Format, validate, and minify JSON instantly. No data leaves your browser.
Paste your raw JSON here.
Formatted with 2 Spaces indentation.
Formatted output will appear here.
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A JSON formatter takes raw, unindented, or minified JSON text and restructures it into a human-readable format with consistent indentation and line breaks. This tool also validates your JSON against the official specification, catching syntax errors before they reach your API, database, or application code.
JSON (JavaScript Object Notation) is the dominant data interchange format on the web. Nearly every REST API, configuration file, database export, and webhook payload uses JSON. When that data arrives as a compressed single line or contains a typo, a formatter and validator becomes an essential debugging tool.
Raw API responses are often minified for transmission efficiency, stripping all whitespace to reduce payload size. That is great for machines but unreadable for humans trying to debug an integration. Formatting expands the JSON into an indented tree structure so you can instantly see the shape of the data, navigate nested objects, and spot missing or unexpected fields.
Validation catches errors that would silently break your application. Common mistakes include trailing commas after the last item in an array or object, single-quoted strings instead of double quotes, unquoted key names, and missing or extra curly braces. A validator surfaces these issues immediately with a clear error message, saving hours of debugging.
Paste your JSON into the input panel on the left. The validator runs instantly as you type, showing a green status bar for valid JSON or a red error message explaining exactly what is wrong. Once the JSON is valid, click Format or Beautify to produce an indented, readable version in the output panel on the right.
Choose your preferred indentation style using the 2 Spaces, 4 Spaces, or Tab buttons. Click Minify to compress the JSON back to a single line for use in API requests or configuration values. Use Copy Output to send the result directly to your clipboard, or Clear to start fresh with new JSON.
Trailing commas are the most frequent JSON error. JSON does not allow a comma after the last item in an array or object. Remove the final comma before the closing bracket or brace.
Single-quoted strings cause parse failures because JSON requires double quotes for all strings and key names. Replace any single quotes with double quotes throughout the document.
Unquoted keys are valid in JavaScript objects but not in JSON. Every key must be wrapped in double quotes. For example, { name: 'Alice' } is not valid JSON. It must be { "name": "Alice" }.
Control characters and unescaped backslashes inside strings also break parsers. Newlines inside a string value must be written as \n, tabs as \t, and literal backslashes as \\.
JSON stands for JavaScript Object Notation. It is a lightweight text format for representing structured data as key-value pairs, arrays, strings, numbers, booleans, and null values. JSON was derived from JavaScript syntax but is now language-independent and used across virtually every programming language and platform as the standard format for APIs, configuration files, and data exchange.
The most common causes are trailing commas after the last element in an array or object, single-quoted strings (JSON requires double quotes), unquoted or improperly quoted keys, missing commas between items, mismatched braces or brackets, and control characters inside string values. This tool shows the exact error message from the parser so you can locate and fix the issue quickly.
No. All formatting, validation, and minification runs entirely in your browser using JavaScript. Your JSON data is never sent to a server, logged, or stored anywhere. You can safely use this tool with sensitive payloads, API keys, or internal data structures.
Formatting (or beautifying) adds indentation and line breaks to make the JSON easy for humans to read and navigate. Minifying does the opposite: it removes all whitespace to produce the smallest possible representation, which reduces file size and speeds up data transmission over a network. Use formatted JSON for debugging and development, and minified JSON for production API calls and config values.
Yes. Because all processing happens in your browser, there is no server upload limit. Very large files (tens of megabytes) may take a moment to format depending on your device, but the tool handles them without any size restriction. For extremely large files, the Minify option is useful for compressing before transmission.
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