JSON Schema Validator

Validates JSON values based on the specified schema v3 or v4.

When a value does not satisfy the constraints of the schema, the node fails with an error message and the row number or collects the errors in a new column.

It uses the fge/json-schema-validator implementation.

Options

JSON column: The JSON column to validate.
Schema: The JSON schema used for validation.
Fail on invalid JSON value: If checked, execution will stop on first value that violates the specified schema.
Error message column: Name of the column for the collected error messages (when there were no errors, a missing value is returned).

Input Ports

: A table with JSON column to validate.

Output Ports

: The table with the error messages column.

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Installation

To use this node in KNIME, install the extension KNIME JSON-Processing from the below update site following our NodePit Product and Node Installation Guide:

v5.12

A zipped version of the software site can be downloaded here.

Plugin provider: KNIME AG, Zurich, Switzerland

Plugin version: 5.12.0.v202605291551

On NodePit since: 2026-08-08

Last update: 2026-08-13

Tags: Modern UI

KNIME versions: Since v3.6

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