All Categories9 categories · 105 tools
PDF Tools
Compress, merge, split, convert, and edit PDF files online for free.
15
Image Tools
Compress, resize, convert, and edit images without uploading to a server.
15
Text Tools
Count words, convert case, sort text, generate content, and more.
15
Developer Tools
Format JSON, encode Base64, generate UUIDs, test regex, and more.
15
Web Design Tools
Generate CSS gradients, box shadows, color palettes, and more.
10
Calculators
BMI, age, percentage, EMI, unit converters, and more free calculators.
15
Security Tools
Generate passwords, hashes, QR codes, and check password strength.
7
Misc Tools
Random numbers, dice roller, coin flip, barcode generator, and more.
9
Social Media Tools
Character counters, image resizers, hashtag tools, and more for social media.
4

JSON Validator Online Free

Validate JSON syntax with error line highlighting.

Files never uploadedInstant results100% freeWorks on mobile

How to Use

  1. 1Paste your JSON data into the text area below.
  2. 2Click the Validate button to check for syntax errors.
  3. 3View the validation result: valid or error with line number.

Frequently Asked Questions

What JSON errors are detected?

The validator detects syntax errors like missing commas, unclosed brackets, incorrect quotes, trailing commas, and invalid characters.

Does it check JSON structure?

No, it only validates JSON syntax. For schema validation, use a dedicated JSON Schema validator.

Is my data stored?

No. All validation happens in your browser. Your JSON data never leaves your device.

Related Tools

JSON Formatter
Free online tool
JSON to CSV
Free online tool
CSV to JSON
Free online tool
XML Formatter
Free online tool

User Reviews & Feedback

Real-time comments from our global community of users.

5.0out of 5
0 reviews submitted

Share your experience

No signup needed. Your feedback runs client-side and updates instantly.