JSON Formatter
Validate, format, and minify JSON data.
Format, validate, and minify JSON data with syntax highlighting. Perfect for debugging APIs and cleaning up JSON responses.
What is This Tool?
A JSON formatter and validator pretty-prints, minifies, validates, and transforms JSON data. Paste raw JSON to instantly format with proper indentation, detect syntax errors with precise line/column locations, and navigate complex nested structures with an interactive tree view.
JSON (JavaScript Object Notation) is the universal data interchange format for web APIs. Valid JSON requires double-quoted strings, no trailing commas, no comments, and no undefined values. This tool catches these common errors and formats output with configurable indentation.
Common Use Cases
API Development
Format API responses for readability, validate request payloads, and debug malformed JSON in REST and GraphQL APIs.
Config File Editing
Validate and format JSON configuration files (package.json, tsconfig.json, .eslintrc) to catch syntax errors before deployment.
Data Debugging
Navigate large JSON objects with tree view, search for keys, and extract nested values for debugging.
JSON Minification
Minify JSON by removing whitespace to reduce payload size for network transmission and storage.
Frequently Asked Questions
What JSON errors are detected?
Missing/extra commas, unquoted keys, single-quoted strings, trailing commas, comments, undefined/NaN values, and unmatched brackets/braces.
Can I sort keys alphabetically?
Yes. Sort object keys alphabetically for consistent formatting, easier diffing, and standardized output.
Is JSON5 or JSONC supported?
This tool validates strict JSON per RFC 8259. JSON5 features (comments, trailing commas, unquoted keys) will be flagged as errors.