𝗙𝗿𝗲𝗲𝗧𝗼𝗼𝗹 DEV

JSON Formatter

Free online JSON formatter, validator and beautifier. Format, validate and pretty print JSON instantly — 100% local, your data never leaves your browser.

Indent:

About this tool

Our online JSON formatter, validator and beautifier lets you organize, correct, and standardize JSON structures in a simple and intuitive way. With just one click, the tool analyzes the provided JSON and, if it is valid, a clean, well-formatted and pretty-printed version is automatically generated. You can also customize the indentation between 2 or 4 spaces, improving data readability, facilitating debugging, and optimizing code maintenance. This tool is ideal for developers who want a free JSON validator and formatter online to organize 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

1

Paste Your JSON

Copy and paste your raw or minified JSON into the editor.

2

Click Format

Press the Format JSON button. The tool validates and beautifies the code instantly.

3

Copy the Result

Copy the formatted output or start over with new JSON.

Questions & Answers

Is my JSON data sent to any server?

No. All formatting is done entirely in your browser. Your data never leaves your device.

What happens if my JSON has syntax errors?

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.

What indentation options are available?

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.

See also