Minify JSON in JavaScript

JSON minification removes insignificant whitespace while preserving the represented data. A parser-based approach is safer than regular expressions because whitespace inside strings must be preserved.

Quick Start#

The following example uses the standard JavaScript API or a widely used package for this task.

Quick start#

1function minifyJson(input) {2  return JSON.stringify(JSON.parse(input));3}45console.log(minifyJson({6  "name": "ToolPorta",7  "active": true8}));

Common Operations#

This second pattern covers a common production operation or a safer way to handle real input.

Handle errors#

1try {2  const minified = JSON.stringify(JSON.parse(source));3  console.log(minified);4} catch (error) {5  console.error("Invalid JSON", error);6}

Important Notes#

Do not remove whitespace with a regex: spaces inside JSON strings are data. Parse and serialize, or use a JSON-aware compactor.

Best Practices#

1. Treat external input as untrusted and handle parse/validation errors explicitly.
2. Keep encoding, units, formats, and library-specific mapping rules explicit at system boundaries.
3. Add test vectors that cover empty input, Unicode text, malformed input, and representative production data.

References#

• RFC 8259: The JSON Data Interchange Format
• MDN JavaScript