JSON formatter and validator online

Format, validate, and minify JSON data in real time. Inspect syntax errors, filter with JSONPath, and preview interactive tree views in your browser.

Input
1
Input is empty
Output
Indent:
1
Result will appear here...
Online JSON Formatter Features
Clean up, validate, and convert JSON data in real-time inside your browser memory.
Prettify & Auto-Indent
Format minified or messy JSON with customizable spacing (2 spaces, 4 spaces, or tabs) for clear readability.
Real-Time Syntax Validation
Detect syntax errors in real time with exact line numbers and column positions for missing quotes or trailing commas.
Minify & Compress Payload
Strip white space and newlines to compress JSON strings for optimized network payload transfers.
Convert to TypeScript & YAML
Generate clean TypeScript interfaces and YAML config structures automatically from your JSON payload.
How to Format JSON in 3 Steps
  1. Paste JSON Payload
    Copy your raw JSON payload and paste it into the editor or upload a local file.
  2. Select Processing Action
    Click Format, Minify, or select conversion to TypeScript/YAML.
  3. Export Formatted Result
    Copy the formatted JSON to your clipboard or download it as a clean file.
Why Use Online JSON Formatter?
Essential tool built for web developers, API engineers, and data analysts.
API Debugging & Inspection
Pretty print raw API responses from Postman, cURL queries, or server logs to inspect property hierarchies.
Config File Validation
Verify JSON syntax correctness before committing config files to Git repositories or deployment servers.
Frontend Type Generation
Convert API response JSON objects into strongly-typed TypeScript interfaces for React or Vue applications.
YAML Config Conversions
Transform JSON files into YAML syntax for Docker, Kubernetes, and CI/CD pipeline configurations.
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Frequently Asked Questions
Is it safe to paste confidential JSON data into this formatter?
Yes! All formatting, syntax validation, and conversions execute locally inside your web browser. Your data is never sent to external servers.
What is the difference between valid JSON and JavaScript objects?
Strict RFC 8259 JSON requires double quotes around property keys and string values, and disallows trailing commas.
What does minifying JSON do?
Minification removes all unnecessary whitespace characters and line breaks to minimize payload size for network transfers.
How does the validator highlight syntax errors?
Our parser pinpoints the exact line number and character column where missing brackets or invalid characters occur.
Is JSON Formatter free to use?
Yes, our tool is 100% free with unlimited usage.