⚡ Instant Tools
Processed locally · No upload · No signup

JSON Formatter & Validator

Format, minify, validate, query with JSONPath, and convert to CSV, YAML, or TOML

Syntax highlighting, upload/download, search the tree. All in your browser.

Comparing two JSON configs? Format both sides here, then use Text Diff with Semantic JSON enabled so key order alone does not show as a change.

Input JSON

1 lines • 0 chars • 0.00 KB

Output

Output will appear here

Quick Examples

Free Online JSON Formatter & Validator

Format, validate, minify, query, and convert JSON in your browser. Use it for API payloads, config files, and other JSON you need to read or convert.

Features

  • Format/Prettify JSON: convert minified JSON to readable format
  • Minify JSON: compress JSON for production use
  • Validate JSON: check syntax and find errors
  • JSONPath query bar: pull out specific values without scrolling a huge tree
  • Convert to CSV, YAML, or TOML
  • Parsing runs in a background thread, so large files do not freeze the tab
  • Real syntax highlighting via Prism
  • Collapsible tree view with key/value search
  • Upload .json files and download formatted output
  • Customizable indentation (2, 4, or 8 spaces)
  • Runs entirely in your browser
  • Error messages with line numbers

How to Use

  1. Paste your JSON into the input area
  2. Click "Format" to beautify, "Minify" to compress, or "Validate" to check syntax
  3. Review the output and copy to clipboard
  4. Use the examples for quick testing

Common Use Cases

  • Format API responses for better readability
  • Validate JSON configuration files
  • Minify JSON data to reduce file size
  • Debug JSON syntax errors
  • Pull one value out of a huge API response with a JSONPath query
  • Turn a JSON export into a CSV for a spreadsheet, or YAML/TOML for a config file
  • Share formatted JSON with team members

Quick Start Guide

  1. 1Paste your JSON code into the input textarea above
  2. 2Select your preferred indent size (2, 4, or 8 spaces) from the dropdown
  3. 3Click 'Format' to beautify, 'Minify' to compress, or 'Validate' to check syntax
  4. 4Review the formatted output or validation result
  5. 5Run a JSONPath query to pull out specific values, or convert to CSV, YAML, or TOML
  6. 6Click the 'Copy' button to copy the result to your clipboard
  7. 7Use the example buttons below for quick testing and learning

JSON Examples

Simple Object

{"name":"John","age":30,"city":"New York"}

A basic JSON object with string and number values

Nested Object

{"user":{"name":"Alice","profile":{"email":"alice@example.com","verified":true}}}

JSON with nested objects showing hierarchical data structure

Array with Objects

[{"id":1,"title":"Task 1"},{"id":2,"title":"Task 2"}]

An array containing multiple JSON objects

Related Tools

OpenAPI to MCP

Turn OpenAPI specs into MCP servers

AI Content Detector

Detect AI-generated text

Base64 Encoder/Decoder

Encode and decode text and files to Base64

URL Encoder/Decoder

Percent-encode a JSON value for a query string, or decode it back

Hash Generator

Generate MD5, SHA-1, SHA-256 hashes

UUID Generator

Generate unique identifiers (UUIDs)

Frequently Asked Questions

What is a JSON formatter?

A JSON formatter takes compact or messy JSON and adds indentation and line breaks so you can read and debug it.

Is this JSON formatter free to use?

Yes. There is no signup and no usage limit. Processing runs in your browser, so the data stays on your device.

Can I validate JSON with this tool?

Yes. Use the Validate button to check syntax. Invalid JSON returns a clear error message with the problem location when the parser can report it.

What's the difference between formatting and minifying JSON?

Formatting adds indentation and line breaks for reading. Minifying removes whitespace to shrink the payload for production or transfer.

What is the JSONPath query bar for?

It lets you pull specific values out of a large JSON document without scrolling through the tree. Supports property access ($.a.b), array indexing ($.items[0], including negative indices), wildcards ($.items[*]), and recursive descent ($..id finds every "id" key at any depth). Filter expressions like [?(@.age>18)] are not supported.

Can I convert JSON to CSV, YAML, or TOML?

Yes. Format or validate your JSON first, then use the Convert to buttons. CSV works best for an array of objects (nested objects are flattened with dot-notation column names). YAML and TOML support the full JSON structure, though TOML has no null type, so null values are omitted with a comment noting which keys were skipped.

Will a large JSON file freeze my browser tab?

Parsing runs in a Web Worker, so the tab stays responsive while a large file loads. This is not a streaming parser: the full document still needs to fit in browser memory to format or show as a tree.

Is my JSON data secure?

Yes. Formatting, validation, and conversion run in your browser with JavaScript. JSON is not uploaded to a server.