JSON Formatter & Beautifier
Format and beautify JSON online with customizable indentation, key sorting, and instant syntax validation. 100% private browser-based formatting.
How to Use JSON Formatter Online
Follow these quick steps to process your data online directly in your browser with zero latency and 100% privacy.
Example Input & Output
The formatter parses compact JSON text, validates RFC 8259 compliance, indents nested objects and arrays with clean 2-space or 4-space formatting, and optionally sorts object keys alphabetically.
{"name":"Alex","role":"Developer","skills":["TypeScript","Astro","Tailwind"],"settings":{"active":true,"theme":"dark"}}{
"name": "Alex",
"role": "Developer",
"settings": {
"active": true,
"theme": "dark"
},
"skills": [
"TypeScript",
"Astro",
"Tailwind"
]
}Common Use Cases
API Response Debugging
Inspect compacted JSON payloads from REST APIs, GraphQL endpoints, or microservices in clean human-readable structure.
Log Inspection
Format dense, single-line JSON log entries from CloudWatch, Datadog, or Elasticsearch into readable objects.
Database Records Inspection
Beautify raw document dumps from MongoDB or PostgreSQL JSONB columns.
Specifications & Gotchas
Trailing Commas
Standard JSON (RFC 8259) strictly forbids trailing commas after the last array item or object property.
Single Quotes
Keys and string values must use double quotes ("key": "value"), not single quotes.
Unquoted Keys
JavaScript object literal syntax ({key: 123}) is invalid in standard JSON.
Frequently Asked Questions
How do I format JSON online?
Paste your unformatted or minified JSON into the editor, select your preferred indentation (2 spaces, 4 spaces, or tabs), and the beautified output appears instantly.
What is JSON beautification?
JSON beautification (or pretty printing) transforms compact, single-line JSON text into an indented hierarchical structure with consistent newlines for effortless human readability.
How do I pretty print JSON?
Paste your payload into the input pane; the formatter automatically applies standard indentation and highlights syntax in real time.
Can I format invalid or malformed JSON?
No, the formatter requires valid JSON grammar. If your input has syntax errors, line-by-line diagnostics will pinpoint the exact token to fix.
Is my JSON sent to an external server?
No. 100% of formatting, sorting, and linting occurs directly inside your web browser using client-side JavaScript.
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