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ajv-errors

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ajv-errors

Custom error messages in JSON Schemas for Ajv validator

  • 3.0.0
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What is ajv-errors?

The ajv-errors package allows you to customize error messages in JSON Schema validation using the Ajv validator. It provides a way to enhance the default error messages that Ajv produces, making them more informative and user-friendly. This can be particularly useful in applications where precise and clear validation errors are necessary, such as form validation in web applications.

What are ajv-errors's main functionalities?

Custom error messages for specific validation keywords

This feature allows you to specify custom error messages for specific validation keywords, such as 'required', 'type', etc. In the provided code sample, a custom error message is defined for when the 'name' field is missing.

{ "type": "object", "properties": { "name": { "type": "string" } }, "required": ["name"], "errorMessage": { "required": { "name": "Name is required." } } }

Conditional error messages

This feature enables conditional error messages based on the validation outcome. In the example, a custom error message is set for the 'passwordConfirm' field to ensure it matches the 'password' field.

{ "type": "object", "properties": { "password": { "type": "string" }, "passwordConfirm": { "type": "string", "const": { "$data": "1/password" } } }, "errorMessage": { "properties": { "passwordConfirm": "Passwords must match." } } }

Top-level error messages

Allows setting a top-level error message for the entire schema. This is useful for providing a general error message instead of or in addition to specific field errors. The example sets a general error message regarding the 'age' field.

{ "type": "object", "properties": { "age": { "type": "number" } }, "required": ["age"], "errorMessage": "An age is required and must be a number." }

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Package last updated on 27 Mar 2021

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