API Wrapper using composer autoloading and namespaces.

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