A method and a content validation and coding system (CVCS) for validating and coding content of an electronic document for search engine optimization (SEO) are provided. The CVCS integrates with application programming interfaces (APIs) of search engines and/or media platforms. The CVCS creates a categorized repository of schema codes. The CVCS executes a web crawler for crawling and indexing an electronic document to be coded and content related thereto, from one or more search engines and/or media platforms via the APIs, and identifies structured data and content in the electronic document. The CVCS validates the identified content based on analytic criteria and determines optimal schema codes from the categorized repository and/or dynamically generated supplementary schema codes. The CVCS generates a structured data code map (SDCM) of the optimal schema codes and codes the validated content with the optimal schema codes within the identified structured data using the SDCM for SEO.