Reading the Results

Output	When
Live progress	In a terminal
Plain lines	With `--unix` or `--debug`, or when the output is not a terminal
JSON	With `--json` or `--jsonl`

Live progress

In a terminal, each test shows its progress as it runs:

Latency and packet loss show their measurements so far.
A download or upload shows its rate, a progress bar, and an estimate of the time left.
Each finished test becomes a line, and each server ends with a panel of its headline results.

Plain lines

$ speedtest-go --unix

    speedtest-go v1.8.0 (1559e47, 2026-05-02)

✓ ISP: 203.0.113.7 (Fujitsu) [34.9769, 138.3831]
✓ Found 20 Public Servers

✓ Test Server: [6691] 9.03km Shizuoka (Japan) by sudosan
✓ Latency: 4.452963ms Jitter: 41.271µs Min: 4.395179ms Max: 4.517576ms
✓ Packet Loss Analyzer: Running in background (<= 30 Secs)
✓ Download: 115.52 Mbps (Used: 135.75MB) (Latency: 4ms Jitter: 0ms Min: 4ms Max: 4ms)
✓ Upload: 4.02 Mbps (Used: 6.85MB) (Latency: 4ms Jitter: 1ms Min: 3ms Max: 8ms)
✓ Packet Loss: 8.82% (Sent: 217/Dup: 0/Max: 237)

Line	Shows
`ISP`	Your IP address, ISP, and coordinates
`Found`	How many servers were found
`Test Server`	The server’s ID, distance, location, and sponsor
`Latency`	The mean round trip, jitter, and the shortest and longest round trips
`Download`, `Upload`	The rate, the data moved, and the latency during the transfer
`Packet Loss`	The loss, and the counts it comes from

How a Test Works explains each measurement, and Output and privacy covers the rate units and hiding your address.

JSON reports

--json writes one document for the run, and --jsonl writes one line per server, each with a server object in place of the servers list.

{
  "timestamp": "2026-10-13 08:30:15.123",
  "userInfo": {
    "ip": "203.0.113.7",
    "lat": "35.6812",
    "lon": "139.7671",
    "isp": "Example ISP",
    "country": "JP"
  },
  "servers": [
    {
      "url": "http://speed.example/speedtest/upload.php",
      "lat": "35.6895",
      "lon": "139.6917",
      "name": "Tokyo",
      "country": "Japan",
      "cc": "JP",
      "sponsor": "Example Networks",
      "id": "1001",
      "host": "speed.example:8080",
      "distance": 6.95,
      "latency": 4500000,
      "maxLatency": 5000000,
      "minLatency": 4000000,
      "jitter": 300000,
      "dlSpeed": 12500000,
      "ulSpeed": 2500000,
      "testDuration": {
        "ping": 2000000000,
        "download": 10000000000,
        "upload": 10000000000,
        "total": 22000000000
      },
      "packetLoss": {
        "sent": 300,
        "dup": 1,
        "max": 301
      }
    }
  ]
}

Field	Unit or format
`timestamp`	Local time, as `YYYY-MM-DD hh:mm:ss.mmm`
`userInfo`	Your IP address, coordinates, ISP, and country code. All but the country are masked with `--mask-isp`
`lat`, `lon`	Degrees, as strings
`distance`	Kilometres. Left out with `--mask-isp`
`latency`, `minLatency`, `maxLatency`, `jitter`	Nanoseconds
`dlSpeed`, `ulSpeed`	Bytes per second. `0` when the test did not run, which its `testDuration` shows as `null`, and `-1` when it ran but counted no data and more than a tenth of its requests failed
`testDuration`	Nanoseconds for each test, or `null` when it did not run
`packetLoss`	The counts the loss comes from. See Packet loss

In the example, dlSpeed of 12500000 bytes per second is 100 Mbps.

How a Test Works