hedera-code-snippets

Short, Self Contained, Correct Examples of code on Hedera.

See: sscce.org

Snippets

• Associate token using JS SDK: associate-token-js-sdk
• Associate token using ethers.js & Metamask: associate-token-via-ethers
• Check if an account is associated to a token using JS SDK: is-associated-js
• Connect to Hedera Testnet via EthersJs: connect-ethersjs
• Connect to Hedera Testnet via Viem: connect-viem
• Convert address from Hedera-native (S.R.N) format to EVM (0x...) format: convert-hedera-native-address-to-evm-address
• Convert public key to account ID (S.R.N format): convert-public-key-to-account-id
• Crypto Intermediary, HBAR Sample Flow: crypto-intermediary
• DApp built with Viem connected to Hedera Testnet: dapp-viem
• Dissociate token using JS SDK: dissociate-token-js-sdk
• Dissociate token using ethers.js & MetaMask: dissociate-via-ethers
• Get Account Info Using Hedera Portal API Keys: get-account-info-using-portal-api-keys
• Obtain "block" number based on timestamp: obtain-block-number-from-timestamp
• Smallest units of HBAR in smart contracts: smallest-hbar-units-smart-contracts
• Random number generation using system contract: prng-system-contract
• Convert USD to HBAR using system contract: convert-usd-hbar-system-contract
• Run Hedera JSON RPC Relay connected to Hedera Testnet: run-hedera-json-rpc-relay-testnet
• Throttling through partial excess gas refunds: excess-gas-partial-refunds
• Create new account on Hedera Testnet using Python: create-new-account-py
• Deploy Smart Contract on Hedera Testnet using Python: deploy-smart-contract-py
• Read Account HBAR balance using Python: get-account-hbar-balance-py
• Store file on Hedera Network using Python: store-file-onchain-py
• Multisig Account: multisig-account
• Multisig Smart Contract Account: multisig-sc-account
• Create, mint, and delete HTS fungible tokens: hts-fungible-token
• BIP39 Create Accounts: bip39-create-accounts
• HCS Topic Permissioned Write: hcs-topic-permissioned-write
• HTS Fungible Token Creation & Update with Metadata, inc. IPFS upload script hts-fungible-token-metadata
• Unlimited Max Automatic Token Associations: unlimited-max-auto-associations-js-sdk

Contributing

What to contribute

• Something that you think will be useful to developers working on Hedera technology.
• Something can be reduced to a short, self-contained, correct example. See sscce.org.
  • If your code example cannot be turned into an SSCCE, e.g. it is too complex, consider contributing a full repo on its own instead.
• Something that you think is worth explaining. For example:
  • Solutions/ workarounds for commonly encountered issues.
  • Demonstrate nuances/ differences between Hedera and other DLTs.
  • Doing something tricky.

How to contribute

Submit a pull request with a new directory containing your code snippet, plus a README file that explains it.

Suggested steps:

• Fork this repo into your github account.
• Clone your forked repo.
• Create a new branch with the name of your code snippet as the branch name.
• Create a new directory in the root directory of this repo with the name of your code snippet.
• Copy the template README file from templates/README.md into your new code snippet directory.
• Add one (or more) code files for your code snippet.
• Edit the README file to replace the placeholders - use existing code snippets' README files as a reference.
• Edit the main README file for this repo to add a link to your code snippet under ## Snippets.
• Save your changes.
• Push the changes to the git remote corresponding to your forked repo.
• Submit a pull request from your branch in the forked repo against the main branch in this repo.

Example commands:

If you're using the git command line tool, here's a set of example commands, where bguiz is your github username and hello-world is the name of your code snippet.

# fork the repo
# visit https://github.com/hedera-dev/hedera-code-snippets ; and press the "fork" button

# git clone the repo specifying your username as the remote to get your forked repo
git clone --origin bguiz [email protected]:bguiz/hedera-code-snippets.git

# create a new branch
cd hedera-code-snippets
git checkout -b feat/hello-world

# create a new directory
mkdir ./hello-world

# copy the README file template
cp ./templates/README.md ./hello-world/

# create code files related to your code snippet
touch ./hello-world/hello-world.js

# edit the README file to fill in the placeholders
touch ./hello-world/README.md

# edit the main README for the repo to link to your code snippet
touch ./README.md

# save changes
git add ./hello-world/hello-world.js ./hello-world/README.md
git commit -s "feat: add hello world code snippet"

# git push your branch specifying your username as the remote to update your forked repo
git push bguiz feat/hello-world

# submit a pull request
# visit https://github.com/hedera-dev/hedera-code-snippets ; and press the "compare & pull request" button