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# JSON Reports
nextpnr can write a JSON report using `--report` post-place-and-route for integration with other build systems. It contains information on post-pack utilization and maximum achieved frequency for each clock domain, and is of the following format:
```
{
"utilization": {
<beltype>: {
"used": <number of bels used in design>,
"available": <total number of bels available in device>
},
...
},
"fmax": {
<clock domain>: {
"achieved": <computed Fmax of routed design for clock in MHz>,
"constraint": <constraint for clock in MHz>
},
...
}
}
```
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