JSON Schema Visualizer
Visualize JSON Schema as an interactive tree with type badges, required fields, $ref expansion, combinator branches, and structural issue detection - free,
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What is JSON Schema Visualizer?
The JSON Schema Visualizer renders any JSON Schema as an interactive, collapsible tree. Each object property, array item, enum option, union branch, and $ref link gets a color-coded type badge with its constraints shown inline, so complex API contracts become readable at a glance.
Key Benefits
- Understand inherited or third-party schemas in seconds
- Catch structural mistakes before they reach production
- Follow $ref chains with safe recursion handling
- Quantify schema complexity with built-in statistics
- Keep proprietary schemas private - everything is client-side
Common Use Cases
- •Reviewing OpenAPI component schemas before merging
- •Onboarding developers onto a large existing API
- •Debugging validation failures caused by wrong types or refs
- •Documenting internal data contracts for teams
- •Auditing schema depth and complexity before refactoring
Visualize a JSON Schema as a Tree
- Paste the schema: Drop your JSON Schema into the input or press Load sample to try a User schema with $defs, enums, unions, and a $ref.
- Press Visualize: The tree renders with colored type badges and auto-expands the first two levels; use Expand all or Collapse all, or click any chevron to drill into a branch.
- Review the statistics: Ten counters — objects, arrays, properties, required, enums, refs, unions, combinators, definitions, and max depth — summarize the shape of your schema.
- Fix the listed issues: Check the Issues section for errors and warnings with JSON pointer paths, such as unresolved $ref values, and press Copy to take the schema back for editing.
Key Features
- Collapsible tree view with color-coded type badges for every node kind
- Local $ref expansion into definitions and $defs with recursion detection
- Statistics panel: objects, arrays, properties, required, enums, refs, and max depth
- Structural issue detection: unresolved refs, required-not-in-properties, unknown types
- Draft-07 and 2020-12 keyword support including prefixItems and combinators
- Runs entirely in your browser - schemas never leave your machine
Frequently Asked Questions
What do the colored badges in the tree mean?
Each node gets a badge for its schema kind — object, array, string, number, integer, boolean, null, union, enum, $ref, or any — so you can scan a large schema and spot nesting, arrays, and references at a glance.
How are $ref links handled?
Local references into $defs or definitions are resolved and expanded inline with a $ref badge, while refs that point nowhere are marked as unresolved and reported in the Issues list with their JSON pointer path.
What do the statistics tell me?
The counters include objects, arrays, properties, required fields, enums, refs, unions, combinators (allOf, anyOf, oneOf, not), definitions, and maximum depth — a quick health profile of the schema.
Does this validate my JSON Schema?
It is a structural review, not a full validator: it parses the schema, walks every node, and reports errors and warnings such as missing or unresolvable references. Your schema never leaves the browser.