Input
Waiting for input
1
Output
1
JSON to HAR Converter
Turn structured request/response JSON into a valid HAR 1.2 file you can drop into Chrome DevTools, Firefox, or any HAR viewer.
Instant
Runs entirely in your browser — no upload, no wait.
100% private
Your JSON never leaves the tab. Nothing is logged.
No signup
Free, unlimited, no account required.
What HAR is for
HTTP Archive (HAR) is the W3C-tracked JSON format DevTools uses to record network activity. Sharing a HAR file lets a teammate replay your exact session — headers, bodies, timing, cookies — in their own DevTools.
Minimum required fields
Each entry needs a startedDateTime, request (with method, url, headers), and response (with status, content). Timing fields are optional but make waterfall views meaningful.
{
"log": {
"version": "1.2",
"creator": {"name": "jsonbeautify", "version": "1.0"},
"entries": [{
"startedDateTime": "2026-01-01T00:00:00Z",
"request": {"method": "GET", "url": "https://api.example.com", "headers": []},
"response": {"status": 200, "content": {"text": "{}"}}
}]
}
}Why generate HAR programmatically
Recording from DevTools is fine for one-off captures, but reproducible test fixtures, mock servers, and load-testing replay scripts often need HAR files generated from synthetic data. The converter handles the format details so you can focus on the request shape.
Validating the result
The output is checked against the official HAR 1.2 JSON Schema. Errors point at the offending entry by index so you can fix the source quickly.
Privacy
Conversion runs locally. Your request/response data stays in your browser.