JSON Parser Guide
Learn how to parse, validate, and fix common JSON errors
Quick Start
- Paste or Upload: Copy your JSON data into the left editor, or click "Upload" to load a .json file
- Parse: Click the "Parse" button or press Ctrl+Enter
- View Results: See the tree structure on the right side
- Format/Minify: Use "Format" to beautify or "Minify" to compress
How to Parse JSON
JSON (JavaScript Object Notation) is a lightweight data format. Parsing means converting JSON text into a structured format your program can understand.
Valid JSON Example
{
"name": "John Doe",
"age": 30,
"isActive": true,
"tags": ["developer", "designer"],
"address": {
"city": "New York",
"country": "USA"
}
}Key Rules:
- Keys must be in double quotes
- Strings use double quotes, not single
- No trailing commas after last item
- Booleans:
true/false(lowercase) - Null value:
null(lowercase)
Fix Common JSON Errors
Incorrect
{
"name": "Alice",
"age": 25, ← Extra comma
}Error: Unexpected token '}' in JSON at position 29
Correct
{
"name": "Alice",
"age": 25 ← No comma
}Fix: Remove the comma after the last property
Incorrect
{
'name': 'Bob'
}Error: Unexpected token ' in JSON
Correct
{
"name": "Bob"
}Fix: Use double quotes for keys and string values
Incorrect
{
username: "charlie",
isAdmin: true
}Error: Unexpected token u in JSON
Correct
{
"username": "charlie",
"isAdmin": true
}Fix: Wrap all keys in double quotes
Incorrect
{
// This is a comment
"name": "David"
}Error: JSON does not support comments
Correct
{
"_comment": "Use a key for notes",
"name": "David"
}Fix: Remove comments or use a special key like "_comment"
Incorrect
{
"price": $19.99,
"quantity": 05
}Error: Numbers can't have prefixes or leading zeros
Correct
{
"price": 19.99,
"quantity": 5
}Fix: Use plain numbers without symbols or leading zeros
JSON Validator vs Linter
JSON Validator
What it does:
- Checks if JSON is syntactically correct
- Ensures proper structure (brackets, quotes, commas)
- Reports parsing errors with line numbers
Example Error:
Unexpected token '}' at line 5Use when: You need to verify basic JSON syntax
JSON Linter
What it does:
- Checks for code quality and best practices
- Warns about duplicate keys
- Suggests improvements (consistent indentation, key order)
Example Warning:
Warning: Duplicate key "id" foundUse when: You want to improve JSON quality beyond syntax
Our Tool Does Both!
JSON Parser validates syntax automatically and provides a tree view to visually inspect structure. The "Auto-Fix" feature acts like a linter by correcting common issues.
Feature Guide
| Feature | Shortcut | Description |
|---|---|---|
| Parse | Ctrl+Enter | Validates and displays JSON in tree view |
| Format | Ctrl+F | Beautifies JSON with proper indentation |
| Minify | - | Compresses JSON to single line (removes whitespace) |
| Copy | - | Copies JSON to clipboard (shows notification) |
| Download | Ctrl+S | Saves JSON as .json file |
| Upload | - | Loads JSON from file (max 10MB) |
| Auto-Fix | - | Automatically fixes common JSON errors |
| Share | - | Generates shareable URL (data encoded in URL) |
| Convert | - | Converts JSON ↔ XML or JSON → CSV |
Tips & Best Practices
Do
- Use consistent indentation (2 or 4 spaces)
- Keep keys descriptive and camelCase
- Validate JSON before sending to APIs
- Use tree view to inspect nested structures
- Test with sample data before real data
Don't
- Don't share URLs with sensitive data
- Don't use single quotes for strings
- Don't add trailing commas
- Don't use comments in JSON
- Don't upload files over 10MB