JSONHack – Common JSON Errors & Fixes

Common JSON Errors and How to Fix Them

JSON is simple, but even a small mistake can make it invalid. APIs, web apps, and mobile apps often fail because of tiny JSON errors. Below are the most common JSON issues and how to fix them quickly using a JSON validator or JSON formatter.

1. Missing or Extra Commas

One of the most common errors:

{
  "name": "John"
  "age": 25
}

Fix: Add a comma.

{
  "name": "John",
  "age": 25
}

2. Using Single Quotes Instead of Double Quotes

{'name': 'John'}

Fix: JSON only supports double quotes:

{"name": "John"}

3. Trailing Commas (Not Allowed)

{
  "name": "John",
  "age": 25,
}

Fix: Remove the last comma.

4. Missing Curly Braces or Brackets

"name": "John",
"age": 25

Fix: Wrap inside braces.

{
  "name": "John",
  "age": 25
}

5. Unquoted Keys

{name: "John"}

Fix:

{"name": "John"}

6. Invalid Characters

Special characters like tabs, invisible characters, or comments can break JSON.

How to Fix JSON Errors Instantly

Use these tools on JSONHack:

• JSON Validator – find errors instantly
• JSON Formatter – beautify and fix structure
• JSON Beautifier & Pretty Print
• Online JSON Editor

Why JSON Errors Happen

• Manual editing of API responses
• Copy-paste mistakes
• Using non-JSON-compliant formats
• Trailing commas from coding habits

Best Practices to Avoid JSON Errors

• Always validate before using JSON
• Use an online JSON formatter for long data
• Follow strict double-quote rules
• Check arrays and objects carefully

Conclusion

Most JSON errors are simple and easy to fix once you know what to look for. Using tools like JSONHack can help you format, validate, and correct JSON instantly.