One of 55 free AI tools built by Zalt, an AI architect and consultant with 16 years of experience.
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.
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Key Features
Privacy & Trust
Use Cases
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