Cookie Converter Online – Netscape to JSON, JSON to Netscape, TXT Formatter

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Easily convert cookies between Netscape (cookies.txt), JSON array, and simple TXT formats using our Cookie Converter. Designed for developers and non-technical users alike.

This guide explains cookie formats (Netscape, JSON, TXT), how to convert between them safely, common errors, and quick validation tips.

JSON cookie exports usually come as an array of objects with fields like name, value, domain, path, expiry, and secure. This format is common for modern tools and libraries.

Different tools and libraries expect different cookie formats. That mismatch creates import errors, scraping failures, or broken sessions. A reliable Cookie Converter removes format friction so your workflows keep running.

Supported Input & Output Formats

  • Accepted inputs: Netscape cookies.txt, JSON array exports, or simple name=value lists
  • Output formats: Netscape (cookies.txt), JSON array, and plain TXT
  • Encoding: UTF-8 preferred
  • Line endings: LF or CRLF supported
  • No account required; files not stored permanently

Note: Always validate the converted file in your target tool. The converter aims to preserve essential fields but some custom tools may expect extra fields.

  • Preserves important fields like domain, path, expiry, and secure flags
  • Fixes encoding and delimiter problems automatically
  • Copy-paste friendly and provides downloadable output
  • Useful for developers, QA, and automation scripts

The process is simple and works on mobile and desktop. Use the converter on our website to convert or download cookie files in your desired format.

Step-by-Step Conversion Guide

  1. Paste Sample: If you don’t have a file, paste a small sample of cookie lines or JSON array.
  2. Fix Issues: Use the validation hints to fix missing fields or encoding problems.
  3. Export: Export the converted result or copy it to clipboard for quick use.
  4. Load Into Script: Use the converted cookies in your automation or browser tool.
  5. Repeat: Repeat for other formats as needed.
  • Use UTF-8 encoding to avoid character corruption.
  • For long cookie values, avoid copying from rendered HTML — use raw export files.
  • If converting from cookies.txt, check for header lines and remove them if present.
  • Test converted output with a small sample before running large imports.
Common Error Solution
Invalid JSON structure Fix JSON syntax or paste a valid JSON array
Encoding issues Ensure UTF-8 encoding before conversion
Missing name/value field Ensure each cookie has `name` and `value`
Extra comment lines in cookies.txt Remove comment lines before converting
Delimiter mismatch in TXT Use standard name=value with one cookie per line
Incorrect expiry format Convert expiry to Unix timestamp or remove if not needed
  • Exported Cookie Files: Use browser or extension exports (cookies.txt or JSON) for accuracy.
  • Programmatic JSON: Ensure your JSON objects have correct fields before converting.
  • Best Practice: Always validate converted output in a sandboxed environment before production use.
  • Preview converted output before downloading
  • Test with a small sample cookie file first
  • Keep backups of originals before converting
  • Use UTF-8 encoding to prevent character corruption
  • Validate domain/path fields if sessions fail after import

Final Checklist Before Using Converted Cookies

  • ✓ Input format correctly detected
  • ✓ Output format chosen (Netscape / JSON / TXT)
  • ✓ Name and value fields preserved
  • ✓ Domain and path fields present if required
  • ✓ Encoding: UTF-8
  • ✓ Test in a non-production environment first

Frequently Asked Questions

What input formats does the cookie converter accept?

It accepts Netscape cookies.txt, JSON array cookie exports, and simple name=value TXT lists. The tool auto-detects the format.

Is my cookie data stored on your servers?

We process data client-side where possible. If server-side conversion runs, we do not permanently store files and remove them after processing. Check the tool UI for the current behaviour.

Can I convert large cookie files?

Yes for most small-to-medium files. For very large exports, try splitting into smaller files to ensure smooth processing.

Will secure flags and expiry dates be preserved?

The tool preserves secure, expiry, domain, and path fields when available in the input.

Do I need to sign in to use the converter?

No, the basic conversion is free and doesn’t require an account.