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An indexer built with the Squid SDK (a squid) is an ordinary Node.js project. Building one from scratch means initializing an npm package, installing the SDK packages you need — a Fuel data source for retrieving and filtering the raw data, a data store for saving the processed records, and optionally the GraphQL server — then wiring them together in a short main.ts. See the packages overview for the full list of building blocks. For a complete walkthrough of developing a Fuel squid, follow the dedicated tutorial:

Indexing Fuel receipts

Build a Fuel indexer that tracks contract receipts step by step.