Will the tool repair invalid JSON?
No. It reports the parsing error rather than silently changing malformed input and calling it valid.
JSON Formatter & Validator
Beautify or minify JSON, identify syntax errors, and keep potentially sensitive development data in your browser.
96 / 1,000,000 characters
Output
Valid JSON is never silently repaired.
Run an action to create a current result.
JSON processing occurs entirely in your browser. Your input is not uploaded to Tool Teaze.
What this tool does
This JavaScript-based JSON utility parses input strictly, reports malformed JSON, and can output readable or compact valid JSON.
How to use it
- Paste JSON and choose 2- or 4-space indentation.
- Format, validate, or minify the input.
- Copy valid output or download it as a JSON file.
Example input and output
Input: {"active":true,"items":[1,2]}
Output: A validated and consistently indented JSON document
Common use cases
- Reading API responses
- Checking configuration files
- Reducing JSON size for transfer or storage
FAQ
How large can the input be?
Wave 1 limits input to one million characters to reduce the chance of a huge paste freezing the page.
Is JSON uploaded?
No. Parsing and output generation happen entirely in your browser.