Format, validate, minify, and view JSON in a tree.
This tool helps you format, validate, and minify JSON. Paste or type your JSON in the input area, then use the controls to validate syntax, beautify with indentation, or minify to a single line. The output panel shows the result, and you can view it as a tree to explore the structure.
JSON (JavaScript Object Notation) is a lightweight data format used to store and exchange data. It is human-readable and machine-parseable, and is widely used in web APIs, configuration files, and application data. JSON supports objects, arrays, strings, numbers, booleans, and null.
Use this tool when you need to validate API responses, format config files, debug JSON data, or prepare JSON for production. It also helps when copying minified JSON from the network tab or logs and you want to read it in a clear, structured way.
Validate: Check if a string is valid JSON before using it in code or storing it.
Format: Make minified or messy JSON readable with consistent indentation.
Minify: Shrink JSON for APIs, environment variables, or embedded data.
Tree view: Explore large JSON structures without scrolling through raw text.
Beautifying JSON adds indentation and line breaks so you can read and edit it easily. Minifying removes all unnecessary whitespace and newlines to reduce file size—useful for production APIs and faster loading. This tool does both: format for development and minify for deployment.
JSON supports a small set of value types. Understanding them helps you write and validate data correctly:
Objects: Unordered collections of key–value pairs wrapped in curly braces. Keys must be double-quoted strings.
Arrays: Ordered lists of values in square brackets. Elements can be any JSON type.
Strings: Text in double quotes. Use backslash to escape quotes and control characters.
Numbers: Integer or decimal numbers; no leading zeros (except 0) and no trailing zeros after a decimal point.
Booleans: The literals true and false, unquoted.
Null: The literal null, representing an empty or absent value.
Choose the right format for your situation:
Beautify for: Reading API responses, editing config files, debugging, and learning structure. Indentation and line breaks make nesting clear.
Minify for: Production APIs, environment variables, inline script data, and smaller payloads. Removes all unnecessary whitespace.
Validate when: Pasting from external sources, before saving to a database, or when debugging parse errors. Ensures strict JSON syntax.
Use tree view for: Large or deeply nested JSON. Expand and collapse nodes to find keys and values without scrolling.
A dedicated JSON beautifier and validator saves time when working with APIs, configs, or any JSON data.
Beautifying JSON means reformatting it with indentation and line breaks so it is easy to read. Minifying does the opposite: it removes extra spaces and newlines to reduce size.
Minified JSON is smaller and faster to transmit. It is often used in production APIs, configs, and when embedding JSON in HTML or environment variables.
No. All processing happens in your browser. Your JSON is never uploaded or stored on our servers.
The tool supports standard JSON: objects, arrays, strings, numbers, booleans, and null. It does not support comments or trailing commas; use Validate to catch syntax errors.
You receive minified JSON from a REST API. Paste it into the input, click Format, and choose 2 spaces or 4 spaces for indentation. The output shows the same data in a readable structure so you can inspect fields and nested objects.
Use case: Development and debugging
Your app config is stored as readable JSON. Before deploying, use Minify to produce a single-line string. You can paste the result into an environment variable or embed it in HTML, reducing size and keeping the format valid.
Use case: Deployment and storage
Data from forms, imports, or third-party APIs may not be valid JSON. Paste it into the tool and click Validate. If syntax is wrong, you get a clear error message; if valid, you can then format or minify as needed.
Use case: Validation and error checking
Last updated:
Check the units, assumptions and rounding before using a result. Health and financial estimates are educational and do not replace individual professional advice.
Found an error? Send the tool name, inputs, expected result and actual result so we can investigate.
Report a problem