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The tv4 npm package is a JSON Schema validator. It allows you to validate JSON data against a JSON Schema to ensure that the data structure conforms to a specified format. This is particularly useful for data validation, configuration management, and ensuring data integrity across systems.
Basic Validation
This feature allows you to validate a simple piece of data against a schema. In this example, a string is validated against a schema that requires a string type, resulting in a successful validation.
{"var tv4 = require('tv4');\nvar schema = {\"type\": \"string\"};\nvar result = tv4.validateResult('I am a string', schema);\nconsole.log(result.valid); // true"}
Complex Schema Validation
This feature demonstrates validating a more complex JSON object against a detailed schema. The schema specifies that the object must have a 'name' property of type string and an 'age' property of type integer with a minimum value of 0. The validation passes as the data meets these criteria.
{"var tv4 = require('tv4');\nvar schema = {\"type\": \"object\", \"properties\": {\"name\": {\"type\": \"string\"}, \"age\": {\"type\": \"integer\", \"minimum\": 0}}};\nvar data = {\"name\": \"John Doe\", \"age\": 30};\nvar result = tv4.validateResult(data, schema);\nconsole.log(result.valid); // true"}
Validation with Error Reporting
This feature showcases how tv4 can report errors when validation fails. In this example, attempting to validate a string against a schema that expects a number results in a validation error, which is then logged.
{"var tv4 = require('tv4');\nvar schema = {\"type\": \"number\"};\nvar result = tv4.validateResult('not a number', schema);\nif (!result.valid) {\n console.error(result.error);\n}"}
Ajv is another popular JSON Schema validator that is known for its performance and support for the latest JSON Schema standards. Compared to tv4, Ajv offers better performance and more comprehensive support for JSON Schema Draft 6 and Draft 7 features.
Joi is a powerful schema description language and data validator for JavaScript. Unlike tv4, which focuses on JSON Schema, Joi provides a fluent API for describing data schemas and includes built-in types and validation rules, making it more intuitive for some developers.
The jsonschema package is another validator for JSON Schema. It aims to provide a simple and straightforward implementation of JSON Schema validation. While similar in functionality to tv4, jsonschema may have differences in API design and error reporting.
FAQs
A public domain JSON Schema validator for JavaScript
The npm package tv4 receives a total of 1,975,757 weekly downloads. As such, tv4 popularity was classified as popular.
We found that tv4 demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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