diff --git a/daqbuffer/src/test/json.rs b/daqbuffer/src/test/json.rs
index 58f1baf..0e236c0 100644
--- a/daqbuffer/src/test/json.rs
+++ b/daqbuffer/src/test/json.rs
@@ -58,7 +58,11 @@ async fn get_binned_json_0_inner2(
     }
     let res = hyper::body::to_bytes(res.into_body()).await?;
     let res = String::from_utf8(res.to_vec())?;
-    info!("result from endpoint: [[[\n{}\n]]]", res);
+    let res: serde_json::Value = serde_json::from_str(res.as_str())?;
+    info!(
+        "result from endpoint: --------------\n{}\n--------------",
+        serde_json::to_string_pretty(&res)?
+    );
     let t2 = chrono::Utc::now();
     let ms = t2.signed_duration_since(t1).num_milliseconds() as u64;
     info!("get_binned_json_0  DONE  time {} ms", ms);
diff --git a/disk/src/agg/streams.rs b/disk/src/agg/streams.rs
index d13eb2c..06d52cb 100644
--- a/disk/src/agg/streams.rs
+++ b/disk/src/agg/streams.rs
@@ -17,20 +17,29 @@ pub enum StreamItem<T> {
     Stats(StatsItem),
 }
 
+// TODO remove in favor of WithLen:
 pub trait Bins {
     fn bin_count(&self) -> u32;
 }
 
-// TODO this is meant for bins, count them, collect range-complete, and deliver these
-// information also to the client.
+// TODO remove:
 pub trait Collected {
     fn new(bin_count_exp: u32) -> Self;
     fn timed_out(&mut self, k: bool);
 }
 
+pub trait Collector {
+    type Input: Collectable;
+    type Output: Serialize;
+    fn ingest(&mut self, src: &Self::Input);
+    fn set_range_complete(&mut self);
+    fn set_timed_out(&mut self);
+    fn result(self) -> Result<Self::Output, Error>;
+}
+
 pub trait Collectable {
-    type Collected: Collected;
-    fn append_to(&self, collected: &mut Self::Collected);
+    type Collector: Collector<Input = Self>;
+    fn new_collector(bin_count_exp: u32) -> Self::Collector;
 }
 
 // TODO can be removed?
@@ -39,12 +48,14 @@ pub trait Collectable2: Any {
     fn append(&mut self, src: &dyn Any);
 }
 
+// TODO remove
 pub trait CollectionSpec2 {
     // TODO Can I use here associated types and return concrete types?
     // Probably not object safe.
     fn empty(&self) -> Box<dyn Collectable2>;
 }
 
+// TODO rmove
 pub trait CollectionSpecMaker2 {
     fn spec(bin_count_exp: u32) -> Box<dyn CollectionSpec2>;
 }
diff --git a/disk/src/binned.rs b/disk/src/binned.rs
index c0219b0..93c3045 100644
--- a/disk/src/binned.rs
+++ b/disk/src/binned.rs
@@ -9,8 +9,8 @@ use crate::agg::enp::{Identity, WaveXBinner, XBinnedScalarEvents};
 use crate::agg::eventbatch::MinMaxAvgScalarEventBatch;
 use crate::agg::scalarbinbatch::MinMaxAvgScalarBinBatch;
 use crate::agg::streams::{
-    Appendable, Collectable, Collectable2, Collected, CollectionSpec2, CollectionSpecMaker2, StreamItem, ToJsonBytes,
-    ToJsonResult,
+    Appendable, Collectable, Collectable2, Collected, CollectionSpec2, CollectionSpecMaker2, Collector, StreamItem,
+    ToJsonBytes, ToJsonResult,
 };
 use crate::agg::{Fits, FitsInside};
 use crate::binned::binnedfrompbv::BinnedFromPreBinned;
@@ -89,20 +89,6 @@ impl Collected for MinMaxAvgScalarBinBatchCollected {
     }
 }
 
