Debugging API Responses
When integrating third-party APIs, raw JSON strings are difficult to parse. Paste your raw payload into the formatter to instantly apply indentation, highlight data types, and isolate missing commas or unescaped quotes.
Online JSON Formatter & Validator
Format, beautify, minify, and validate JSON data instantly. Identify syntax errors and download clean JSON files.
Browser-Based
Quick Answer
Format, validate, and beautify messy JSON data. Instantly spot syntax errors, collapse deep objects, and format payloads for easier debugging.
- Beautifying minified API responses
- Validating Webhook payloads
- Debugging configuration files
- Formatting JSON for documentation
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How to Use
- 1Paste your raw JSON string into the input area.
- 2Click 'Format' to beautify the JSON with indentations, or 'Minify' to compress it into a single line.
- 3If the JSON is invalid, the validator will display a clear error message with the line number.
- 4Use 'Copy' to duplicate the result or 'Download' to save it as a .json file.
Common Use Cases
- Validating malformed JSON responses from backend APIs.
- Decoding and verifying JWT payloads during authentication flows.
- Minifying CSS/JS assets manually before a quick hotfix deployment.
Features
Keeps proprietary code, tokens, and API keys strictly on your local machine.
Instant execution provides immediate feedback loops during active debugging.
Eliminates the need to install heavy IDE extensions for simple formatting tasks.
Frequently Asked Questions
Will the formatter fix my broken JSON?
It will highlight exactly which line contains the syntax error (like a trailing comma or missing bracket) but relies on you to safely correct the data.
Can I format massive multi-megabyte JSON files?
Yes, because the parsing engine runs locally, it can handle multi-megabyte payloads that would crash standard server-based formatting tools.
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