json-validator

name	json-validator
description	WASM skill providing JSON validation and manipulation for VAK agents.

JSON Validator Skill

A WebAssembly module providing JSON validation and manipulation operations that runs inside the VAK kernel sandbox.

Overview

This skill provides JSON operations for:

• JSON validation (syntax checking)
• Pretty printing (formatting)
• Minification (compression)
• Value extraction (JSONPath-like)
• Object merging
• Diff generation

Building

# Build for WASM target
cargo build -p json-validator --target wasm32-unknown-unknown --release

# Output location
# target/wasm32-unknown-unknown/release/json_validator.wasm

Operations

Operation	Input	Output	Description
validate	string	bool	Check if valid JSON
pretty	json	string	Format with indentation
minify	json	string	Remove whitespace
extract	(json, path)	value	Extract value at path
merge	(json1, json2)	json	Deep merge objects
diff	(json1, json2)	changes	Generate diff

Safety

This skill runs in the VAK WASM sandbox with:

• Epoch preemption: Automatic timeout for deeply nested JSON
• Memory limits: Protection against memory bomb attacks
• Input validation: Malformed JSON rejected early

Usage Example

// From VAK kernel
let is_valid = kernel.execute_skill("json-validator", "validate", &json_string).await?;

let pretty = kernel.execute_skill("json-validator", "pretty", &json_string).await?;

Use Cases

• Validating LLM output before parsing
• Formatting JSON for logging
• Extracting specific fields from API responses
• Comparing state snapshots

Files

• Cargo.toml - Crate configuration
• src/lib.rs - Skill implementation