Validating data is an important process. It helps to ensure that applications operate smoothly. One powerful tool for this purpose is the JSON Schema Validator.
In this post, I will introduce you to the fundamentals of using JSON Schema to validate your data, helping you ensure your JSON data structure follows the specified requirements.
What is JSON Schema?
JSON Schema is a declarative language for defining structure and constraints for JSON data.
JSON Schema will also be considered as a design document for input data as it is declared to define the rules, structure and constraints for input data.
What is JSON Schema Validator?
JSON Schema Validators are tools that implement the JSON Schema specification.
JSON schema validator help to check whether the input JSON data complies with the rules and structure defined in the created JSON Schema.
Try it out!
Step 1: Create a JSON Schema
To understand how to define a JSON schema, refer to the link bellow
https://json-schema.org/understanding-json-schema/reference
In this post, I will create a simple JSON Schema for employee information as bellow
Step 2: Prepare JSON Data
Prepare your JSON Instance with valid data (valid_data.json)
Step 3: Install Ajv JSON schema validator
Ajv is used by a large number of JavaScript applications and libraries in all JavaScript environments - Node.js, browser, Electron apps, WeChat mini-apps etc. It allows implementing complex data validation logic via declarative schemas for your JSON data, without writing code.
Install AJV JSON schema validator using npm
Step 4: Validate JSON Data with Javascript
Now, try it with JavaScript (validate.js)
Directory structure
Execute the javascript source code to validate the valid_data.json
Validation Result is valid data with valid_data.json
Now, I try to create an invalid_data.json with invalid data
Load it with javascript
Directory structure
Execute validate.js file
Validation Result is invalid data with invalid_data.json
To check error details, use the website https://www.jsonschemavalidator.net/
When to use a JSON Schema validator?
If you need to validate JSON data in your application, JSON Schema provides a standardized way to check the structure and content of the data. This is especially useful for ensuring data integrity and consistency.
Conclusion
By defining clear rules and constraints, JSON Schema not only minimizes errors but also enhances reliability and consistency in your applications.
JSON Schema validator helps you ensure that JSON data is structured and validated correctly.
Take the time to research and implement JSON Schema validator in your projects. You'll find that managing and validating data becomes easier and more efficient than ever before.
References
https://json-schema.org/overview/what-is-jsonschema
https://ajv.js.org
https://www.jsonschemavalidator.net
https://json-schema.org/understanding-json-schema/reference
https://json-schema.org/img/json_schema.svg
https://hailbytes.com/wp-content/uploads/2022/02/JSON_SchemaTitle_Image.png