I am looking for searching products based on product information like title, description from all categories.
But I can't find any search API for products in API section. Have I missed it somewhere or any info regarding this is appreciated.
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This is an accepted solution.
Take a peek at the below
You can query the title in your query parameter. Shopify even have a GQL demo environment at the bottom of the page to test your queries.
REST only supports full title matching so you can't search for part of a title. But you can use the GET to query this info.