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JSON Formatter

FreePrivateInstant

Paste any JSON below — format it, catch syntax errors, or minify for production. Everything runs in your browser.

  • Beautify messy JSON
  • Validate syntax
  • Minify instantly
  • Runs locally in your browser
Input
Output
Ctrl+Enter Format  ·  Ctrl+Shift+M Minify

JSON Formatter, Beautifier & Validator Online

One workspace for the whole JSON lifecycle: paste a blob, validate with line and column errors, switch indentation, minify for production, sort keys for stable diffs, then copy or download. If you only need a single mode, the site also exposes dedicated beautifier, validator, minifier, and pretty-print pages. Nothing leaves your browser.

Where Is This Useful?

Reading API responses
Minified API responses are unreadable in DevTools. Paste the raw body here and format it to a readable structure before debugging. If the response fails to format, the validator will show you line and column for the first error.
Preparing JSON for storage
Minify before storing in a database, embedding in a bundle, or checking into source control where file size matters. The minify output shows exact byte savings so you know the impact before committing.
Reviewing and diffing JSON
Pretty-print two payloads, then paste them into JSON Diff to see exactly what changed between versions, API responses, or config snapshots.

How to Use

  1. Paste JSON into the Input panel (or click "Try sample")
  2. Pick indentation: 2-space, 4-space, or Tab
  3. Click Format to beautify, or Minify to compress
  4. Copy the output or download as .json

Example

Input (minified)
{"name":"Alice","age":30,"hobbies":["reading","coding"]}
Output (formatted)
{
  "name": "Alice",
  "age": 30,
  "hobbies": [
    "reading",
    "coding"
  ]
}

Common JSON Errors & Fixes

Missing comma
{ "a": 1 "b": 2 }
→ Fix
{ "a": 1, "b": 2 }
Trailing comma
{ "a": 1, "b": 2, }
→ Fix
{ "a": 1, "b": 2 }
Unquoted keys
{ name: "Alice" }
→ Fix
{ "name": "Alice" }
Single quotes
{ 'name': 'Alice' }
→ Fix
{ "name": "Alice" }

Features

  • Pretty-print with 2-space, 4-space, or tab indentation
  • Minify with exact byte-saving stats
  • Validate with precise error location (line + column)
  • Download formatted JSON as a .json file
  • Share via URL. JSON pre-loaded from the hash
  • Live character & line count in the editor

Frequently Asked Questions

What is the best way to format JSON online?

Paste your raw JSON into this formatter and click Format to get clean, readable JSON with proper indentation and line breaks. Everything runs locally in your browser—no upload required.

Why is my JSON not formatting correctly?

JSON usually fails to format when it contains syntax errors such as trailing commas, missing quotes, missing commas, smart quotes, or invalid escape characters. Use the JSON Validator to see exact line and column errors, then JSON Repair or Fix Invalid JSON to correct common issues before formatting again.

Does formatting JSON change the actual data?

No. Formatting only changes whitespace, indentation, and line breaks. Keys, values, arrays, and object structure remain exactly the same.

What is the difference between JSON Formatter and JSON Minifier?

A formatter makes JSON easier to read for humans by adding indentation and line breaks. A JSON Minifier removes extra spaces and line breaks to reduce file size for transfer or storage. Neither changes the underlying values.

Can I format large JSON files in the browser?

Yes. Large files can be formatted locally in your browser. Practical limits depend on device memory and browser performance.

Is my JSON uploaded to a server?

No. All formatting happens locally in your browser. Your JSON is not uploaded to a backend.

How do I compare two formatted JSON files?

Use the JSON Diff tool to open two JSON documents side by side and find added, removed, or changed values with clear highlighting.

Can I convert formatted JSON into CSV, YAML, or TypeScript?

Yes. After formatting, use JSON to CSV, JSON to YAML, or JSON to TypeScript—each runs in your browser the same way.

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