JSON Tools

JSON Formatter

Format, beautify, and minify JSON online. Tree view, JSON to YAML/TOML conversion, syntax highlighting, and instant copy.

Your data never leaves your browser — nothing is sent to any server.

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How to use
  1. 1

    Paste your JSON

    Type or paste your JSON into the left input panel. The formatter processes input in real time — no need to click a button.

  2. 2

    Choose beautify or minify

    Use the Beautify/Minify toggle at the top. Beautify adds indentation and newlines for readability. Minify compresses everything to a single line.

  3. 3

    Adjust indentation (beautify mode)

    Select your preferred indentation: 2 spaces (default), 4 spaces, 8 spaces, or tabs. The output updates instantly.

  4. 4

    Switch output view

    Use the JSON, Tree, YAML, or TOML tabs on the output panel. Tree view lets you expand and collapse nested structures. YAML and TOML tabs convert your JSON to those formats.

  5. 5

    Copy the formatted output

    Click the copy button on the output panel to copy the formatted JSON to your clipboard. The output includes syntax highlighting for easy visual scanning.

Common errors

Input is not valid JSON

The formatter requires valid JSON input. Common issues include trailing commas, single quotes instead of double quotes, and unquoted keys. Fix the syntax errors first, then format. Use our JSON Validator for detailed error messages with line numbers.

Output looks the same as input

If your input is already formatted with the selected indentation level, the output will look identical. Try switching to a different indent size or toggle to minify mode to see the difference.

Special characters appear escaped in output

JSON.stringify escapes certain Unicode characters and control characters by design. Characters like \n, \t, and non-ASCII symbols will be escaped in the output. This is correct JSON behavior and ensures the output is valid across all parsers.

FAQ (8)
What is the difference between beautifying and minifying JSON?

Beautifying (pretty-printing) adds whitespace and indentation to make JSON human-readable. Minifying removes all unnecessary whitespace, reducing file size. Beautified JSON is ideal for debugging and documentation; minified JSON is used in production APIs and storage to save bandwidth and space.

How do I choose the right indentation level?

2-space indentation is the most common standard, used by Prettier, npm, and most JavaScript toolchains. 4-space indentation is preferred in some enterprise codebases and aligns with Python conventions. Tab indentation is useful when you want each developer to control display width independently. 8-space is rarely used but can help visualize deeply nested structures.

Does this formatter sort JSON keys?

No. This tool preserves the original key order of your JSON objects. JSON objects are technically unordered collections per the spec, but many applications depend on key order. If you need sorted keys, pre-process your JSON with a script that sorts the keys before formatting.

Can this tool handle large JSON files?

Yes. The formatter runs entirely in your browser using the native JSON.parse() and JSON.stringify() functions, which are highly optimized. It handles files up to several megabytes without issues. For very large files (10 MB+), you may experience a brief delay during parsing.

Why is the syntax highlighting different from my code editor?

This tool uses a lightweight regex-based highlighter optimized for speed. It colors keys in blue, strings in green, numbers in amber, booleans in purple, and null in rose. Your editor likely uses a full JSON grammar parser which can handle edge cases like escaped quotes differently, but for standard JSON both produce equivalent results.

Can I view JSON as a tree?

Yes. Switch to the Tree tab in the output panel to explore nested objects and arrays in a collapsible tree view. Click any node to expand or collapse its children — useful for large API responses where scrolling through formatted text is slow.

Can I convert JSON to YAML or TOML?

Yes. Use the YAML or TOML tabs in the output panel to convert valid JSON instantly. YAML output uses 2-space indentation. TOML conversion works best with flat or shallow object structures — deeply nested arrays may not convert cleanly due to TOML format limitations.

Is my JSON data sent to any server?

No. All formatting and syntax highlighting happens locally in your browser. Your data never leaves your device. There are no server requests, no logging, and no third-party analytics on your input. The page works offline once loaded.

Learn more

JSON Formatter — Beautify, Minify, and Highlight JSON Online

JSON formatting is one of the most common tasks in a developer's daily workflow. Whether you're debugging an API response, preparing configuration files for code review, or compressing payloads for production, having a fast and reliable JSON formatter saves time and reduces errors. This tool handles both beautification and minification with syntax highlighting, entirely in your browser.

Why Format JSON?

Raw JSON from APIs, databases, and log files is often minified — compressed into a single line with no whitespace. While machines parse this efficiently, humans cannot read it. Formatting adds consistent indentation and line breaks, revealing the structure of nested objects and arrays. This makes it dramatically easier to spot missing fields, incorrect nesting, type mismatches, and other data issues that would be invisible in minified form.

When to Minify JSON

Minification is the reverse operation: removing all whitespace that isn't inside string values. For a typical API response, minification can reduce payload size by 20-40%, which translates to faster network transfers and lower bandwidth costs. Configuration files stored in databases, environment variables, or key-value stores also benefit from minification since they often have size limits. Use minification for production payloads and storage, and beautification for development and debugging.

Indentation Standards Across Ecosystems

The JavaScript/TypeScript ecosystem has largely standardized on 2-space indentation for JSON. Tools like Prettier, ESLint, the npm CLI, and VS Code all default to 2 spaces. The Python ecosystem often uses 4 spaces, matching PEP 8 conventions. Some legacy Java and enterprise systems use tabs or 8 spaces. This formatter supports all four options so you can match whatever standard your project follows.

Syntax Highlighting for Rapid Scanning

This formatter applies color-coded syntax highlighting to the output. Keys are displayed in blue, string values in green, numbers in amber, booleans in purple, and null values in rose. This visual differentiation lets you scan complex JSON structures at a glance — immediately distinguishing configuration keys from their values, finding null fields, and identifying numeric vs. string types without reading each value carefully.

JSON Formatting in the Development Pipeline

Beyond manual formatting, JSON formatting matters in CI/CD pipelines and code review workflows. Inconsistent formatting in checked-in JSON files creates noisy diffs that obscure real changes. Many teams add JSON formatting to their pre-commit hooks using tools like Prettier or jq. For ad-hoc formatting during development, browser-based tools like this one provide the fastest feedback loop — paste, format, copy, and move on. No installation, no configuration, no waiting for a build step.

Tree View, YAML, and TOML Output

Beyond formatted JSON, switch to the Tree tab to explore nested structures with expand/collapse nodes — ideal for large API responses. The YAML tab converts JSON to YAML for Kubernetes manifests, GitHub Actions, and Docker Compose files. The TOML tab converts JSON to TOML for Cargo.toml, pyproject.toml, and other config formats.

Privacy and Performance

This tool runs entirely client-side using the browser's native JSON.parse() and JSON.stringify() functions. Your data never leaves your browser — no server requests, no telemetry, no data retention. The formatting operation itself is nearly instantaneous for typical payloads and handles files up to several megabytes without issues.