{SafeJSON}

API and webhook schema debugging

Validate API response schemas, Validate webhook payloads, and Debug schema errors

SafeJSON Schema Validator helps validate API responses, webhook payloads, and request/response examples against JSON Schema. It keeps the workflow lightweight: browser-local JSON workflow, no pasted-content upload for core tools, and 5 free runs before upgrade.

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API response validation

Validate API response schemas when a deployed endpoint starts returning missing fields, wrong types, or unexpected enum values.

Sensitive because: API examples can include account state, field names, feature flags, and internal contract assumptions.

SafeJSON keeps this as a lightweight schema debugging workflow with no pasted-content upload for core tools.

webhook payload shape validation

Validate webhook payloads from sandbox and production-like events before changing handlers or retry logic.

Sensitive because: Webhook data can include customer identifiers, billing state, event IDs, and provider-specific metadata.

Paste the payload and schema, review Error path and Error message, then verify local processing with DevTools.

request/response example validation

Validate request/response examples used in docs, support tickets, and debugging notes without building an API governance platform.

Sensitive because: Examples often reveal endpoint paths, object shapes, and validation assumptions.

Use the sample pair to debug schema errors quickly while keeping the workflow browser-local.

ProSchema Validator is a Pro feature. Free for occasional use, unlimited with Pro.
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Schema Validator: 5 of 5 free runs left in this browser.

Load sample schema and payload pairs for API, webhook, or request/response validation.

Draft support clarity: The current validator uses Ajv 8 default JSON Schema behavior. Check the validator output for supported schema behavior.

JSON Data
JSON Schema
ResultError path and Error message are shown separately

{ }

Paste JSON data and a Schema, then click Validate

Pro workflow

Validate API contracts without building a governance platform

Schema Validator, JSON Diff, JSONPath, and JWT Decoder are built for sensitive JSON workflows: API responses, webhook payloads, configs, and auth debugging. No pasted-content upload for core tools.

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About SafeJSON Schema Validator

SafeJSON Schema Validator validates API responses, webhook payloads, and request/response examples against JSON Schema with no pasted-content upload for core tools.

Is SafeJSON Schema Validator safe for validating production schemas?
SafeJSON Schema Validator is designed for sensitive API and webhook schema debugging. JSON data and JSON Schema are validated in the browser workflow with no pasted-content upload. This matters for internal schemas that may reveal system architecture.
How to verify that SafeJSON Schema Validator does not upload your data?
Open SafeJSON Schema Validator, open DevTools (F12) and go to the Network tab. Paste your JSON, enter your JSON Schema, and run validation. Check that no network request contains your pasted content.
What JSON Schema version does SafeJSON support?
The current validator uses Ajv 8 default JSON Schema behavior, which is suitable for common draft-07-style schemas. Check the validator output for supported schema behavior.
Can I validate internal API schemas without exposing system architecture?
SafeJSON Schema Validator is built for internal API schemas, webhook payload shapes, and request/response examples. It uses a browser-local JSON workflow with no pasted-content upload, so you can inspect validation behavior without adding a schema backend.
How does the Schema Validator report errors?
SafeJSON reports validation errors with the JSON path where the error occurred and a readable message about the failed constraint. The error list is designed to make schema debugging easier without changing the validator engine.