How to check JSON syntax ?
Nothing could be easier than finding syntax errors with JSONing:
- Paste your JSON code into the editor, or download you JSON file.
- If errors are found, the first error will be highlighted in the text and detailed in the error message.
Programming Libraries
Use libraries to validate JSON in your code:
- Python:
json.loads() - JavaScript:
JSON.parse() - PHP:
json_decode()
Modern programming languages all have a library to handle and validate JSON.
Code Editors
Tools like VS Code, Sublime Text, and Notepad++ have plugins to validate JSON syntax.
Common JSON syntax errors to avoid
| Error Type | Example | Description |
|---|---|---|
| Missing Comma | { "name": "John" "age": 30 } | Missing comma between key-value pairs. |
| Unquoted Keys | { name: "John", age: 30 } | Keys must be enclosed in double quotes. |
| Incorrect Brackets | [ { "name": "John", "age": 30 ] } | Brackets must be properly opened/closed. |
| Invalid Data Types | { "age": NaN } | JSON doesn’t allow special values like NaN. |
In JavaScript, it is possible to omit quotes around object keys when writing JavaScript objects. However, in a valid JSON file, keys and string values must always be enclosed in double quotes. While JavaScript objects look similar to JSON, the two formats have different rules. I've been caught out by this several times!
JSON Validator Online
This JSON Validator Tool help to quickly identify and fix errors in your JSON code. It allows to detect errors and highlight them within seconds.
JSON (JavaScript Object Notation) is a lightweight data format widely used for exchanging information between a server and a web application. While JSON is simple and efficient, it can sometimes be difficult to debug when errors occur, especially when the data is minified or poorly formatted.
For large JSON objects or arrays, finding syntax errors can be difficult and tedious. When a JSON file is thousands of characters long, it’s hard to spot a missing comma or quotation mark! That’s where JSON validation tools come in handy!
This online JSON checker helps you find errors and visualize them clearly, making it easier to correct and improve your JSON data.
This service is completely free and requires no registration. It’s perfect for anyone who wants to quickly find and fix JSON errors without the need for complex tools or AI interfaces.