diff --git a/changelog/unreleased/issue-3129 b/changelog/unreleased/issue-3129
new file mode 100644
index 000000000..3340dca0e
--- /dev/null
+++ b/changelog/unreleased/issue-3129
@@ -0,0 +1,7 @@
+Enhancement: Add JSON support to prune
+
+Restic `prune` now also supports the `--json` option and gives all
+statistics in JSON format.
+
+https://github.com/restic/restic/issues/3129
+https://github.com/restic/restic/pull/5239
diff --git a/cmd/restic/cmd_prune.go b/cmd/restic/cmd_prune.go
index a613f2255..471fc9ecb 100644
--- a/cmd/restic/cmd_prune.go
+++ b/cmd/restic/cmd_prune.go
@@ -178,7 +178,12 @@ func runPruneWithRepo(ctx context.Context, opts PruneOptions, gopts GlobalOption
 		Print("warning: running prune without a cache, this may be very slow!\n")
 	}
 
-	printer := newTerminalProgressPrinter(gopts.verbosity, term)
+	var printer progress.Printer
+	if !gopts.JSON {
+		printer = newTerminalProgressPrinter(gopts.verbosity, term)
+	} else {
+		printer = &progress.NoopPrinter{}
+	}
 
 	printer.P("loading indexes...\n")
 	// loading the index before the snapshots is ok, as we use an exclusive lock here
@@ -214,9 +219,13 @@ func runPruneWithRepo(ctx context.Context, opts PruneOptions, gopts GlobalOption
 		printer.P("\nWould have made the following changes:")
 	}
 
-	err = printPruneStats(printer, plan.Stats())
-	if err != nil {
-		return err
+	if !gopts.JSON {
+		err = printPruneStats(printer, plan.Stats())
+		if err != nil {
+			return err
+		}
+	} else {
+		term.Print(ui.ToJSONString(plan.Stats()))
 	}
 
 	// Trigger GC to reset garbage collection threshold
@@ -235,24 +244,19 @@ func printPruneStats(printer progress.Printer, stats repository.PruneStats) erro
 	if stats.Size.Unref > 0 {
 		printer.V("unreferenced:                    %s\n", ui.FormatBytes(stats.Size.Unref))
 	}
-	totalBlobs := stats.Blobs.Used + stats.Blobs.Unused + stats.Blobs.Duplicate
-	totalSize := stats.Size.Used + stats.Size.Duplicate + stats.Size.Unused + stats.Size.Unref
-	unusedSize := stats.Size.Duplicate + stats.Size.Unused
-	printer.V("total:        %10d blobs / %s\n", totalBlobs, ui.FormatBytes(totalSize))
-	printer.V("unused size: %s of total size\n", ui.FormatPercent(unusedSize, totalSize))
+	printer.V("total:        %10d blobs / %s\n", stats.Blobs.Total, ui.FormatBytes(stats.Size.Total))
+	printer.V("unused size: %s of total size\n", ui.FormatPercent(stats.Size.Duplicate+stats.Size.Unused, stats.Size.Total))
 
 	printer.P("\nto repack:    %10d blobs / %s\n", stats.Blobs.Repack, ui.FormatBytes(stats.Size.Repack))
 	printer.P("this removes: %10d blobs / %s\n", stats.Blobs.Repackrm, ui.FormatBytes(stats.Size.Repackrm))
 	printer.P("to delete:    %10d blobs / %s\n", stats.Blobs.Remove, ui.FormatBytes(stats.Size.Remove+stats.Size.Unref))
-	totalPruneSize := stats.Size.Remove + stats.Size.Repackrm + stats.Size.Unref
-	printer.P("total prune:  %10d blobs / %s\n", stats.Blobs.Remove+stats.Blobs.Repackrm, ui.FormatBytes(totalPruneSize))
+	printer.P("total prune:  %10d blobs / %s\n", stats.Blobs.RemoveTotal, ui.FormatBytes(stats.Size.RemoveTotal))
 	if stats.Size.Uncompressed > 0 {
 		printer.P("not yet compressed:              %s\n", ui.FormatBytes(stats.Size.Uncompressed))
 	}
-	printer.P("remaining:    %10d blobs / %s\n", totalBlobs-(stats.Blobs.Remove+stats.Blobs.Repackrm), ui.FormatBytes(totalSize-totalPruneSize))
-	unusedAfter := unusedSize - stats.Size.Remove - stats.Size.Repackrm
+	printer.P("remaining:    %10d blobs / %s\n", stats.Blobs.Remain, ui.FormatBytes(stats.Size.Remain))
 	printer.P("unused size after prune: %s (%s of remaining size)\n",
-		ui.FormatBytes(unusedAfter), ui.FormatPercent(unusedAfter, totalSize-totalPruneSize))
+		ui.FormatBytes(stats.Size.RemainUnused), ui.FormatPercent(stats.Size.RemainUnused, stats.Size.Remain))
 	printer.P("\n")
 	printer.V("totally used packs: %10d\n", stats.Packs.Used)
 	printer.V("partly used packs:  %10d\n", stats.Packs.PartlyUsed)
diff --git a/doc/060_forget.rst b/doc/060_forget.rst
index b211148cb..8758bf7aa 100644
--- a/doc/060_forget.rst
+++ b/doc/060_forget.rst
@@ -467,6 +467,8 @@ The ``prune`` command accepts the following options:
 
 -  ``--verbose`` increased verbosity shows additional statistics for ``prune``.
 
