JSON Formatter

📖 Tool Introduction

The JSON formatter handles the single most frequent action in API debugging: turning a compressed blob of payload into something readable, or squeezing it back into one line for transport. It doubles as a validator, telling you immediately whether the content parses and, when it does not, pointing at the exact line and column rather than offering a vague failure notice.

Four modes cover what comes up day to day. Beautify is the common one: it re-indents the structure while leaving key order and every value untouched, adding only newlines and spaces. Minify strips all removable whitespace, which suits config files and request bodies. Validate only runs the syntax check and prints a readable result with default indentation, useful when you simply need to know whether something parses. Escape as JSON string turns the whole payload into a string literal you can nest inside another layer of JSON, which saves a lot of fiddling when writing nested config or building test fixtures.

Indentation offers two spaces, four spaces or a tab, so you can match your team style. The result area is a monospace code block that scrolls for long content instead of stretching the layout when a single line runs long.

The statistics report input length, output length, size change percentage, maximum depth and total node count. The size figure shows at a glance how much compression saved. Maximum depth reveals how deeply the structure nests, and unusually deep payloads usually hint at a design problem upstream. Node count reflects the scale of the data, and read together with size it tells you whether pagination or field trimming is warranted.

Everything happens locally in the browser on top of native JSON parsing and serialisation, with no third party library and nothing sent to a server. That matters when what you paste is a production response or a config containing tokens and user data.

✨ Key Features

• Beautify: re-indents the structure while leaving key order and values untouched, adding only newlines and spaces
• One-click minify: removes all removable whitespace, ready for config files and request bodies
• Precise errors: a failed parse reports the line and column instead of a vague failure notice
• Escape output: turns the payload into a string literal you can nest inside another JSON layer
• Structure stats: output length, size change, maximum depth and node count for judging data scale
• Local parsing: built on native JSON with no third party library, and the payload never leaves the browser

🚀 How to Use

1. Paste JSON content into the input box on the left; any length is fine
2. Pick a mode in the right column; beautify is the default
3. In beautify mode choose the indent width: two spaces, four spaces or a tab
4. Press start; the result area shows the processed content with statistics underneath
5. When it looks right, press copy to take the text or download to save it as a file

⚠️ Things to Note

• Syntax only, not semantics: Valid formatting does not mean values match business rules; ranges still need checking
• Key order follows the parse result: Modern engines preserve original key order, but duplicate keys keep only the last value
• Batch very large content: Payloads of tens of megabytes use noticeable memory and may stall the page briefly
• Minifying cannot restore the original layout: Whitespace is discarded; recovering it means reformatting, not undoing
• Number precision follows the engine: Very large integers or high precision decimals can be affected by JavaScript number range