JSON Schema Validator
Validate JSON payloads against JSON Schema drafts using Ajv with configurable strictness, coercion, and error reporting — all offline in your browser.
How It Works
Provide Schema & JSON Payload
Paste or upload your JSON Schema on the left and the JSON document you want to validate on the right. Leave the payload empty to validate the schema alone.
Configure Validation Rules
Toggle allErrors, type coercion, additional property handling, and strict mode to match your environment or API contract expectations.
Run Ajv Validation Instantly
Validation executes locally via Ajv, returning readable summaries with instance paths, failing keywords, and contextual parameters for each issue.
Export or Share Results
Copy the formatted report, download the results, or store the run in tool history for audit trails, QA reports, or regression test artifacts.
Problems It Solves
Problem
Schema mismatches reach production because teams lack a quick way to validate JSON payloads against updated contracts.
Solution
Catch contract violations before deploys with instant, browser-based Ajv validation that highlights failing paths and keywords.
Problem
Maintaining strict schemas across microservices is difficult when optional features rely on different validation rules.
Solution
Toggle Ajv options like allowUnionTypes, removeAdditional, and strict mode per environment to mirror staging and production behavior.
Problem
Debugging Ajv errors can be cryptic when instance paths and params are buried in the console.
Solution
Readable error summaries with instance paths, keyword context, and structured metadata make triaging validation failures fast for any teammate.
Why Choose This Tool
Powered by Ajv
Leverages the industry-standard Ajv validator with configurable drafts and options, so results match modern backend implementations.
Privacy-First Validation
Schemas and payloads never leave your browser, making it safe for regulated data and pre-release APIs.
Actionable Reporting
Readable Markdown output, structured metadata, and history tracking help teams document issues and automate regression checks.
Developer-Friendly UX
Dual editors, copy/download helpers, and auto-validation keep productivity high when iterating on schemas or onboarding teammates.
Frequently Asked Questions
Which JSON Schema drafts are supported?
Can I validate without providing data?
What does removing additional properties do?
How do I validate multiple documents?
Does the tool send my data anywhere?
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