What JSON Schema version does this tool generate?

The tool generates JSON Schema Draft v7, which is the most widely supported version across validation libraries, OpenAPI 3.0 tooling, and documentation frameworks. Draft v7 is compatible with most modern JSON Schema validators and is the standard expected by the majority of API toolchains in production use today.

Can I use the generated schema for OpenAPI or Swagger documentation?

Yes. JSON Schema Draft v7 is the schema format used by OpenAPI 3.0 for defining request bodies, response objects, and component schemas. You can paste the generated schema directly into your OpenAPI spec under the appropriate schema definition and it will be recognized by Swagger UI, Redoc, and most OpenAPI-compatible tooling.

Does the tool handle nested objects and arrays?

Yes. The generator performs a full recursive traversal of your JSON. Nested objects are mapped to JSON Schema object types with their own properties definitions. Arrays are identified and their item types are inferred from the contents. Deeply nested structures are handled correctly regardless of depth.

Is my JSON sent to a server when generating the schema?

No. The JSON Schema Generator runs 100% in your browser using JavaScript. Your JSON is never uploaded or transmitted to any server. Schema generation happens locally on your device, which makes it safe to use with internal API payloads, proprietary data structures, or any JSON you would not want leaving your machine.

How accurate is the auto-generated schema?

The generated schema is a strong starting point but should be reviewed before use in production. The tool infers types from whatever values appear in your sample JSON — if a field is null in the sample, it will be typed as null even if it can also be a string. For the most accurate schema, use a sample JSON that fully represents your actual data: all fields populated, all types represented, no placeholder nulls.

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JSON Schema Generator — Paste JSON, Get a Draft v7 Schema Instantly

Auto-Generate JSON Schema Free Online

Instance Data

Generated Schema (v7)

Full Recursive Traversal

Maps nested objects and arrays correctly at every level, no matter how deep.

Draft v7 Output

Produces valid Draft v7 schemas, the standard for OpenAPI 3.0 and modern validators.

100% Browser-Based

No server uploads. Generation happens locally, keeping your proprietary data safe.

Free with No Limits

Generate as many schemas as you need. No caps, no rate limits, no sign-in.

Quick Answer

Paste any sample JSON object — API response, config, or data model
Generate a valid JSON Schema Draft v7 automatically with one click
Get full recursive mapping — nested objects and arrays are all inferred
Use the output directly in OpenAPI specs, validation pipelines, or docs
Stay private — generation runs in your browser, your JSON is never uploaded

Professional JSON Logic

Writing JSON Schema by hand is tedious. For anything beyond a simple flat object — nested structures, arrays of objects, mixed types — it becomes a context-switching exercise.

The Utilx JSON Schema Generator takes your sample JSON and does the inference for you. Paste any JSON object and get a valid Draft v7 schema back immediately. It performs a full recursive traversal: nested objects, arrays, types, and required fields are all mapped automatically.

Privacy Protocol

Everything happens in your browser. Your JSON data is processed locally and never sent to our servers, keeping your API payloads and proprietary data models safe. No server logs, no tracking.

100% LOCAL BROWSER PROCESSING

When to Use This Tool

OpenAPI Documentation

Generate schema definitions for request and response objects ready to paste directly into your OpenAPI or Swagger spec.

Validation Pipelines

Create a schema from a known-good sample to use as the baseline for validating webhooks or incoming payloads.

Contract First Design

Quickly produce a schema draft for undocumented APIs to start enforcing data contracts between services.

Operational Workflow

PASTE SAMPLE

Copy a representative JSON object where all fields are populated with real data values.

CLICK GENERATE

Hit Generate. The tool traverses your structure recursively to infer types and required fields.

REVIEW OUTPUT

A valid Draft v7 schema appears. Review the inferred types and adjust nullable properties if needed.

COPY AND USE

One-click Copy grabs the schema for your spec, validation middleware, or documentation.

Real-World Use Case

"Spec in an Afternoon"

Lena, a backend developer, needed to write OpenAPI docs for an undocumented payment API with a dozen response shapes. Instead of writing schemas by hand, she pulled sample responses from staging, pasted them here, and had complete, validated Draft v7 schemas in minutes. What would have taken days took a single afternoon.

FAQs

Privacy Statement

This tool runs entirely in your browser using JavaScript — your JSON is never uploaded, never stored, and never transmitted to any server.

Browser Compatibility

Works in all modern browsers including Chrome, Firefox, Safari, and Edge — no plugins, extensions, or installations required.

Data & Docs