Free JSON Formatter
Paste raw or minified JSON and instantly format, beautify, validate, or minify it. Features line numbers, error line highlighting, JSON path display on click, configurable indentation, and one-click copy of both formatted and minified output. All processing happens locally in your browser — no signup, no server, no data sent anywhere.
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Why Use a JSON Formatter?
JSON is the universal data format for APIs, configuration files, and data exchange — but raw JSON from an API response or a minified file is nearly impossible to read. A missing comma buried in a 500-line payload can take minutes to find by hand. This free JSON formatter instantly beautifies, validates, and helps you navigate JSON data, all running locally in your browser with no data sent anywhere.
Whether you are debugging an API response, reviewing a Kubernetes config, building a webhook payload, or validating Terraform state, having a fast and private JSON tool eliminates the friction of pasting sensitive data into third-party websites. The formatter catches syntax errors the moment you click Format and highlights the exact error line, saving you from manually scanning raw text.
Features Built for Real Developer Workflows
This is not a bare-bones JSON pretty-printer. Line numbers in both the input and output make it easy to reference specific parts of your data. When validation fails, the error line is highlighted in the gutter so you can jump straight to the problem. Click any line in the formatted output to see the JSON path — useful when you need to write a jq filter, reference a field in code, or paste a path into documentation.
You can format with 2 spaces, 4 spaces, or tabs. The Minify button compresses your JSON to a single line, and Copy Minified lets you grab the compact version without losing the formatted view. File size stats show both the formatted and minified byte counts, which is helpful when you need to check whether a payload fits within an API size limit or a message queue constraint.
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How It Works
Paste or type your JSON into the input area.
Click Format to beautify or Minify to compress. Validation errors appear instantly with the exact error line highlighted.
Copy the formatted or minified output with one click. Click anywhere in the output to see the JSON path.
Key Features
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Use Cases
Frequently Asked Questions
Is this JSON formatter completely free to use?
Yes. It is 100% free with no limits on usage, no signup, and no ads. Unlike some JSON tools that restrict features behind a paywall or inject ads, this formatter gives you full access to formatting, validation, minification, line numbers, and error highlighting at zero cost because everything runs locally in your browser.
Is my JSON data sent to a server or stored anywhere?
No. Every operation — formatting, validation, minification — runs entirely inside your browser using native JSON.parse and JSON.stringify. Your JSON never leaves your device, not even temporarily. There are no API calls, no logging, and no analytics on your data. This is critical for developers working with JSON that contains API keys, user data, configuration secrets, database connection strings, or any sensitive information you would not want pasted into a third-party website.
Can this tool validate my JSON and show me where errors are?
Yes. When you click Format or Minify, the tool validates your JSON and shows a clear error message if it is invalid. It also highlights the error line number in the input gutter so you can jump straight to the problem — no more scanning through hundreds of lines to find a missing comma or unmatched bracket.
What does the JSON path feature do?
When you click anywhere in the formatted output, the tool displays the approximate JSON path (like $.users.address.city) for that location. This is helpful when you need to reference a specific field in code, documentation, or a jq command and do not want to manually trace through nested objects and arrays.
Can I minify JSON as well as beautify it?
Yes. You can minify JSON in two ways: click the Minify button to replace the output with compact single-line JSON, or use the Copy Minified button to copy a minified version to your clipboard while keeping the formatted view intact. Both are useful — the first when you need to see or edit the minified result, the second when you want to quickly grab a compact version for embedding in code or config.
How large of a JSON file can this tool handle?
The tool handles files up to about 5MB comfortably on most devices. Files between 5-10MB will work but may feel slower. Files above 10MB may cause browser performance issues depending on your hardware. For very large files, consider using VS Code or jq on the command line. For the vast majority of API responses, config files, and data exports, this tool works without any issues.
What indentation options are available?
You can choose between 2 spaces, 4 spaces, or 1 tab indentation using the dropdown next to the Format button. The default is 2 spaces, which is the most common convention for JSON. Changing the indent size and clicking Format again will reformat the output with the new setting.
What is the difference between this and formatting JSON in VS Code?
VS Code is excellent for formatting JSON files you already have open in your editor, but this tool is faster for quick one-off tasks: paste in an API response from DevTools, format a JSON string from a log, or validate a snippet from documentation. There is no need to create a file, open an editor, set the language mode, and run a format command. Paste, see the result, copy — three seconds. It is also useful on machines where you do not have VS Code installed, like a coworker's computer or a shared workstation.
Does this tool support JSON5, JSONC, or JSON with comments?
No. The tool validates and formats strict JSON as defined by RFC 8259. JSON5 features like trailing commas, single-quoted strings, and comments will be flagged as validation errors. If you work with JSONC (used in VS Code settings and tsconfig), you will need to strip comments first or use a specialized parser.
How is this different from JSONLint?
JSONLint is primarily a validator that tells you whether your JSON is valid. This tool does that plus more: it beautifies with configurable indentation, minifies, shows line numbers, highlights the exact error line, displays JSON paths on click, shows file size stats, and lets you copy formatted or minified output. Everything runs in your browser with no data sent to a server, whereas some online JSON linters process your data server-side.
Limitations
- Very large JSON files (10MB+) may slow down the browser
- Does not support JSON5 or JSONC (JSON with comments)
- Formats using native JSON.parse/stringify — no custom key sorting