diff --git a/bench/import.go b/bench/import.go
index 3688d2625..5a584933a 100644
--- a/bench/import.go
+++ b/bench/import.go
@@ -22,16 +22,16 @@ func NewImport(stdin io.Reader, stdout, stderr io.Writer) *Import {
 
 // Import sets bits with increasing profile id and bitmap id.
 type Import struct {
-	BaseBitmapID      int64
-	MaxBitmapID       int64
-	BaseProfileID     int64
-	MaxProfileID      int64
-	RandomBitmapOrder bool
-	MinBitsPerMap     int64
-	MaxBitsPerMap     int64
-	AgentControls     string
-	Seed              int64
-	numbits           int
+	BaseBitmapID      int64  `json:"base-bitmap-id"`
+	MaxBitmapID       int64  `json:"max-bitmap-id"`
+	BaseProfileID     int64  `json:"base-profile-id"`
+	MaxProfileID      int64  `json:"max-profile-id"`
+	RandomBitmapOrder bool   `json:"random-bitmap-order"`
+	MinBitsPerMap     int64  `json:"min-bits-per-map"`
+	MaxBitsPerMap     int64  `json:"max-bits-per-map"`
+	AgentControls     string `json:"agent-controls"`
+	Seed              int64  `json:"seed"`
+	numbits           int    `json:""`
 
 	*pilosactl.ImportCommand
 }
diff --git a/bench/randquery.go b/bench/randquery.go
index b844b4e3e..3d6228f74 100644
--- a/bench/randquery.go
+++ b/bench/randquery.go
@@ -12,15 +12,14 @@ import (
 // RandomQuery queries randomly and deterministically based on a seed.
 type RandomQuery struct {
 	HasClient
-	MaxDepth      int
-	MaxArgs       int
-	MaxN          int
-	BaseBitmapID  int64
-	BitmapIDRange int64
-	Iterations    int // number of queries
-	Seed          int64
-	DBs           []string // DBs to query.
-
+	MaxDepth      int      `json:"max-depth"`
+	MaxArgs       int      `json:"max-args"`
+	MaxN          int      `json:"max-n"`
+	BaseBitmapID  int64    `json:"base-bitmap-id"`
+	BitmapIDRange int64    `json:"bitmap-id-range"`
+	Iterations    int      `json:"iterations"`
+	Seed          int64    `json:"seed"`
+	DBs           []string `json:"dbs"`
 }
 
 func (b *RandomQuery) Usage() string {
diff --git a/bench/sliceheight.go b/bench/sliceheight.go
index bc3484b8d..d405c89a5 100644
--- a/bench/sliceheight.go
+++ b/bench/sliceheight.go
@@ -23,18 +23,18 @@ func NewSliceHeight(stdin io.Reader, stdout, stderr io.Writer) *SliceHeight {
 // SliceHeight benchmark tests the effect of an increasing number of bitmaps in
 // a single slice on query time.
 type SliceHeight struct {
-	MaxTime time.Duration
-	hosts   []string
+	MaxTime time.Duration `json:"max-time"`
+	hosts   []string      `json:""`
 
-	MinBitsPerMap int64
-	MaxBitsPerMap int64
-	Seed          int64
-	Database      string
-	Frame         string
+	MinBitsPerMap int64  `json:"min-bits-per-map"`
+	MaxBitsPerMap int64  `json:"max-bits-per-map"`
+	Seed          int64  `json:"seed"`
+	Database      string `json:"database"`
+	Frame         string `json:"frame"`
 
-	Stdin  io.Reader
-	Stdout io.Writer
-	Stderr io.Writer
+	Stdin  io.Reader `json:""`
+	Stdout io.Writer `json:""`
+	Stderr io.Writer `json:""`
 }
 
 func (b *SliceHeight) Usage() string {