JSON Formatter & Validator User Guide

1. Overview

This is a clean and professional online JSON processing tool. Core capabilities include:

• Formatting (Pretty Print): turn minified or messy JSON into clear, indented structure.
• Compacting: remove extra spaces and line breaks to produce a single-line JSON string for transmission efficiency.
• Validation: check whether JSON syntax is valid and report errors.
• Repair: try to auto-fix common JSON issues such as missing quotes or trailing commas.
• Transform and Query: in Advanced Mode, transform data and run queries on JSON.
• View Switching: in Advanced Mode, switch between text view and table view for easier inspection.
• Schema Validation: in Advanced Mode, validate data shape with JSON Schema.
• Quick Actions: copy output with one click and download as file.

2. Quick Start

Input JSON

• Drag and drop a .json file into the tool area.
• Or paste your JSON into the input editor.

Run Actions

• Click “Format” to output readable JSON.
• Click “Compact” to generate single-line JSON.
• The tool validates content and reports problems when syntax is invalid.

Use Output

• Click “Copy” to copy the result to clipboard.
• Click “Download” to save the result as a .json file.

3. Core Features

3.1 Basic Features

Button	Description
Format / Pretty	Indents JSON by hierarchy (commonly 2 or 4 spaces) to improve readability and editing.
Compact	Removes line breaks and extra spaces to produce compact one-line JSON, useful for API payloads and storage optimization.
Copy	Copies the current processed output to the system clipboard.
Download	Exports the current result as a local .json file.
Auto Repair	Attempts to fix non-fatal issues (for example, unquoted property names or trailing commas). Severe structural errors still require manual fixes.

3.2 Advanced Mode

After enabling “Advanced Mode”, extra capabilities appear:

• Text / Table Views:
  • Text View: standard code-style JSON view.
  • Table View: renders JSON data (especially object arrays) in rows and columns for quick reading.
• Transform: process data such as filtering array items, selecting fields, or modifying values.
• Query: extract target data from complex JSON structures with query syntax.
• Schema Validation: paste a JSON Schema and validate whether current data matches required structure, types, and constraints.

4. FAQ & Tips

Q1: When should I use “Auto Repair”?

Use it when JSON is invalid due to small formatting mistakes.
Example: {name: "John"} should be {"name": "John"}.

Q2: What are table view limitations?

Table view works best for arrays of objects with similar structure. For deeply nested or inconsistent JSON, switch back to text view.

Q3: How can I validate against API requirements?

1. Get the JSON Schema from API documentation.
2. Open Schema validation in Advanced Mode and paste the schema.
3. Paste your JSON data and review validation results.

Q4: Will my data be leaked?

The tool is typically processed in the browser. For security, avoid pasting production secrets such as passwords, tokens, and private keys.