Free Online JSON Tools Hub - DataLensia

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JSON
Tools

Select a tool to work with your JSON data

JSON Editor

Edit JSON with syntax highlighting and validation

JSON Validator

Validate JSON syntax with auto-fix, formatting, minification & detailed analysis

JSON Comparator

Compare two JSON files with highlighted differences

Schema Generator

Generate JSON Schema from your JSON data automatically

Schema Fake Data

Generate mock data or rich datasets matching any JSON Schema

JSON Convert

Convert and export JSON into 18+ formats

Transform Builder

Visual JSON mapper with drag-and-drop field mapping and transformation chains

JSON to UML

Convert JSON structures into visual UML diagrams with live preview

JSON to Mermaid

Convert JSON structures into visual Mermaid diagrams with live preview

Mock JSON API

Generate stateless API endpoints with dynamic parameters, custom status codes and latency

JSON Flow Diagram

Visualize JSON as interactive node-based flow diagrams with ReactFlow

Data Pipelines

Build visual node-based data processing workflows with real-time execution

Popular Guides & Recipes

How to fix invalid JSON errors

Learn how to use the auto-fix engine to repair broken JSON syntax.

Compare JSON files side-by-side

Master the structural comparison tool for complex API responses.

Generate JSON Schema from data

Automatically create validation schemas from sample JSON files.

Visual Data Pipelines (ETL)

Build visual workflows to transform, filter and merge datasets.

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