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jsr.io
In short: JSR (jsr.io) accepts javascript or typescript package page. It is free to submit, takes a moderate amount of preparation, and scores 98/100 on our impact ranking (highest impact).
Publish a standards-based your tool JavaScript or TypeScript SDK with generated docs, readme and project links.
Package must be legitimate ESM code and comply with JSR scope, verification and publishing rules.
Priority is do first, which sets the band. It is free and moderate to complete, which adjusts it within that band. The score ranks your queue — it is not a measure of domain authority.