JSON Formatter
Format, validate, and beautify JSON code instantly. A free, private, and 100% local online tool — your data never leaves your browser.
About this tool
Our JSON validation and formatting tool allows you to organize, correct, and standardize JSON structures in a simple and intuitive way. With just one click, the system analyzes the provided JSON and, if it is valid, a clean, well-formatted, and structured version is automatically generated. You can also customize the indentation of the formatting between 2 or 4 spaces, improving data readability, facilitating debugging, and optimizing code maintenance. This tool is ideal for developers who want to validate and format JSON online quickly and efficiently, organizing API data, configuration files, and payloads in a practical and productive manner.
Use Cases
- API Response DebuggingQuickly readable API responses that are otherwise returned as a single minified line.
- Config File EditingFormat JSON config files (package.json, tsconfig, etc.) for easier reading and editing.
- Data InspectionExplore nested JSON structures from logs, databases, or third-party integrations at a glance.
How It Works
Paste Your JSON
Copy and paste your raw or minified JSON into the editor.
Click Format
Press the Format JSON button. The tool validates and beautifies the code instantly.
Copy the Result
Copy the formatted output or start over with new JSON.
Questions & Answers
No. All formatting is done entirely in your browser. Your data never leaves your device.
The tool validates the JSON before formatting. If it detects a syntax error, it displays a clear error message so you can locate and fix the issue.
You can choose between 2-space and 4-space indentation. Both are widely used — 2 spaces is common in JavaScript projects, while 4 spaces is preferred in many other environments.