JSON Formatter & Validator

What is JSON Formatter & Validator?

To format and validate JSON, paste your raw JSON string above and select your preferred indentation (2 or 4 spaces) or click "Minify" for compact payloads. Our parser complies with the RFC 8259 and ECMA-404 specifications, highlighting exact syntax error line numbers and column offsets locally in your browser with zero server transmission.

Designed for accuracy, speed, and privacy, this tool runs entirely on your local device with zero network latency.

How to Use the JSON Formatter & Validator

1. 1
   Paste your raw, unformatted, or minified JSON payload into the input editor.
2. 2
   Choose your formatting mode: "2 Spaces" or "4 Spaces" for human readability, or "Minify" to strip all whitespace.
3. 3
   Switch between Code View and Interactive Tree View to inspect nested keys, arrays, and value data types.
4. 4
   Click "Copy JSON" to copy the formatted output to your clipboard, or "Download" to save a .json file.

Formula & Calculation Logic

Parsing executes via browser-native JSON.parse() with automated character-offset error trapping. For formatting, the parsed abstract syntax tree is serialized back into a standardized string using JSON.stringify with customizable indentation spacing.