Tool
JSON Formatter — Pretty
Prettify adds indentation for readable debugging and code review.
- Free online
- No signup
- Instant
- Browser-based
Free JSON formatter and validator — prettify, minify, and check syntax online. No upload.
Other presets
Switch angle without leaving JSON Formatter—each URL has unique copy and defaults.
Prettify with indentation, tree view, or compare two JSON documents.
Your workspace
History, share link, and export — saved locally in your browser (0 favorites).
Use cases
- Debug API responses during frontend development.
- Minify JSON before embedding in config or scripts.
- Validate config files before deploy.
- Clean pasted logs for tickets and documentation.
How it works
Paste input or click generate. Processing stays on your device—nothing is uploaded to our servers.
Guides
Intent-focused pages—each opens a short guide and links to the matching tool preset when helpful.
For this tool
Often used next (graph neighbors)
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Developer guides
JSON, UUID, and Base64 intent pages—pair formatting and encoding tools with short how-to guides.
FAQ
Is my JSON sent to a server?
No. Parsing and formatting happen entirely in your browser.
What if JSON is invalid?
The validator and format actions show parse errors with messages to help you fix syntax.
Can I format large files?
Very large payloads may slow the tab. For huge files, use a desktop editor.
Does it support JSON5 or comments?
Standard JSON only—comments and trailing commas are not accepted.
Explore more
Includes recommendations from the tool graph plus your curated related list.