JSON Formatter & Validator
CoreFormat, indent, validate and inspect JSON with syntax error location and tree view.
About JSON Formatter & Validator
A JSON formatter is an essential developer tool that organizes unformatted or minified JSON data into an indented, human-readable structure with consistent line breaks and syntax coloring. It highlights syntax errors with exact line and column numbers, allowing developers to debug API responses, inspect complex configurations, and clean payloads instantly.
Zero-Upload Privacy Guarantee
A browser-based JSON formatter executes entirely inside your browser JavaScript engine using local parsing logic. No API payloads, configuration files, authentication tokens, or sensitive production responses are ever uploaded to an external server.
Key Capabilities & Features
How to use this JSON formatter online
Paste or load JSON
Paste your raw JSON into the input editor or click 'Sample Data' to load a demonstration payload.
Select indentation
Choose between 2 spaces, 4 spaces, tab indentation, or minify/compact mode.
Inspect errors or tree view
If syntax errors exist, review the exact line and character location. Switch to 'Tree View' for nested navigation.
Copy or download
Click 'Copy' to copy the formatted output directly or 'Download' to save as a .json file.
Related Developer Utilities
Frequently paired tools in the JSON & Data workflow.
JSON Diff Checker
Compare two JSON payloads side-by-side with structural diffing and key sorting.
JSON to CSV & CSV to JSON Converter
Convert JSON arrays to CSV spreadsheets and CSV back to JSON with live table preview.
JSONPath & Schema Validator
Test JSONPath query expressions and validate JSON against JSON Schema definitions.