Handling Nested JSON Structures in Solidity Smart Contracts for API Integration
I'm getting frustrated with I'm maintaining legacy code that I've encountered a strange issue with This might be a silly question, but Currently developing a smart contract that needs to interact with an external API, which returns complex nested JSON structures... This integration is crucial for updating user balances based on off-chain data. The API response looks something like this: ```json { "user": { "id": "12345", "balance": { "current": "100.00", "pending": "25.00" } } } ``` To handle this, I need to extract the `current` value from the `balance` object within the user data. However, Solidity's lack of built-in JSON parsing capabilities complicates things. I've been exploring libraries like `solidity-json-parser`, but I keep running into issues during deployment. For context, here's a snippet of what I’ve implemented so far: ```solidity pragma solidity ^0.8.0; import "https://github.com/YourRepo/solidity-json-parser.sol"; contract BalanceUpdater { using JsonParser for string; function updateBalance(string memory jsonResponse) public returns (uint) { string memory userId = jsonResponse.parseJson("user.id"); string memory currentBalance = jsonResponse.parseJson("user.balance.current"); // Further logic to update the state... } } ``` While this approach seems promising, I'm stuck on how to effectively handle the response when the API occasionally returns missing fields or malformed data. I've added checks for the validity of `jsonResponse`, but the Solidity environment throws runtime errors when trying to parse missing keys. What strategies have you employed to gracefully handle these scenarios and ensure that your smart contract can rely on the external API without crashing? Any insights on more robust JSON handling mechanisms within Solidity would be appreciated. I'm working on a API that needs to handle this. Thanks in advance! For reference, this is a production service. Thanks for any help you can provide! Any pointers in the right direction? I'd really appreciate any guidance on this.