JSON Formatter, Validator & Converter
Format, validate, and minify JSON with syntax highlighting. Convert to CSV, YAML, or TypeScript interfaces. Runs entirely in your browser.
{
-700">"name": -700">"WRRK Tools",
-700">"tools": [
{
-700">"slug": -700">"qr-code-generator",
-700">"live": -700">true
},
{
-700">"slug": -700">"image-compressor",
-700">"live": -700">true
}
],
-700">"users": 1234567
}About this tool
WRRK's JSON formatter is a fast, browser-only tool for formatting, validating, beautifying, minifying, and converting JSON. Paste raw JSON, get clean indented output with syntax highlighting (strings, numbers, booleans, null, and keys all colored differently). If the JSON is invalid, you get the exact position where the parser failed plus a human-readable explanation.
Beyond format/minify, the tool can convert JSON to three other formats: CSV (flattens arrays of objects, useful for spreadsheet imports), YAML (cleaner config files), and TypeScript interfaces(auto-generated types from your API response). Everything runs locally — your JSON never leaves your browser, which matters when you're debugging API responses with auth tokens, customer data, or production payloads.
How to format JSON (5 steps)
- Paste your JSON. Drop or paste any JSON into the left input panel. Click 'Sample' to load an example.
- Pick output mode. Format (pretty), Minify (compact), or convert to CSV / YAML / TypeScript interfaces.
- Set indent (for Format). Choose 2 spaces, 4 spaces, or tab. Default is 2 spaces.
- Read errors. If JSON is invalid, the right panel shows the exact error and approximate character position.
- Copy or download. Click Copy to put the output in your clipboard, or Download to save as a file with the right extension.
Use cases
- Reading API responses pasted from Postman or curl
- Debugging JSON config files (package.json, tsconfig.json, etc.)
- Validating webhook payloads before sending them
- Generating TypeScript types from API responses
- Converting JSON arrays to CSV for spreadsheet imports
- Minifying JSON for embedding in HTML data attributes
- Inspecting JWT payload contents (the middle part is JSON)
Frequently asked questions
+−How do I format JSON online for free?
Paste your JSON into the input panel — formatted output appears instantly with syntax highlighting. Pick indent size (2 spaces, 4 spaces, or tab). Free, no signup, no character limit.
+−What's the difference between formatting and minifying JSON?
Formatting (beautifying) adds indentation and line breaks for readability. Minifying strips all whitespace to make the file as small as possible — useful for config files and API payloads where size matters.
+−How do I validate if JSON is valid?
Paste it into the formatter — if it's invalid, you'll see a red error showing the position where parsing failed plus a description like 'expected comma' or 'unterminated string.'
+−Can I convert JSON to CSV, YAML, or TypeScript?
Yes. Switch the output tab to 'JSON → CSV', 'JSON → YAML', or 'JSON → TypeScript'. The tool flattens nested objects for CSV, preserves structure for YAML, and generates TypeScript interfaces from arrays of objects.
+−Why does my JSON have an 'Unexpected token' error?
Common causes: trailing comma after the last item, single quotes instead of double quotes, unescaped quotes in strings, or missing closing brackets. The error position tells you exactly where to look.
+−Is my JSON data sent to a server?
No. The formatter runs entirely in your browser — your data never leaves your device. Safe for debugging payloads with API keys, tokens, or sensitive customer data.
+−How do I minify JSON for production?
Click the 'Minify' tab. The output is a single-line compact version with all whitespace removed. Click 'Copy' or 'Download' to grab it.
Related on WRRK Tools
Days between dates, age, add/subtract
ToolLength, mass, temperature, area, volume, time, speed
ToolHEX, RGB, HSL, HSV, CMYK + Tailwind class
CategoryBrowse the full developer tools category
ArticleJSON formatting is essential for debugging and readability. Discover how to format JSON online quickly using free tools and best practices.
CompareHonest comparison: features, pricing, signup