Format, minify, and validate JSON. Shows detailed error messages for invalid JSON.
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Input JSON
Output
JSON Formatter is a free online tool that formats, beautifies, minifies, and validates JSON data. Paste any raw or minified JSON and get it formatted with 2-space indentation. Also minifies JSON for production use.
The tool uses JSON.parse() to validate and parse the input, then JSON.stringify() with indent parameter for formatting, or without for minification. Errors from JSON.parse are shown with the character position to help you find the issue.
Paste your JSON
Paste raw JSON text into the input editor. It can be minified, single-line, or partially malformed.
Format or minify
Click "Format" to pretty-print with indentation and syntax highlighting, or "Minify" to collapse it to a single line.
Validate
Errors are highlighted with line and column numbers so you can find and fix issues quickly.
Copy or download
Copy the formatted output to your clipboard or download it as a .json file.
Debugging API Responses
Paste raw JSON from an API call and instantly expand it into readable indented form to inspect nested fields.
Validating Config Files
Check that JSON configuration files (package.json, tsconfig.json, etc.) are syntactically correct before committing.
Minifying for Production
Collapse a pretty-printed JSON data file into a single line to reduce payload size for HTTP responses.
Fixing Broken JSON
Use the detailed error messages with character positions to locate and fix malformed JSON quickly.
Sharing Readable Data
Format raw JSON before including it in documentation, Slack messages, or GitHub issues for easy reading.
Database Record Inspection
Beautify JSON stored in database columns (like PostgreSQL JSONB) to review record structure at a glance.
Three Tools in One
Format, minify, and validate JSON with dedicated buttons so you can perform all common JSON tasks without switching tools.
Precise Error Messages
JSON.parse error output includes the exact character position and description, making malformed JSON fast to diagnose.
Instant Valid Badge
A green "Valid JSON" indicator confirms your data is well-formed without producing unnecessary output.
No Size Limit
Handles large JSON payloads directly in the browser without timeouts or file-size restrictions.
Privacy First
All processing runs client-side so sensitive data like API keys and tokens never leaves your browser.
One-Click Copy
Copy the full formatted or minified output to your clipboard instantly without selecting text manually.
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