JSON Stringify

Minify formatted JSON into a compact single-line string. Paste indented JSON and click Run for API requests or environment variables.

  • Runs entirely in your browser
  • No data stored or sent to a server
  • Free forever — no signup
  • Instant conversion

Input and Output

Use the interactive encoder and decoder on this page to process your text.

Learn more about JSON stringify

How to Minify JSON to a Single-Line String

JSON Stringify

When to Stringify JSON

Minify JSON when sending compact payloads to APIs, storing configuration in environment variables, reducing log size, or embedding JSON in script tags and CSV fields.

Real-World Examples

Multi-line config → single line for JSON.stringify in environment variables

Formatted API fixture → compact string for unit test snapshots

{"ok":true,"count":42} ready for HTTP request bodies

Common Mistakes

  • Stringifying already-minified JSON repeatedly (harmless but pointless)
  • Embedding minified JSON in HTML without escaping </script> sequences
  • Assuming key order is preserved — some parsers reorder keys

Edge Cases

  • undefined values in JavaScript objects are omitted by JSON.stringify — not valid JSON values
  • NaN and Infinity are not valid JSON numbers
  • Unicode and escaped characters remain escaped in output

Developer Tips

  • JavaScript: JSON.stringify(obj) for compact output
  • Use formatted JSON in repos; stringify only for transport/storage constraints

Frequently asked questions

Does stringify remove whitespace only?

Yes for valid JSON input. The parser normalizes the structure and re-emits a compact string without extra spaces.

Will key order change?

JSON.parse and JSON.stringify in JavaScript generally preserve insertion order for object keys, but do not rely on key order across languages.

Can I stringify invalid JSON?

No. Input must be valid JSON before it can be minified safely.