JSON Formatter & Validator
Pretty-print messy JSON, minify it for transport, or just validate that it parses. Switch modes with one click. Copy or download the result instantly.
Input
JSON, TXT
Output
JSON
Max size
10MB
Files
1 at a time
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JSON to CSV
Paste JSON or upload a file. Headers are detected from your object keys, nested values are flattened with dot notation, and the CSV downloads instantly.
CSV to JSON
Upload or paste CSV data. The first row becomes object keys; each subsequent row becomes an object. Download as a clean JSON array.
File Type Checker
File extensions can lie. This tool reads the file's first bytes (the magic number) and reports the real format — useful for security checks, recovered files, and mystery downloads.
Compress Image
Shrink images for the web, email, or storage. Smart compression and optional resizing reduce file size dramatically while keeping the result visually clean.
Frequently Asked Questions
What does Format do?
It parses your JSON and re-serializes it with your chosen indent (2 spaces, 4 spaces, or tabs) so it's easy to read.
What does Minify do?
Strips all whitespace, producing the smallest valid JSON for transport over the network.
What does Validate do?
Just checks that your input parses as JSON. If it fails, the parser's error message is shown so you can fix it.
Is there a size limit?
Files up to 10MB are supported. Very large JSON may slow your browser.
Is my JSON uploaded?
No. Parsing and formatting happen entirely in your browser.