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JSON Formatter Tool

Format, minify, and validate JSON. Syntax highlighting makes errors easy to spot.

Last updated: 2026/10/16 Developer Feedback & bug reports
Input

How to Use

1

Enter JSON

Type or paste your JSON into the text area.

2

Format or Minify

Click "Format JSON" to prettify or "Minify JSON" to compress.

3

Copy Result

Copy the result to clipboard or download as a file.

About JSON Formatter

An online tool to format JSON for readability or minify it for size reduction. Includes syntax validation and highlighting. All processing happens in your browser, keeping your data private.

Features

  • Format & MinifyOne-click formatting for readability. Minify to reduce size for faster API requests.
  • Syntax HighlightingColor-coded keys, strings, numbers, and booleans. Errors are easy to spot.
  • ValidationReal-time JSON syntax checking with error line and position display.
  • Privacy ProtectedAll processing happens in your browser. Data is never sent to servers.

Use Cases

  • Debug API responses
  • Edit configuration files
  • Reduce JSON file size
  • Find and fix syntax errors
  • Improve log data readability

Related Tools & Guides

Beyond formatting and validation, use the JSON Diff tool to compare changes between two JSON files, the JSON ↔ CSV converter for spreadsheets, and the JSON ↔ YAML converter for config files. To turn an API response into TypeScript and other type definitions, try the JSON to Types generator, and read the JSON beginner’s guide to learn the basics.

FAQ

Is the JSON formatter free?
Yes, it is completely free. No registration required.
Why is my JSON invalid?
Common issues: trailing commas, single quotes, comments, or missing quotes around keys.
Can it handle large JSON files?
Yes, within browser memory limits. Usually handles files up to several MBs.
Is my data safe?
All processing happens locally in your browser. Data is never sent to our servers.
Can I change the indentation?
Yes, choose from 2 spaces, 4 spaces, or tabs at any time. Changing the indentation after formatting re-formats the output instantly.
Can I sort keys alphabetically?
Yes. Enable "Sort keys" before formatting and every object will have its keys reordered alphabetically (ascending). This makes diffs, reviews, and config files much easier to compare.
Can I unescape an escaped JSON string?
Yes. Use the "Unescape" button to restore a string escaped with \" or \n back into normal JSON. It is handy for inspecting JSON embedded as a string inside logs or code. You can also click "Sample" to load example JSON.

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Related Guides

What Is JSON? A Beginner Guide to Syntax, Writing, and Common Errors Learn what JSON is from the ground up: objects and arrays, the data types you can use, common syntax errors like trailing commas, and practical uses such as formatting, validation, YAML conversion, and diffing. What Is a REST API? HTTP Methods, Endpoints, and Status Codes Explained Learn the basics of REST APIs from scratch: what an API is, the REST approach, HTTP methods like GET/POST/PUT/DELETE, endpoints and resource design, status codes, JSON requests and responses, query parameters, and an overview of authentication.