JSON Validator

How to use this tool

1. Paste data or code.
2. Run the tool.
3. Copy the result.

About JSON Validator

Paste data, run the tool, then copy the result.

Using JSON Validator with the right inputs

Use JSON Validator locally in your browser. Start by matching your task to the quantities and options shown below. The definitions of the inputs matter as much as the final number or transformed output; retain the original values so that you can repeat or check the result.

Inputs and options explained

• JSON input: paste the source text without omitting meaningful spaces, quotation marks or line breaks. Begin with a small representative sample so that you can check the transformation before processing a longer input.
• Or choose a JSON file (up to 5 MB): choose a local source file and keep the original. The file selector accepts .json, application/json. Check that the file contents match the intended format; renaming an extension does not convert a file.
• Action: choose Format · 2 spaces, Format · 4 spaces, Minify, Validate, Sort object keys recursively.

Method and interpretation

Validation attempts to parse the input as JSON. JSON uses quoted object keys and string values, and does not support comments or trailing commas. A successful parse establishes syntax validity for the parser, not suitability for a particular application.

Worked example

{"active":true,"count":2} is valid JSON. {active:true} is not, because the property name must be quoted. Removing a trailing comma can fix syntax, but it does not check the meaning of the data.

Assumptions and limitations

The tool does not enforce an external JSON Schema. Numeric precision and duplicate object keys need separate attention when passing data between systems. Keep a copy of the original when using formatting actions because re-serialization can change its textual representation.

Before you use the output

• Choose the intended action: Process JSON. Re-run the operation after changing an input or mode so that you are checking the updated result.
• Read the result label and any accompanying explanation. Keep the input values or source file with the output so that a later comparison uses the same assumptions.
• If a result looks unexpected, check units, separators and selected options first. Try a smaller example you can verify rather than repeatedly changing several settings at once.

Reference for further reading

RFC 8259: The JSON data interchange format. This reference explains the underlying topic; it does not certify this tool.

Questions or a result that needs checking?

If you find a discrepancy, report a problem with JSON Validator. Include a non-sensitive example, the selected options, the result you expected and the result shown. This makes the issue easier to reproduce. See About & privacy for how the site handles tool inputs.