JSON Formatter & Validator
How to use the JSON Formatter
Paste your JSON into the input box above and click "Format JSON". It will be automatically validated and formatted with proper indentation. If there are syntax errors, the tool will notify you. It works entirely in your browser — zero data is ever sent to any existing server. Ideal for debugging API responses or making raw JSON payloads human-readable.
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JSON Formatter & Validator Guide & Best Practices
How to Use
Paste your raw, minified, or malformed JSON into the input area. The tool will instantly parse, beautify, and highlight the syntax. If there are syntax errors, it will pinpoint the exact line and character causing the issue.
Technical Deep-Dive: JSON Schema Validation
JSON (JavaScript Object Notation) is the standard data-interchange format for modern REST and GraphQL APIs. Proper JSON must use double quotes for keys and string values, and cannot contain trailing commas. JSON Schema validation takes this a step further by defining the expected structure, data types, and required fields of a JSON payload. This client-side formatter uses the native JSON.parse() wrapped in robust try-catch blocks to ensure that structural integrity is maintained before applying custom recursive formatting algorithms to indent and highlight the payload.
FAQ
- Can it handle large JSON files? Yes, our highly optimized DOM rendering can handle payloads up to several megabytes without freezing the browser.
- Are trailing commas supported? By default, trailing commas are invalid in strict JSON, but our parser can identify and warn you about them.