Does this call my API?

No. It only validates the static document you provide.

Paste JSON here. Convert YAML to JSON first if your source is YAML-only.

OpenAPI Validator

In the same workflow: Webhook Tester and API Response Analyzer.

OpenAPI Validator

Validate OpenAPI 2.0 (Swagger) or 3.x JSON. Checks structure and paths. Paste JSON only. For full validation use the official validator (validator.swagger.io). More validators: validatethis.org.

OpenAPI / Swagger JSON

Issues

1 issue(s)

error
(root)
Invalid JSON

Related tools

Swagger Editor (validator.swagger.io) — full OpenAPI validation
Response Schema Validator — JSON vs schema
Request Body Validator — validate request JSON

Why use OpenAPI Validator?

Shipping an invalid OpenAPI document breaks codegen, documentation portals, and contract tests. Paste JSON for 2.0 or 3.x to catch structural issues, missing paths, and reference problems before CI fails halfway through a release.

Practical tips

Validate after merging multiple YAML files; partial specs often miss required openapi/version fields.
Pair with JSON Diff when comparing two spec revisions side by side.
Keep examples realistic—they surface schema contradictions early.

Common questions

Does this call my API?: No. It only validates the static document you provide.
YAML or JSON?: Paste JSON here. Convert YAML to JSON first if your source is YAML-only.

About

Validate OpenAPI 2.0 / 3.x JSON structure and paths. Check spec before deploy. Free OpenAPI/Swagger validator.

Related tools

Used together

Next step

After openapi-validator, continue with Webhook Tester to validate the next API or webhook layer.