JSON Validator & Formatter
Paste JSON to validate, format, or minify it. All processing runs locally in your browser — no data is uploaded.
INPUT
OUTPUT
// output will appear here
Method and assumptions
The browser's JSON.parse checks syntax. JSON.stringify formats with two-space indentation or removes optional whitespace. Syntax validation does not validate your broker's schema or execute the data.
Common mistakes and edge cases
Use double quotes, no comments and no trailing commas. Duplicate keys may be overwritten during parsing. Integers beyond JavaScript's safe-integer range can lose precision: represent large identifiers as strings. Very large files can block the browser; no file upload is performed.
How to use
- Paste JSON into the input panel.
- Choose Validate, Format, or Minify.
- Copy the output or clear to start over.
Example
Input {"symbol":"BTCUSDT","quantity":1} is valid. Formatting adds indentation; minification preserves the parsed values. {"quantity":1,} is invalid because JSON does not allow trailing commas.
Frequently asked questions
- Is my JSON uploaded?
- No. Parsing runs in your browser using the built-in JSON API.
- How large can input be?
- Practically limited by your browser's memory. Very large documents may be slow.
RELATED TOOLS
Browse the full tools directory.
This tool is provided for general informational and workflow purposes only. It does not constitute financial, investment, tax, or professional advice. All calculations run in your browser; no input data is transmitted or stored.