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JSON Validator
This tool allows you to validate your JSON code and identify any syntax or formatting errors that may need to be corrected. Because JSON follows a strict structure, even minor issues—such as missing commas, incorrect brackets, invalid quotes, or improperly formatted values—can cause the entire file to fail when being parsed.
When your JSON contains errors, applications, APIs, or scripts that rely on it may be unable to read or extract the required data, resulting in broken functionality or unexpected behavior. Validating your JSON beforehand helps ensure that your data is correctly structured, consistent, and ready for use.
To use the tool, simply paste your JSON code into the input area below and click “Validate Code”. The validator will analyze your code and display clear, easy-to-understand error messages, making it quick and simple to locate and fix any issues.
JSON code
Results
Your JSON is checked in your browser and nothing is uploaded.
How to use it
The json validator is a handy tool that will let you know if there are errors in your json files.
- Add your JSONCopy and paste your json code into the editor above, or use Open file to load a
.jsonfile. - ValidateThe code is checked as you type. You can also click Validate code, or press Ctrl+Enter, to check it straight away.
- Find the problemIf there are any errors, this tool tells you the line and column, marks the line in the editor and shows the lines around it. Use Go to line to jump there.
- Fix and check againAny errors in your json file should be fixed for it to work correctly. Only the first error is shown, so once it is fixed the next one, if there is one, appears.
Good to know
Double quotes only
Keys and text values must be in straight double quotes. Single quotes, curly quotes and unquoted keys are not valid JSON.
No trailing commas
A comma goes between items, never after the last one. Comments are not allowed either.
Repeated keys
An object with the same key twice is still valid JSON, but most programs keep only the last one. The result lists any repeated keys so you can check them.
Frequently asked questions
What counts as valid JSON?
The rules in RFC 8259. A document is one value: an object {}, a list [], a string, a number, true, false or null. This is stricter than a JavaScript object, so JavaScript-only things such as comments, single quotes or undefined are reported as errors.
Why does it say there is extra text after the end?
A JSON document holds a single value. Two objects one after the other, as in a JSON Lines file, are not one valid document. Check each line on its own, or wrap them in a list with commas between them.
Why is my number rejected?
JSON numbers cannot have leading zeros (07), a leading plus or decimal point (+1, .5), a trailing decimal point (1.) or be written in hex. NaN and Infinity are not allowed either.
Does this check my data against a schema?
No. It checks that the text is valid JSON. It does not check that the keys or values are the ones a particular program expects.
Is my JSON uploaded?
No. The checking is done in your browser and nothing is sent anywhere.
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