Free JSONSchemaValidator.net Alternative
JSONSchemaValidator.net (by Newtonsoft) is a popular online JSON Schema validator that supports Draft 3, Draft 4, Draft 6, Draft 7, Draft 2019-09, and Draft 2020-12. It provides an interactive interface where you can paste your JSON and schema to validate them instantly. While it's free to use, the site shows ads and requires navigating between different sections. Fixie's JSON Schema Validator offers the same validation capabilities with a cleaner, ad-free interface and client-side processing for better privacy.
Try JSON Schema Validator Free →JSON Schema Validator vs JSONSchemaValidator.net
| Feature | Fixie JSON Schema Validator | JSONSchemaValidator.net |
|---|---|---|
| Price | Free forever | Free |
| Signup Required | No | No |
| Privacy / Data Handling | 100% client-side validation | Data sent to server |
| Supported Drafts | Draft 4, 6, 7, 2019-09, 2020-12 | Draft 3, 4, 6, 7, 2019-09, 2020-12 |
| Ads | None | Yes |
| Error Highlighting | Yes (inline with line numbers) | Yes (detailed error messages) |
Why Choose Fixie?
JSONSchemaValidator.net has been a reliable tool for developers who need to validate JSON documents against schemas. It supports a comprehensive range of JSON Schema draft versions from Draft 3 all the way to the latest Draft 2020-12 specification, making it compatible with legacy and modern schemas alike.
The main drawback is that your data is sent to the server for validation, which may be a concern when working with sensitive information. The interface also displays ads, which can be distracting during development work.
Fixie's JSON Schema Validator performs all validation entirely in your browser using JavaScript. Your JSON and schema never leave your machine, ensuring complete privacy. The interface is clean and ad-free, with syntax highlighting and inline error messages that make it easy to spot validation issues. Both tools support the same modern draft versions (4, 6, 7, 2019-09, 2020-12), though Newtonsoft also includes Draft 3 if you're working with very old schemas.
How to Use JSON Schema Validator
Step 1: Open the Validator
Go to fixie.tools/json-schema — no account needed.
Step 2: Paste Your JSON
Copy your JSON document into the left editor panel. Syntax highlighting will help you spot any formatting issues.
Step 3: Add Your Schema
Paste your JSON Schema into the right editor panel. Select the appropriate draft version from the dropdown.
Step 4: Validate
Click Validate to check if your JSON conforms to the schema. Any errors will be highlighted with line numbers and descriptions.