JSON Schema Validator
The JSON Schema Validator checks whether your JSON data conforms to a specified JSON Schema. Verify required properties, data types, expected formats, and other defined validation rules to help maintain consistent data structures. It's useful for API development, application testing, and checking structured data before integration. Use this free online JSON Schema Validator to test your JSON against your schema and identify validation problems.
Use your own data or load a sample to see how this tool works.
What is JSON Schema Validator?
A JSON Schema Validator checks whether JSON data conforms to the rules defined in a JSON Schema. Validate required properties, data types, expected formats, and other specified constraints to identify inconsistent or invalid data. This free online JSON Schema validation tool is useful for API development, application testing, data integration, and maintaining reliable structured data.
Why use this tool?
- Inspect or reshape structured data without writing a script.
- Find syntax and conversion problems before the data reaches your application.
- Work with API responses, configuration files and exported data in one place.
How to use JSON Schema Validator
- Step 1. Paste your data or load a file into the input area.
- Step 2. Run the tool and read the result or any error message.
- Step 3. Copy or download the output and check it against what your application expects.
Common use cases
Validate data against a JSON Schema
Schema validation checks data shape and constraints in addition to basic JSON syntax. This example uses Ajv.
import Ajv from "ajv";
const ajv = new Ajv();
const schema = { type: "object", properties: { id: { type: "number" } }, required: ["id"], additionalProperties: false };
const validate = ajv.compile(schema);
console.log(validate({ id: 42 })); // trueTools to use next
Continue the task with related utilities for the next step in your workflow.
Important notes
- Output depends on the input being valid, so fix syntax errors first.
- Check sensitive data handling before pasting private data into any online tool.
More JSON & Data Tools
JSON Schema Validator FAQ
What is JSON Schema Validator?
Validate JSON against a JSON Schema online. Check data types, required properties, formats, and validation rules with this free JSON schema tool.
Do I need an account to use JSON Schema Validator?
No. You can use it without creating an account.