JSONForge — Free JSON Formatter, Validator & Minifier Online

Input JSON

Paste JSON

Output

Format / Beautify

Adds proper indentation and line breaks to minified JSON, making it human-readable. Essential for debugging API responses.

Minify

Removes all whitespace and line breaks from JSON. Reduces payload size for production APIs and localStorage storage.

Validate

Checks that your JSON follows the specification. Catches missing commas, unquoted keys, trailing commas, and syntax errors.

Escape / Unescape

Converts JSON to an escaped string (for embedding in other JSON) or reverses the process. Useful for nested JSON in API payloads.

How to Use JSONForge

Paste your JSON into the Input panel on the left.
Select the operation: Format, Minify, Validate, Tree View, Escape, or Unescape.
Click Run (or press Ctrl+Enter) to process the JSON.
Copy the output with the Copy button or download it as a .json file.

Why Use JSONForge to Format JSON

Working with raw API responses, configuration files, or database exports means regularly encountering minified JSON — a single long line with no indentation that is nearly impossible to read. JSONForge instantly beautifies it with proper indentation and line breaks, making the structure immediately visible. The tree view mode goes further, letting you expand and collapse nested objects and arrays interactively.

The validator catches common JSON errors that are hard to spot by eye: missing commas, trailing commas, unquoted keys (which are valid JavaScript but invalid JSON), unclosed brackets, and unescaped special characters. The escape and unescape modes handle the common need to embed a JSON string inside another JSON value.

Frequently Asked Questions

What is the difference between Format and Minify?
Format adds indentation and line breaks to make JSON human-readable. Minify removes all whitespace to create the smallest possible JSON string — useful for reducing API payload size.
Why does my JSON fail validation even though it looks correct?
Common issues: trailing commas after the last element (not allowed in JSON), single quotes instead of double quotes, unquoted keys, or comments (JSON does not support comments).
Is my JSON data sent to a server?
No. All processing happens in your browser using native JavaScript. Your JSON data never leaves your device.