Extract text from Python cookie jars (JR)
To convert JR cookie jars to another format, you need Python or other Developer software.
To convert other file formats to the "Serialized Cookie File" file type, you need software like Python or a similar tool.
The .JR file format is primarily a serialized cookie jar file used by the Python requests library to maintain HTTP sessions across multiple requests. Developers use these files to store authentication tokens, session IDs, and user preferences so a script does not need to log in to a web server repeatedly. You can learn more about the underlying technology on the HTTP cookie Wikipedia page.
Typically, these files are created and read using Python's internal pickle module or the http.cookiejar class. Because .JR files are often saved as raw binary Python objects, they present a major disadvantage for interoperability: they cannot be read by standard text editors, web browsers, or non-Python programming languages like JavaScript or PHP. Furthermore, opening an untrusted pickled file poses a severe security risk, as the unpickling process can execute arbitrary code on your system.
To overcome these limitations, developers often need to convert .JR files to open, human-readable formats. The best target formats are JSON or TXT (often in the Netscape HTTP Cookie File format). Converting to JSON ensures the cookie names, values, domains, and expiry dates are safely readable and easily parsed by other languages, though specific Python class metadata will be lost in the transition.
Converting .JR files is notoriously difficult because they rely on proprietary, language-specific serialization logic. Standard online file converters fail because they lack the secure Python environment required to deserialize the object safely. Just drag and drop your file to see what it is and convert it if supported. convert.guru can securely inspect the .JR file format, identify its structure, and extract plain text or internal data. If our analysis detects standard embedded string data, viewing or converting the HTTP cookies into a safer format is still possible.
Convert.Guru analyzes your JR file, detects the exact format, and lets you read the text inside.
Users also converted JRN, ZIP, MARKER, SHAPES and BITMAP files.
If you want to convert JR file to , you can use Python or similar software from the "Session Cookie Storage" category. In the File menu, look for Save As… or Export….
To convert files to JR, try Python or another comparable tool in the "Session Cookie Storage" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our JR converter.