No more scrolling through minified nightmares.
Paste JSON. See it clearly. Format it. Validate it. Generate types.
The daily tool you'll keep open in a tab.
No more scrolling through minified nightmares.
Paste JSON. See it clearly. Format it. Validate it. Generate types. Done.
The daily tools you need. Right now.
No setup. No accounts. No complexity.
Format JSON
Pretty-print minified JSON instantly
Validate
Check syntax and structure errors
Generate Types
TypeScript, Zod, Python, Go, and 7 more
Diff JSON
Compare two JSON files side-by-side
Free forever. No accounts. No limits.
This is a standalone service. Use it 10 times a day. Keep it open in a tab. No Fyboard account required. No credit card. No catch.
Paste JSON. See It Clearly.
The simplest JSON viewer. Format, validate, and work with JSON instantly.
{
"name": "John",
"age": 30,
"city": "New York"
}Generate Types in 11+ Languages.
Transform JSON into production-ready type definitions. Customize names, reorder types, and export in your preferred language.
export interface User { id: string; name: string; email: string; isActive: boolean; roles: string[];}Custom Names
Rename types and fields to match your conventions
Drag & Reorder
Reorder type definitions with drag-and-drop
11+ Languages
Generate code in TypeScript, Go, Python, and more
Complete Toolkit.
12 core features covering every aspect of JSON manipulation, visualization, and analysis.
6 View Modes
Graph, Tree, Column, Compare, Analysis, and Force Graph views for every workflow.
Smart Editor
Monaco-based editor with IntelliSense, auto-completion, syntax highlighting, and error detection.
Type Generation
Generate TypeScript, Zod, JSON Schema, GraphQL, Go, Python, Java, C#, Rust, Kotlin, Swift types.
Visual Diff
Side-by-side comparison with semantic difference detection. Track additions, removals, and modifications.
Structure Analysis
Detect anomalies, missing fields, type inconsistencies. Auto-fix suggestions and field health metrics.
Force Graph
Interactive network visualization of JSON relationships. Drag, zoom, and explore complex data structures.
API Integration
Bidirectional data flow with API client. Import responses, export request bodies, collections support.
Documentation Export
Generate HTML, Markdown, OpenAPI, Postman, and Insomnia documentation from your JSON schemas.
Import Options
Import from URL or file upload. Support for JSON, JSON5, YAML, XML, TOML, CSV, and Base64 formats.
JSON Operations
Format, minify, copy, clear, validate, transform. Path-based updates and bulk operations.
Deep Search
XPath and JSONPath support for finding nodes deep within nested structures. Regex support included.
Gigabyte Engine
Stream-based parsing with web worker support. Handle files up to 2GB in the browser with zero lag.
Full Spectrum Control.
Built for Every Workflow.
From API development to data analysis, JSON Viewer adapts to your needs.
API Development
Validate API responses, generate TypeScript interfaces, and test request/response schemas.
{
"users": [
{
"id": "usr_123",
"name": "John Doe",
"email": "john@example.com",
"role": "admin"
}
],
"pagination": {
"page": 1,
"total": 100
}
}Works with Everything.
Bidirectional data flow, multiple import sources, and extensive export options.
API Client Integration
Seamless bidirectional data flow between JSON Viewer and API Client
Import & Export
Multiple import sources and export formats for maximum flexibility
// Load API response into JSON Viewer
const response = await fetch('/api/users');
const data = await response.json();
jsonViewer.loadFromApiResponse(data);
// Export JSON as request body
const requestBody = jsonViewer.exportForApiRequest();
await fetch('/api/users', {
method: 'POST',
body: JSON.stringify(requestBody)
});Compile your
Raw Data.
No more scrolling through minified nightmares.
Format, validate, and analyze gigabytes of JSON in seconds.