What schema formats does the validator support?

JSON Schema (Draft 7 and Draft 2020-12), OpenAPI 3.0 and 3.1 response schemas, and custom field-level assertions (status code, field presence, value ranges).

How does schema validation catch breaking changes?

When your API returns a field with the wrong type, removes a required field, or changes a value format, the schema validator catches it immediately. Without schema validation, these breaking changes only surface when client applications start failing.

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Free API Schema Validator

Paste your API response and schema. Get instant validation showing every field mismatch, type error, and missing required field.

What We Check

1
Enter API endpoint or paste JSON — Enter API endpoint URL, or paste response JSON directly.
2
Upload schema — Upload or paste your expected JSON Schema or OpenAPI spec.
3
API request — API request made and response captured.
4
Field-by-field validation — Response body validated against schema field by field.
5
Type mismatch detection — Type mismatches detected (e.g. string returned where integer expected).
6
Missing field flagging — Missing required fields flagged.
7
Extra field reporting — Extra fields not in schema reported.
8
Full diff report — Full diff report showing passing and failing assertions.

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Frequently Asked Questions

What schema formats does the validator support?: JSON Schema (Draft 7 and Draft 2020-12), OpenAPI 3.0 and 3.1 response schemas, and custom field-level assertions (status code, field presence, value ranges).
How does schema validation catch breaking changes?: When your API returns a field with the wrong type, removes a required field, or changes a value format, the schema validator catches it immediately. Without schema validation, these breaking changes only surface when client applications start failing.

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