JSON Formatter
Format, validate, prettify, and minify JSON data instantly.
What Is the JSON Formatter & Validator?
The JSON Formatter & Validator is a developer utility designed to inspect, format, validate, and minify JavaScript Object Notation (JSON) data. Raw API responses and database exports often arrive minified into a single unwieldy line or contain syntax errors that cause software parsers to crash.
Toolora's JSON Formatter executes 100% locally inside your web browser. Proprietary customer payloads, API tokens, and confidential database records are never transmitted over the internet or logged on remote servers.
Key Capabilities
Smart Prettifying
Custom indentation options (2 spaces, 4 spaces, or 1 tab) with optional alphabetical key sorting for clean code reviews.
Precision Syntax Validation
Instantly pinpoints the exact line number, column offset, and offending character for trailing commas and syntax mistakes.
Lossless Minification
Strips all unnecessary whitespace and newlines for maximum payload compression before transmission.
How to Format or Validate JSON
- Provide your input: Paste JSON data directly, upload a
.jsonfile, or click Sample to test with example data. - Select desired formatting: Choose indentation levels (2 spaces, 4 spaces, or tab) and check Sort Keys (A-Z) if desired.
- Click "Format / Prettify": If valid, clean indentation is applied immediately. If invalid, the exact error location is displayed.
- Copy or Download: Use Copy to place results on your clipboard, or Download to save as a file.
Common JSON Errors & Fixes
1. Trailing Commas: Unlike JavaScript objects, strict JSON specifications (RFC 8259) disallow commas after the last item in arrays or objects: {"a": 1,} → {"a": 1}.
2. Single Quotes: JSON keys and strings must be enclosed in double quotes ("), not single quotes (').
3. Unquoted Keys: Keys must always be wrapped in double quotes: {name: "Toolora"} → {"name": "Toolora"}.
Frequently Asked Questions
Is it safe to format sensitive credentials or API payloads here? ↓
Yes. The validation and formatting algorithms execute purely inside your browser memory using the native JSON JavaScript engine. No data is sent to our servers.
What is the maximum JSON file size supported? ↓
Since processing is client-side, files up to 50MB-100MB format easily on modern computers without latency.
What is the difference between Minify and Prettify? ↓
Prettify introduces newlines and consistent indentation so humans can read and debug the structure. Minify strips all white space, creating the smallest possible payload for production network transfers.
Does this tool support JSON with comments? ↓
Standard JSON (RFC 8259) does not permit comments. If your JSON includes C-style comments (// or /* */), remove them before formatting.