JSON Formatter
Validate, pretty-print, or minify JSON online for free with 2 spaces, 4 spaces, or tabs. Your data stays in your browser.
Free JSON and CSV Tools
Validate and format JSON or convert data between JSON and CSV. Choose the free tool that matches your task and work directly in your browser.
Free without an account. Input and results are not sent to or stored on a server.
Format and validate JSON
JSON Formatter
Convert between JSON and CSV
JSON to CSV
Convert a JSON object or array to CSV online free. Keep Unicode and nested values, then copy or download without uploading data.
CSV to JSON
Convert CSV to a JSON array online free. Handle quoted commas and line breaks in your browser without uploading the file.
Choosing a data tool
1Should I format JSON or convert it to CSV?
Use JSON formatting to keep JSON while indenting, validating syntax or removing whitespace. Use JSON to CSV for an object or array of objects as a table, and CSV to JSON to use first-row column names as keys.
2Are the original value types preserved?
CSV to JSON keeps values as strings. JSON to CSV stores nested objects and arrays as JSON text in a cell, and null or missing values as empty cells. A round trip does not fully restore the original structure or types.
3Can I process large files for free?
Processing is free and local, but each tool currently accepts input up to 5 MB. Very large integers may be rounded by JavaScript number handling. Keep exact identifiers as strings and review the result.