Free, browser-based utilities for everyday developer workflows

Schema Inspector (JSON)

Inspect JSON payloads and generate Draft-07 JSON Schema with optional formats.

  • Infer a JSON schema from sample data.
  • View fields, types, optional and required keys.
  • Helpful for API contracts, validation, and documentation.

Use cases

Infer a Schema from JSON

Explore more in the Use cases library.

Input

Sample:
Array sampling:
View:

Schema output

Visual mode

Flat fields

How to use Schema Inspector (JSON)

Paste a JSON document or a JSON array of objects into the input. The tool infers a schema showing each key, its detected type, whether it is always present or optional, and example values sampled from the data.

Common use cases

Backend developers use this to quickly understand the shape of an unfamiliar API response without reading full documentation. Data engineers use it to generate a starting-point JSON Schema for validation pipelines, and QA teams use it to identify nullable or missing fields that need special handling in tests.

Why run this in your browser?

All processing happens locally in your browser. Your data never leaves your machine, making it safe for sensitive payloads, internal API responses, and confidential configurations.