🧰Online Tools

JSON Formatter

Format, minify, and validate JSON data

About This Tool

JSON (JavaScript Object Notation) is a lightweight data interchange format widely used in web development, API interfaces, and configuration files. This tool helps you quickly format (beautify) JSON data for easier reading, compress JSON to reduce transmission size, and validate JSON syntax with error hints. All processing is done locally in your browser - your data is never uploaded, so you can safely process sensitive configuration information or API data.

How to Use

  1. Paste the JSON data you need to process into the 'Input JSON' text box
  2. Click 'Format' to beautify JSON into a readable indented format
  3. Click 'Minify' to compress JSON into a single-line compact format
  4. Click 'Validate' to check if JSON syntax is correct
  5. After processing, click 'Copy' to copy the result to clipboard

Common Use Cases

  • API debugging: Format JSON data returned from interfaces for viewing and analysis
  • Code development: Beautify configuration or data files to improve code readability
  • Data transfer: Compress JSON to reduce network transmission size and improve performance
  • Error troubleshooting: Validate JSON syntax to quickly locate format errors
  • Documentation: Format JSON example code for technical documentation
  • Learning: View JSON data structures to learn API design

FAQ

Q1: What is JSON format?

JSON stands for JavaScript Object Notation, a lightweight data interchange format. It stores data using key-value pairs and supports strings, numbers, booleans, arrays, objects, and null data types. JSON format is easy for humans to read and write, and easy for machines to parse and generate.

Q2: What's the difference between format and minify?

Formatting adds indentation and line breaks to JSON, making the data structure clearer and easier to read, suitable for development and debugging. Minifying removes all unnecessary whitespace, converting JSON to a single-line compact format to reduce file size, suitable for network transmission or storage.

Q3: Why does JSON validation fail?

Common reasons include: 1) Using single quotes instead of double quotes; 2) Extra comma after the last element; 3) Key names not in quotes; 4) Using illegal values like undefined; 5) Comments (JSON doesn't support comments); 6) Unescaped special characters.

Q4: How large JSON data can be processed?

This tool can process JSON data up to several MB. However, since it runs in the browser, processing very large files may affect performance. For extremely large JSON files, we recommend using professional editors or command-line tools.

Q5: Is the processed JSON data safe?

Completely safe. This tool runs locally in your browser, and all JSON data is only processed on your device, never uploaded to any server. Data is cleared when you close the page.