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JSON Formatter – Pretty Print & Validate JSON Online | OnlineUtilityTools

Advanced JSON editor with tree view, syntax highlighting, format, minify, validate, and real-time editing.

JSON Formatter – Format, Validate & Edit JSON Online

JSON (JavaScript Object Notation) is the standard format for APIs, configuration files, and data exchange. Developers need tools to validate JSON syntax, pretty-print messy data, minify for optimization, and edit structures interactively. Our online JSON formatter provides a dual-panel editor with tree view, real-time validation, and sync between formats. Instantly format, debug, and transform JSON without writing code or installing software.

When Should You Use This Tool?

  • API Responses:Format messy API responses to understand data structure and find issues quickly.
  • Config Files:Validate and format JSON configuration files used in applications and servers.
  • Data Debugging:Identify syntax errors, missing commas, and structural problems in JSON data.
  • Data Transformation:Edit JSON interactively using the tree view, add/remove fields, and export results.

Example of How This Tool Works

Input (Unformatted JSON):

{"name":"John","age":30,"email":"john@example.com"}

↓ Format ↓

Output (Pretty Printed):

{ "name": "John", "age": 30, "email": "john@example.com" }

The formatter converts compact JSON into readable indented format, making it easy to see structure and find errors. Use the tree view to edit values directly.

JSON Editor & Formatter
JSON Editor
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Tree View
Paste JSON to see tree view

How This Tool Works

1
Paste or Upload JSON
Paste your JSON data or upload a .json file to get started.
2
Edit in Tree or Text View
Use the text editor or interactive tree view to modify your JSON data.
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Format, Minify & Download
Pretty print, compress, validate, and download your JSON file.

Frequently Asked Questions

This JSON formatter works entirely in your browser—no data is sent to servers or stored anywhere. Use it for free to format, validate, minify, and edit JSON as much as you need.

Discover other developer tools for code formatting and data transformation available on OnlineUtilityTools.

Privacy and Data Safety

All JSON formatting, validation, and editing is performed locally in your browser. Your JSON data is never transmitted to our servers and is not stored anywhere. We do not collect, log, or track any data you process with this tool. Use it confidently for API responses, configuration files, and sensitive data.

Advanced JSON Editor for Developers

Our advanced JSON formatter combines a powerful text editor with an interactive tree view, giving you multiple ways to work with JSON data. The dual-panel interface lets you see both the raw JSON and its hierarchical structure simultaneously, making it easy to understand complex nested data.

Key features: Real-time synchronization between editor and tree view, inline editing of keys and values, node manipulation (add, delete, duplicate), format and minify functions, JSON validation with clear error messages, file upload and download, undo/redo history, and resizable panels for your preferred layout.

Whether you are debugging API responses, editing configuration files, or learning JSON structure, this tool provides everything you need. The tree view makes it easy to navigate deep hierarchies and modify specific values without manually finding them in the text.