> ## Documentation Index
> Fetch the complete documentation index at: https://mintlify.com/provablehq/leo/llms.txt
> Use this file to discover all available pages before exploring further.

# leo abi

> Generate ABI from an Aleo bytecode file

Generate ABI (Application Binary Interface) from an Aleo bytecode file. This command reads a `.aleo` file and produces a JSON representation of the program's interface.

## Usage

```bash theme={null}
leo abi <FILE> [OPTIONS]
```

## Arguments

<ParamField path="FILE" type="string" required>
  Path to the `.aleo` bytecode file
</ParamField>

## Options

<ParamField path="--network" type="string" default="testnet">
  Network for parsing. Valid values:

  * `mainnet` - Mainnet network
  * `testnet` - Testnet network (default)
  * `canary` - Canary network
</ParamField>

<ParamField path="--output" type="string">
  Output file path. If not specified, prints to stdout.
</ParamField>

## Examples

### Generate ABI to stdout

```bash theme={null}
leo abi program.aleo
```

### Generate ABI to file

```bash theme={null}
leo abi program.aleo --output program_abi.json
```

### Generate ABI for mainnet

```bash theme={null}
leo abi program.aleo --network mainnet --output program_abi.json
```

## Output Format

The generated ABI is a JSON file describing the program's interface:

```json theme={null}
{
  "program": "program_name.aleo",
  "functions": [
    {
      "name": "function_name",
      "inputs": [...],
      "outputs": [...]
    }
  ],
  "structs": [...],
  "records": [...],
  "mappings": [...]
}
```

## Use Cases

* **Documentation** - Generate API documentation for your program
* **Integration** - Provide ABI to frontend applications for integration
* **Tooling** - Build tools that interact with Leo programs
* **Analysis** - Analyze program interfaces and dependencies

## Related Commands

* [Build](/cli/build) - Compile Leo programs to bytecode
* [Deploy](/cli/deploy) - Deploy programs to network

## Troubleshooting

### File not found

Ensure the `.aleo` file path is correct and the file exists:

```bash theme={null}
ls -la program.aleo
```

### Invalid .aleo file

The file must be valid Aleo bytecode. If you have a Leo source file, compile it first:

```bash theme={null}
leo build
leo abi build/main.aleo
```