# cre/getting-started/part-4-writing-onchain
Source: https://docs.chain.link/cre/getting-started/part-4-writing-onchain

> For the complete documentation index, see [llms.txt](/llms.txt).

- Go: /cre/getting-started/part-4-writing-onchain-go.md
- TypeScript: /cre/getting-started/part-4-writing-onchain-ts.md