JSON Formatter
JSON Formatter - Online JSON Beautifier
Free JSON formatter with beautify, minify, validate, sort, tree view, and syntax highlighting.
Paste JSON and click Format. Results appear on the right with optional tree view.
Modern web applications rely on JSON for REST APIs, configuration files, and data exchange between services. Raw JSON from logs or network panels is often compressed without whitespace, making it hard to spot missing commas, wrong types, or unexpected null values. A dedicated formatter saves time during integration testing and incident response.
WaiHub's JSON Formatter runs entirely in your browser. Your data never leaves your device, which matters when debugging responses that contain user information, tokens, or internal identifiers. Combined with validation, minification, tree view, and YAML conversion, it covers the full JSON workflow from inspection to production-ready output.
- Better readability with customizable indentation
- Instant JSON syntax validation with error line hints
- Minify JSON for smaller payloads
- Tree view for exploring nested structures
- YAML and XML conversion for cross-format workflows
- No data upload — privacy-first browser processing
Features
- Format JSON instantly with 2- or 4-space indent
- Validate JSON syntax and highlight error locations
- Minify JSON to remove whitespace
- Sort keys ascending or descending
- Tree view with expand/collapse controls
- Convert between JSON, YAML, and XML
- JSONPath search within documents
- Copy formatted result with one click
- Upload files up to 5 MB
- Works locally in browser — no server upload
How To Use
Paste your JSON content
Copy JSON from an API response, log file, or configuration into the source panel on the left. You can also upload a .json file or paste YAML/XML for conversion.
Click Format
Press the Format button to beautify your JSON with proper indentation. Use Minify to compress, or Validate to check syntax without changing layout.
Review the formatted result
The result panel on the right shows the output. Switch to tree view to explore nested objects, or use JSONPath to search for specific keys.
Copy or download the output
Click Copy to grab the formatted JSON, or Save to download as a file. Use Sync to Input to send the result back to the source panel for further edits.
Examples
Basic formatting
Input
{"name":"John","age":18,"city":"New York"}Output
{
"name": "John",
"age": 18,
"city": "New York"
}Nested object
Input
{"user":{"name":"Alice","roles":["admin","editor"]},"active":true}Output
{
"user": {
"name": "Alice",
"roles": ["admin", "editor"]
},
"active": true
}FAQ
- Is this JSON formatter free?
- Yes. WaiHub JSON Formatter is completely free with no signup, no usage limits, and no hidden fees.
- Is my data uploaded to your servers?
- No. All processing occurs entirely in your browser. JSON is parsed and formatted locally using JavaScript — nothing is sent to WaiHub servers.
- Is there a file size limit?
- Files up to 5 MB are supported. Larger inputs pause real-time analysis to keep the browser responsive.
- Can I use this on mobile?
- Yes. The tool works on modern mobile browsers including Chrome, Safari, and Firefox on iOS and Android.
- Can I use it commercially?
- Yes. You may use WaiHub tools for personal and commercial development work without restriction.
- Will Unicode or Chinese characters break after formatting?
- No. UTF-8 encoding is handled correctly. Chinese, emoji, and other Unicode characters remain intact after formatting.