JSON Formatter

JSON formatting adds consistent indentation, line breaks, and spacing to make JSON data human-readable. Minified JSON ({"a":1,"b":2}) becomes properly indented. Tip: standard indentation is 2 spaces for web development and 4 spaces for Python-related projects.

JSON5 extends JSON with comments (// and /* */), trailing commas, unquoted keys, single-quoted strings, and more. It's commonly used for config files (tsconfig, etc.) but is not valid for APIs. Tip: use strict JSON for data interchange and JSON5 only for local configuration files.

Paste your JSON into this tool — if it has syntax errors, you'll see an error message. Common issues: trailing commas, single quotes instead of double quotes, unquoted keys, and missing commas between entries. Tip: line numbers in error messages point to where the parser failed, but the actual error may be on a preceding line (e.g. a missing comma).

Minification removes all whitespace, newlines, and indentation from JSON, reducing file size for network transfer. This tool provides a minify option. In JavaScript: JSON.stringify(obj) without the space parameter produces minified output. Tip: gzip compression is more effective than minification alone — most servers compress JSON automatically.

There is no specification limit, but practical limits depend on the parser: JavaScript's JSON.parse can handle hundreds of MB. For APIs, keep payloads under 1-5 MB for good user experience. Tip: for large datasets, consider streaming JSON (NDJSON) or pagination instead of one massive response.