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JSON Formatter

Format, beautify, and validate JSON in your browser. Pretty print minified JSON, detect syntax errors, view structured output with line and column details.

jsonformatbeautifyvalidate

Formatting Options

Preview the shared config renderer across simple, choice-based, and multi-select settings.
Indent size

Set the number of spaces used for each indentation level.

Final newline

Add a trailing newline after the formatted JSON output.

Overview

Minified JSON from an API or config file is hard to read, and hunting for a missing comma in a wall of text is painful. A JSON beautifier turns that single-line blob into readable, indented output so you can quickly spot structure, nesting, and typos. Need to validate JSON before it hits your code? Paste it in, and the formatter surfaces parse errors with line and column numbers. Pretty print JSON for debugging, format JSON for sharing, or check syntax before committing—all without leaving the tab or sending data anywhere.

Features

  • Real-time Validation

    Instantly validates JSON syntax

  • Custom Formatting

    Choose your preferred indentation

  • File Upload & Download

    Work with JSON files directly

  • Privacy First

    All processing happens in your browser

Quick Tips
  • •Paste JSON from any source - APIs, config files, databases
  • •Use minify to reduce file size for production
  • •Upload .json files directly for quick formatting
  • •Download formatted JSON for easy sharing
  • •All data stays in your browser - nothing is sent to servers

When this tool helps

Practical situations where this tool is worth opening.
  • Inspecting minified API responses during backend or frontend debugging.
  • Checking whether a webhook payload is valid before replaying it.
  • Cleaning up JSON examples for tickets, documentation, or pull requests.

Common mistakes to avoid

A few easy ways these workflows go wrong in practice.
  • Editing JSON with single quotes or trailing commas copied from JavaScript objects.
  • Sharing payloads without redacting secrets, tokens, or personal data first.
  • Assuming the parser error line is the exact source of the problem rather than checking the lines above it.

Worked examples

Short examples that show what this tool is useful for.
Readable API payload
Turn a single-line payload into something you can scan quickly.

Input

{"user":{"id":42,"role":"admin"},"flags":["beta","staff"]}

Output

{
  "user": {
    "id": 42,
    "role": "admin"
  },
  "flags": [
    "beta",
    "staff"
  ]
}

Formatting keeps the data the same while making nested structure obvious.

Find a syntax issue
A missing quote or comma is easier to fix once the parser points you to the failing area.

Input

{"name":"MyDevKit","enabled":true,"tags":["json",developer"]}

Output

Parser error near the tags array because the second string is not quoted correctly.

Validate first, then edit the surrounding lines instead of guessing.

FAQ

Clarifications people often need before using the output.

Related guides

Original reading that explains the workflow around this tool.
How To Debug JSON Without Breaking Payloads
A practical guide to formatting, validating, and sharing JSON safely while debugging APIs, config files, and webhooks.

6 min read