JSON Formatter

How To Use The JSON Formatter

Paste or type JSON into the input box, then press Format to indent it with clean two-space nesting, or Minify to strip every space and line break into a single compact line. The Copy button puts the result on your clipboard. If the text is not valid JSON, the status line tells you that parsing failed, so you can find and fix the problem before you use the data.

What Formatting, Validating, And Minifying Do

JSON (JavaScript Object Notation) is the standard format for API responses, configuration files, and data exchanged between services. Formatting (also called beautifying or pretty-printing) adds consistent indentation and line breaks so deeply nested objects and arrays become readable at a glance. Validating parses the text against the JSON specification and reports the first place it breaks. Minifying does the opposite of formatting: it removes every optional space and newline to shrink the payload, which saves bandwidth in production and space in storage.

Common JSON Errors And How To Fix Them

Most "invalid JSON" messages come from a handful of mistakes. JSON is stricter than a JavaScript object literal, so the rules below catch the great majority of parsing failures.

JSON keys must use double quotes, never single quotes, and the format allows neither comments nor trailing commas.

Worked Example: Minified Vs Formatted

A minified API response such as {"user":{"id":7,"roles":["admin","editor"]}} is compact but hard to scan. Formatting it expands each key onto its own indented line, so the structure of the user object and the roles array is obvious. When you finish reading or editing, minify it again before sending it back to the server so the payload stays small.

Why This Tool Is Useful

Reading raw API output, debugging a broken config file, or comparing two payloads is far easier when the JSON is properly indented. The formatter turns a single unreadable line into a clear tree, points to the spot where invalid JSON fails, and lets you switch back to a minified form for production, all without installing an editor extension or pasting sensitive data into an unknown server.

Accuracy And Privacy

Everything runs locally in your browser using the same JSON parser the browser uses, so the validation matches what your code will see, and nothing you paste is ever uploaded or stored. If validation fails, check for the issues in the table above: missing commas, trailing commas, single or unquoted keys, comments, or mismatched brackets are the usual causes.