curl -b cookies.txt from JSON Export
Turn a Chrome JSON export into the Netscape file curl -b and -c expect: tabs, #HttpOnly_ prefixes, Unix-second expiry and a trailing newline.
curl cookies.txtcurl -b cookies Open the guide
Free tool · no install
Online cookie format converter
Paste cookies in any common format — cookies.txt, JSON, a
Cookie: header, Set-Cookie lines, Base64 — and get back whichever format the
next tool expects. Detection is automatic and everything runs in this page: no upload, no
account, no logging.
100% client-side Instant, as you type 6 formats, both ways
Reference
Which format do you need?
Pick by destination: full-fidelity JSON for browsers and backups, Netscape for command line clients, a header string for a single request.
| Format | What it is | Typical consumer | Example |
|---|---|---|---|
| JSON Array EditThisCookie / Cookie-Editor style | Full-fidelity array of cookie objects with every attribute. The safest choice for backups and transfers. | Cookie extensions, test fixtures | [{ "name": "session_id", "value": "abc123", "domain": ".example.com",
"path": "/", "secure": true, "httpOnly": true, "sameSite": "lax" }] |
| JSON Map name → value | Flat key/value object. Compact and easy to read, but attributes are not preserved. | Quick scripts, API clients | { "session_id": "abc123", "theme": "dark" } |
| Netscape cookies.txt tab-separated | The classic seven-field text format understood by command line HTTP clients. | curl, wget, yt-dlp | .example.com TRUE / TRUE 1789200000 session_id abc123 |
| Header String Cookie: request header | A single line ready to paste into a request header, REST client or fetch call. | Postman, DevTools, fetch() | Cookie: session_id=abc123; theme=dark |
| Set-Cookie lines response headers | One Set-Cookie header per cookie, attributes included — how a server would issue them. | Server logs, HAR files | Set-Cookie: session_id=abc123; Path=/; Secure; HttpOnly; SameSite=Lax |
| Base64 encoded JSON array | A JSON array wrapped in Base64 for pasting through fields that mangle punctuation. | CI secrets, chat transfer | W3sibmFtZSI6InNlc3Npb25faWQiLCJ2YWx1ZSI6ImFiYzEyMyJ9XQ== |
More background: the cookies.txt format explained, JSON vs cookies.txt field mapping, and moving cookies between browsers.
Need the live cookies, not a file?
This converter works on text you already have. To read, edit and write the cookies your
browser is holding right now — including HttpOnly ones — install the
extension. Same parser, applied to real sessions.
Task-specific conversions
JSON Array vs cookies.txt Field Mapping
Side-by-side mapping of CookieMan JSON Array fields to Netscape cookies.txt. SameSite, partitionKey and store metadata never survive the seven-column file.
JSON vs cookies.txtcookies.txt field mapping Open the guide
Fix: Could not detect cookie format
CookieMan emits this warning when the paste is not JSON, Netscape, Cookie header, Set-Cookie or Base64. Strip the BOM, extract cookie text, then convert.
Could not detect cookie formatcookie format detection failed Open the guide
Converter FAQ
Which cookie formats does the converter support?
JSON Array, JSON Map, Netscape
cookies.txt, Header String (Cookie:), Set-Cookie lines and Base64-encoded JSON — in both directions. Input format is detected automatically.Is my cookie data sent to a server?
No. The conversion runs in your browser with JavaScript; this page has no upload endpoint and no analytics. You can disconnect from the network and it still works.
How do I convert cookies.txt to JSON?
Paste the contents of the file into the input box, leave the output format on JSON Array, and copy or download the result. Tabs are preserved when you paste, and
#HttpOnly_ prefixed lines are read as HttpOnly cookies rather than skipped as comments.Why is my Netscape file not detected?
The format requires real tab characters between the seven fields. Editors that convert tabs to spaces break it. Check that the expiry column is Unix seconds, not milliseconds — a 13-digit timestamp is a common giveaway. Task-specific fixes: spaces instead of tabs, millisecond expiry.
How is this different from the extension?
This page converts text between formats. The extension reads and writes the live cookies in your browser — inspecting a session, editing attributes, applying an import to real domains.
Can I use the converter offline?
Yes. Once the page has loaded, everything happens locally, so it keeps working with the network off.
Cookie work, without the guesswork
The extension adds live inspection and editing on top of the conversion you just did.
Free and MIT-licensed · Chrome, Edge and other Chromium browsers · Nothing leaves your machine