Is my JSON data safe when I use this tool?

Yes. All processing happens entirely in your browser using JavaScript. Your data never leaves your device — nothing is sent to any server.

What is the maximum JSON size this tool can handle?

There is no hard limit. The tool runs in your browser, so it can handle files as large as your browser's memory allows — typically several megabytes without issues.

Can I format JSON with tabs instead of spaces?

The tool uses 2-space indentation by default, which is the most common convention in modern development. You can copy the formatted output and adjust indentation in your editor.

What does "minify" do?

Minifying removes all unnecessary whitespace (spaces, tabs, newlines) from JSON. This reduces file size for storage or transmission while keeping the data identical.

Why is my JSON showing as invalid?

Common causes include trailing commas (not allowed in JSON), single quotes instead of double quotes, unquoted keys, or missing commas between elements. The error message will point to the exact location of the issue.

JSON Formatter & Validator

Format, minify, and validate JSON — all in your browser.

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy for humans to read and write, and easy for machines to parse and generate. It is the most widely used format for web APIs, configuration files, and data storage in modern software development.

JSON supports six data types: strings, numbers, booleans, null, arrays, and objects. A valid JSON document must have an object or array as its root element, and all strings must use double quotes.

How to Use This JSON Formatter

Paste your JSON into the input area on the left
Click Format to pretty-print with proper indentation
Click Minify to remove all whitespace for compact output
Click Copy to copy the result to your clipboard

The tool automatically validates your JSON as you type. If there's a syntax error, it will show the error message with the line and position of the problem.

Common JSON Use Cases

API debugging — Format API responses to read them easily
Config files — Validate package.json, tsconfig.json, and other config files
Data inspection — Explore nested data structures visually
Minification — Reduce payload size before sending data over the network
Documentation — Format JSON examples for technical docs and READMEs

JSON vs Other Data Formats

JSON is often compared with XML, YAML, and TOML. JSON's advantage is its simplicity and universal browser support. YAML is more human-readable for configuration but is whitespace-sensitive. XML supports schemas and namespaces but is more verbose. For web APIs and JavaScript applications, JSON is the de facto standard.

Frequently Asked Questions

Is my JSON data safe when I use this tool?: Yes. All processing happens entirely in your browser using JavaScript. Your data never leaves your device — nothing is sent to any server.
What is the maximum JSON size this tool can handle?: There is no hard limit. The tool runs in your browser, so it can handle files as large as your browser's memory allows — typically several megabytes without issues.
Can I format JSON with tabs instead of spaces?: The tool uses 2-space indentation by default, which is the most common convention in modern development. You can copy the formatted output and adjust indentation in your editor.
What does "minify" do?: Minifying removes all unnecessary whitespace (spaces, tabs, newlines) from JSON. This reduces file size for storage or transmission while keeping the data identical.
Why is my JSON showing as invalid?: Common causes include trailing commas (not allowed in JSON), single quotes instead of double quotes, unquoted keys, or missing commas between elements. The error message will point to the exact location of the issue.