JSON Validate
Validate JSON syntax.
How to use JSON Validate
JSON Validate — Check that text is valid JSON and show a formatted copy when it parses. Free to use in D2i DevTools — no account required.
Steps
- Fill in JSON. This field is required.
- Click Run and copy the result under the form.
Frequently asked questions
What is JSON Validate used for?
Use it to confirm an API body or config before you ship it. The error points at the syntax problem.
How do I use the free online JSON Validate tool?
Fill in JSON. This field is required. Click Run and copy the result under the form.
What can I paste or upload into JSON Validate?
Paste the JSON you want to check. One value only — two concatenated objects will fail.
What output does JSON Validate give me?
A success result with indented JSON when the text parses. Otherwise an error that includes the parser message.
Is JSON Validate free, and is my input private?
Yes — Your input is processed in memory for this request only. It is not saved to disk or the database, and it is cleared after the tool finishes.
Does valid JSON mean the schema is correct?
No. This checks syntax only. It does not compare fields to a JSON Schema, OpenAPI spec, or expected types beyond what JSON itself allows.
Inputs are processed in memory only and are not saved to disk or the database. Data exists only for the duration of your request.