JSONLint - JSON Validator

My go-to tool for validating and formatting JSON data with clear, actionable error messages.

Why JSONLint is Essential for Developers

After years of debugging API responses, configuration files, and data structures, JSONLint has become my most trusted JSON tool. Here's why it's indispensable for any developer working with JSON data.

What Makes JSONLint Special:

Precise Error Location: Points exactly where syntax errors occur, not just "line 1"
Clear Error Messages: Explains what's wrong in plain English
Beautiful Formatting: Transforms minified JSON into readable format
No Installation Needed: Works instantly in any browser

Perfect For:

• Debugging API responses
• Validating configuration files
• Formatting minified JSON
• Teaching JSON syntax
• Quick syntax checks
• Data structure visualization

How I Use JSONLint in My Daily Workflow

1. API Development & Testing

When building REST APIs, I constantly copy response payloads into JSONLint to:

• Verify response structure
• Format for documentation
• Debug nested object issues
• Validate before sending to frontend

2. Configuration Management

For package.json, tsconfig.json, and other config files:

• Catch syntax errors before commit
• Format for better readability
• Validate complex configurations
• Share formatted configs with team

Pro Tip:

I bookmark JSONLint and use it as a quick sanity check before deploying any JSON-based configuration. It's saved me from countless deployment failures caused by missing commas or brackets.

Quick Usage Guide

Basic Steps:

1. Visit jsonlint.com
2. Paste your JSON data into the text area
3. Click "Validate JSON" button
4. Review results and fix any errors
5. Copy the formatted, valid JSON

✅ Valid JSON Result:

• Green "Valid JSON" message
• Beautifully formatted output
• Proper indentation
• Easy to copy and use

❌ Invalid JSON Result:

• Red error message
• Exact line and column number
• Description of the problem
• Suggestions for fixes

Why JSONLint Over Alternatives?

I've tried many JSON validators, but JSONLint consistently delivers the best experience

JSONLint ✅

• Clear error messages
• Perfect formatting
• Fast and reliable
• No ads or distractions

IDE Extensions ⚠️

• Sometimes slow
• Varies by editor
• Limited formatting options
• Not always available

Command Line Tools ❌

• Requires installation
• Less user-friendly
• No visual formatting
• Harder to share results

Try JSONLint Now

Free, fast, and reliable JSON validation in your browser