Function validate_json_depth 

pub fn validate_json_depth(
    json_str: &str,
    max_depth: usize,
) -> Result<(), String>

Validate JSON nesting depth to prevent DoS attacks

Arguments

• json_str - The JSON string to validate
• max_depth - Maximum allowed nesting depth (use MAX_JSON_DEPTH for default)

Returns

• Ok(()) if the JSON is valid and within depth limits
• Err(String) with error message if validation fails

Examples

use veracode_platform::json_validator::{validate_json_depth, MAX_JSON_DEPTH};

// Valid JSON within depth limit
let json = r#"{"user": {"profile": {"settings": {"theme": "dark"}}}}"#;
assert!(validate_json_depth(json, MAX_JSON_DEPTH).is_ok());

// Deeply nested JSON should be rejected
let deep_json = (0..50).fold(String::from("{\"a\":"), |acc, _| acc + "{\"a\":")
    + &(0..50).map(|_| "}").collect::<String>();
assert!(validate_json_depth(&deep_json, MAX_JSON_DEPTH).is_err());

Security

This function protects against:

• Stack overflow from recursive parsing
• CPU exhaustion from excessive nesting
• Memory exhaustion from deeply nested structures

Errors

Returns an error if the JSON is invalid or exceeds the maximum nesting depth.