+-  ``--json`` gives the statistics in JSON format.
+
 
 Recovering from "no free space" errors
 **************************************
diff --git a/internal/repository/prune.go b/internal/repository/prune.go
index ba13ba1a3..9ca188f73 100644
--- a/internal/repository/prune.go
+++ b/internal/repository/prune.go
@@ -32,32 +32,42 @@ type PruneOptions struct {
 
 type PruneStats struct {
 	Blobs struct {
-		Used      uint
-		Duplicate uint
-		Unused    uint
-		Remove    uint
-		Repack    uint
-		Repackrm  uint
-	}
+		Used         uint `json:"used"`
+		Duplicate    uint `json:"duplicate"`
+		Unused       uint `json:"unused"`
+		Total        uint `json:"total"`
+		Repack       uint `json:"repack"`
+		Repackrm     uint `json:"repack_remove"`
+		Remove       uint `json:"remove"`
+		RemoveTotal  uint `json:"remove_total"`
+		Remain       uint `json:"remaining"`
+		RemainUnused uint `json:"remaining_unused"`
+	} `json:"blobs"`
 	Size struct {
-		Used         uint64
-		Duplicate    uint64
-		Unused       uint64
-		Remove       uint64
-		Repack       uint64
-		Repackrm     uint64
-		Unref        uint64
-		Uncompressed uint64
-	}
+		Used         uint64 `json:"used"`
+		Duplicate    uint64 `json:"duplicate"`
+		Unused       uint64 `json:"unused"`
+		Unref        uint64 `json:"unreferenced"`
+		Uncompressed uint64 `json:"uncompressed"`
+		Total        uint64 `json:"total"`
+		Repack       uint64 `json:"repack"`
+		Repackrm     uint64 `json:"repack_remove"`
+		Remove       uint64 `json:"remove"`
+		RemoveTotal  uint64 `json:"remove_total"`
+		Remain       uint64 `json:"remaining"`
+		RemainUnused uint64 `json:"remaining_unused"`
+	} `json:"bytes"`
 	Packs struct {
-		Used       uint
-		Unused     uint
-		PartlyUsed uint
-		Unref      uint
-		Keep       uint
-		Repack     uint
-		Remove     uint
-	}
+		Used        uint `json:"used"`
+		Unused      uint `json:"unused"`
+		PartlyUsed  uint `json:"partly_used"`
+		Unref       uint `json:"unreferenced"`
+		Total       uint `json:"total"`
+		Keep        uint `json:"keep"`
+		Repack      uint `json:"repack"`
+		Remove      uint `json:"remove"`
+		RemoveTotal uint `json:"remove_total"`
+	} `json:"packfiles"`
 }
 
 type PrunePlan struct {
@@ -141,6 +151,17 @@ func PlanPrune(ctx context.Context, opts PruneOptions, repo *Repository, getUsed
 	}
 	plan.keepBlobs = keepBlobs
 
+	// calculate totals for statistics
+	stats.Blobs.Total = stats.Blobs.Used + stats.Blobs.Unused + stats.Blobs.Duplicate
+	stats.Blobs.RemoveTotal = stats.Blobs.Remove + stats.Blobs.Repackrm
+	stats.Blobs.Remain = stats.Blobs.Total - stats.Blobs.RemoveTotal
+	stats.Size.Total = stats.Size.Used + stats.Size.Duplicate + stats.Size.Unused + stats.Size.Unref
+	stats.Size.RemoveTotal = stats.Size.Remove + stats.Size.Repackrm + stats.Size.Unref
+	stats.Size.Remain = stats.Size.Total - stats.Size.RemoveTotal
+	stats.Size.RemainUnused = stats.Size.Duplicate + stats.Size.Unused - stats.Size.Remove - stats.Size.Repackrm
+	stats.Packs.Total = stats.Packs.Used + stats.Packs.PartlyUsed + stats.Packs.Unused + stats.Packs.Unref
+	stats.Packs.RemoveTotal = stats.Packs.Unref + stats.Packs.Remove
+
 	plan.repo = repo
 	plan.stats = stats
 	plan.opts = opts