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The Json ABI File

Icon LinkThe JSON ABI file

Whether you want to deploy or connect to a pre-existing smart contract, the JSON ABI file is extremely important: it's what tells the SDK about the ABI methods Icon Link in your smart contracts.

For the same example Sway code as above:


abi MyContract {
    fn test_function() -> bool;

impl MyContract for Contract {
    fn test_function() -> bool {

The JSON ABI file looks like this:

$ cat out/debug/my-test-abi.json
    "type": "function",
    "inputs": [],
    "name": "test_function",
    "outputs": [
        "name": "",
        "type": "bool",
        "components": null

The Fuel Rust SDK will take this file as input and generate equivalent methods (and custom types if applicable) that you can call from your Rust code.