ajv vs json-parse-helpfulerror vs json-schema vs jsonlint vs jsonlint-mod

Package	Downloads	Stars	Size	Issues	Publish	License
Package	Downloads	Stars	Size	Issues	Publish	License
ajv	0	14,636	1.03 MB	318	21 days ago	MIT
json-parse-helpfulerror	0	19	-	1	11 years ago	MIT
json-schema	0	528	-	30	4 years ago	(AFL-2.1 OR BSD-3-Clause)
jsonlint	0	1,987	-	80	8 years ago	-
jsonlint-mod	0	31	-	0	5 years ago	-

Validation Performance

ajv:
ajv (Another JSON Validator) is known for its high performance and low memory usage, especially when validating large datasets against JSON Schemas. It compiles schemas into efficient validation functions, making it one of the fastest validators available.
json-schema:
The json-schema library provides validation capabilities, but its performance can vary depending on the implementation and complexity of the schemas. It is generally suitable for most applications but may not be as optimized as ajv for large-scale or high-frequency validations.

Error Handling

ajv:
ajv provides detailed error reporting for validation failures, including the path to the invalid data and the specific validation rules that were not met. It also supports custom error messages and formats, allowing for flexible error handling.
json-parse-helpfulerror:
json-parse-helpfulerror focuses on improving error messages during JSON parsing. It enhances the standard JSON.parse method by providing more informative errors that include the position of the error in the JSON string, making it easier to debug parsing issues.

Schema Support

ajv:
ajv supports the latest JSON Schema standards, including Draft 2019-09 and Draft 2020-12. It also allows for the use of custom keywords and asynchronous validation, making it highly flexible and compliant with modern schema specifications.
json-schema:
The json-schema library supports the creation and validation of JSON Schemas, but its compliance with the latest standards may vary. It is more focused on schema definition and manipulation rather than being a validator, which may require additional tools for validation.

Modularity

json-parse-helpfulerror:
json-parse-helpfulerror is a lightweight library that can be easily integrated into projects without significant overhead. It does not have external dependencies, making it simple to use and deploy.
jsonlint-mod:
jsonlint-mod is designed as a modular ES module, allowing developers to import only the parts of the library they need. This modularity helps reduce bundle size and improves performance in modern JavaScript applications.

Ease of Use: Code Examples

ajv:

ajv Example

const Ajv = require('ajv');
const ajv = new Ajv(); // Options can be passed, e.g. {allErrors: true}
const validate = ajv.compile(schema);
const valid = validate(data);
if (!valid) console.log(validate.errors);

json-parse-helpfulerror:

json-parse-helpfulerror Example

import { parse } from 'json-parse-helpfulerror';
const jsonString = '{ invalidJson: }';
try {
  const data = parse(jsonString);
} catch (error) {
  console.error(error.message);
  console.error('Error location:', error.location);
}