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JSON Formatter & Validator Online — Free Tool

Identify syntax errors in JSON objects and auto-format your data for optimal readability.

Indent
Valid JSON
Privacy note: All processing happens entirely in your browser. No data is sent to our servers.

About this tool

JSON (JavaScript Object Notation) is a lightweight data format used in APIs, config files, and logs. This tool pretty-prints minified JSON with indentation and flags syntax errors such as missing commas, trailing commas, or mismatched brackets.

Paste a payload from an API response or config file to validate structure before you commit code or debug production issues. Formatting is local—your data never leaves the tab.

Common use cases

  • Debugging API responses during integration work
  • Cleaning config files before code review
  • Explaining nested objects to teammates in readable form

How to use

  1. Paste or type your input in the tool panel above.
  2. Choose formatting or conversion options if available.
  3. Copy the output for use in your document or project.

This page is available at /tools/json-formatter-validator/.

Related keywords

  • json formatter
  • json validator
  • json minify
  • json prettify
  • format json
  • validate json

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FAQ

What is JSON Formatter & Validator?

JSON Formatter & Validator is an online developer tool that identify syntax errors in JSON objects and auto-format your data for optimal readability.

How do I use the JSON Formatter & Validator?

Paste your code, JSON, token, or query into the editor, run the tool, and copy the formatted or converted result into your project.

Is this tool free?

Yes—this tool is free to use with no account required.

Does it run locally in the browser?

Yes. Calculations and transformations run in your browser—your input stays on your device.