Cookie Converter – Convert Cookies Between Netscape, JSON & TXT Online

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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.

TXT-style cookie lists are simple name=value pairs or custom delimited rows. Our tool handles these variants and maps them to Netscape or JSON as needed.

Character encoding, missing fields, or wrong delimiters in cookie files cause scripts to fail. The Cookie Converter normalises cookie data and validates required fields so you don’t waste time debugging.

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.

  • Instant conversion between Netscape, JSON, and TXT cookie formats
  • Client-side processing option (where supported) for privacy
  • Automatic field mapping and validation
  • Example inputs shown to reduce user errors
  • No signup required and minimal UI for quick workflows

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. Choose Input: Select cookies.txt, JSON, or paste a name=value list into the input box.
  2. Preview & Auto-detect: The tool auto-detects format and shows a preview of parsed cookies.
  3. Select Output Format: Pick Netscape (cookies.txt), JSON array, or TXT as the output.
  4. Convert & Download: Click Convert to produce the output and download the converted file.
  5. Validate: Open the converted file and ensure name/value pairs and domains look correct before use.
  • Export cookies from browser devtools or an extension in Netscape (cookies.txt) or JSON format.
  • Open the file in a text editor to ensure it has cookie name=value pairs or valid JSON array.
  • If using JSON, ensure each cookie object has at least `name` and `value` fields.
  • Remove any extra comments or non-cookie lines before conversion.
Common Error Solution
Incorrect expiry format Convert expiry to Unix timestamp or remove if not needed
Invalid JSON structure Fix JSON syntax or paste a valid JSON array
Encoding issues Ensure UTF-8 encoding before conversion
Extra comment lines in cookies.txt Remove comment lines before converting
Missing name/value field Ensure each cookie has `name` and `value`
Delimiter mismatch in TXT Use standard name=value with one cookie per line
  • 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

How do I convert cookies.txt to JSON?

Upload or paste your cookies.txt file, choose JSON as output, and click Convert. The tool maps each line to a JSON object with name and value fields and includes other available fields.

Can I convert JSON cookies to Netscape format?

Yes — pick Netscape output and the tool writes cookies in the standard line-based Netscape format.

What if my JSON is invalid?

The tool will show a validation error and suggest fixes; correct the JSON structure and retry.

Is there an API for programmatic conversion?

At present the web UI is the primary interface. For automation, consider using server-side scripts that mimic the tool’s mapping logic.