Cookie File Converter – Netscape Cookie Format to JSON & TXT Online

Need to convert browser cookies between Netscape, JSON, and TXT formats? Use our Cookie Converter for fast, reliable conversion with examples and format help.

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

What is Netscape / JSON Cookie Format?

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.

Why Cookie Format Conversion Matters

Exporting cookies from browser tools often yields Netscape-format files but many scripts require JSON. Converting manually is error-prone. The Cookie Converter automates format mapping and fixes common issues.

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.

How Our Cookie Converter Works

• 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.

Preparation Tips for Reliable Cookie Conversion

• 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 Cookie Conversion Errors & Solutions

Common Error	Solution
Encoding issues	Ensure UTF-8 encoding before conversion
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
Missing name/value field	Ensure each cookie has `name` and `value`
Invalid JSON structure	Fix JSON syntax or paste a valid JSON array
Extra comment lines in cookies.txt	Remove comment lines before converting

Digital vs Exported Cookie Files

• 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.

Pro Tips for Reliable Cookie Conversion

• 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