n8n-nodes-ajv-json-validator

An n8n community node that validates JSON data against a JSON Schema using AJV, with dual-output routing for valid and invalid items.

n8n is a fair-code licensed workflow automation platform.

Installation | Features | Usage | Compatibility | Resources | Version history

Installation

Follow the installation guide in the n8n community nodes documentation. Search for n8n-nodes-ajv-json-validator in the community nodes panel.

Features

• JSON Schema Draft-07 validation powered by AJV
• Dual outputs — valid items route to the first output, invalid items route to the second
• Format validation — email, date, URI, and more via ajv-formats
• Custom error messages via ajv-errors
• All-errors mode — reports every validation error, not just the first
• Batch processing — validates each input item individually and routes them accordingly
• continueOnFail support — when enabled, unexpected errors send all items to the Invalid output instead of stopping the workflow

Usage

1. Add the JSON Validator node to your workflow.
2. Configure the JSON Schema parameter with a valid JSON Schema (Draft-07).
3. Connect downstream nodes to the two outputs:
   • Output 1 (Valid) — items that pass validation, returned unchanged.
   • Output 2 (Invalid) — items that fail validation. Each item contains:
     • error — the validation error message
     • item — the original input data

If the schema itself is invalid, an error item is sent to the Invalid output.

Compatibility

• n8n >= 1.0
• Node.js >= 20.15

Resources

• n8n community nodes documentation
• JSON Schema specification
• AJV documentation

Version history

• 0.2.3 — Current release. Updated README documentation.
• 0.2.2 — Bumped version.
• 0.2.1 — Renamed package to n8n-nodes-ajv-json-validator. Added test workflow and dev tooling.
• 0.1.0 — Initial release with JSON Schema validation via AJV.