-impl Collectable for MinMaxAvgScalarBinBatch {
-    type Collected = MinMaxAvgScalarBinBatchCollected;
-
-    fn append_to(&self, collected: &mut Self::Collected) {
-        let batch = &mut collected.batch;
-        batch.ts1s.extend_from_slice(&self.ts1s);
-        batch.ts2s.extend_from_slice(&self.ts2s);
-        batch.counts.extend_from_slice(&self.counts);
-        batch.mins.extend_from_slice(&self.mins);
-        batch.maxs.extend_from_slice(&self.maxs);
-        batch.avgs.extend_from_slice(&self.avgs);
-    }
-}
-
 #[derive(Debug, Serialize, Deserialize)]
 pub struct MinMaxAvgScalarBinBatchCollectedJsonResult {
     #[serde(rename = "tsBinEdges")]
@@ -293,9 +279,8 @@ where
         FrameType + Framable + DeserializeOwned,
     Sitemty<<<ENP as EventsNodeProcessor>::Output as TimeBinnableType>::Output>: ToJsonResult + Framable,
 {
-    let _ = ppp;
     let res = make_num_pipeline_nty_end_evs_enp_stat::<_, _, _, ENP>(event_value_shape, query, node_config)?;
-    let s = PPP::convert(res.stream);
+    let s = ppp.convert(res.stream, res.bin_count);
     let ret = BinnedResponseDyn {
         stream: Box::pin(s),
         bin_count: res.bin_count,
@@ -411,41 +396,135 @@ where
     }
 }
 
-pub trait PipelinePostProcessA {
-    fn unused(&self);
-}
+pub trait PipelinePostProcessA {}
 
-struct Ppp1 {}
+struct MakeBoxedItems {}
 
-impl PipelinePostProcessA for Ppp1 {
-    fn unused(&self) {
-        todo!()
-    }
-}
+impl PipelinePostProcessA for MakeBoxedItems {}
 
 pub trait PipelinePostProcessB<T> {
     fn convert(
+        &self,
         inp: Pin<Box<dyn Stream<Item = Sitemty<T>> + Send>>,
+        bin_count_exp: u32,
     ) -> Pin<Box<dyn Stream<Item = Box<dyn BinnedResponseItem>> + Send>>;
 }
 
-impl<NTY> PipelinePostProcessB<MinMaxAvgBins<NTY>> for Ppp1
+impl<NTY> PipelinePostProcessB<MinMaxAvgBins<NTY>> for MakeBoxedItems
 where
     NTY: NumOps,
 {
     fn convert(
+        &self,
         inp: Pin<Box<dyn Stream<Item = Sitemty<MinMaxAvgBins<NTY>>> + Send>>,
+        bin_count_exp: u32,
     ) -> Pin<Box<dyn Stream<Item = Box<dyn BinnedResponseItem>> + Send>> {
         let s = StreamExt::map(inp, |item| Box::new(item) as Box<dyn BinnedResponseItem>);
         Box::pin(s)
     }
 }
 
+struct CollectForJson {}
+
+impl CollectForJson {
+    pub fn new() -> Self {
+        Self {}
+    }
+}
+
+impl PipelinePostProcessA for CollectForJson {}
+
+pub struct JsonCollector {
+    fut: Pin<Box<dyn Future<Output = Result<serde_json::Value, Error>> + Send>>,
+    done: bool,
+}
+
+impl JsonCollector {
+    pub fn new<NTY>(inp: Pin<Box<dyn Stream<Item = Sitemty<MinMaxAvgBins<NTY>>> + Send>>, bin_count_exp: u32) -> Self
+    where
+        NTY: NumOps + Serialize + 'static,
+    {
+        let fut = collect_all(inp, bin_count_exp);
+        let fut = Box::pin(fut);
+        Self { fut, done: false }
+    }
+}
+
+impl Framable for Sitemty<serde_json::Value> {
+    fn make_frame(&self) -> Result<BytesMut, Error> {
+        panic!()
+    }
+}
+
+impl ToJsonBytes for serde_json::Value {
+    fn to_json_bytes(&self) -> Result<Vec<u8>, Error> {
+        Ok(serde_json::to_vec(self)?)
+    }
+}
+
+impl ToJsonResult for Sitemty<serde_json::Value> {
+    fn to_json_result(&self) -> Result<Box<dyn ToJsonBytes>, Error> {
+        match self {
+            Ok(item) => match item {
+                StreamItem::DataItem(item) => match item {
+                    RangeCompletableItem::Data(item) => Ok(Box::new(item.clone())),
+                    RangeCompletableItem::RangeComplete => Err(Error::with_msg("logic")),
+                },
+                StreamItem::Log(_) => Err(Error::with_msg("logic")),
+                StreamItem::Stats(_) => Err(Error::with_msg("logic")),
+            },
+            Err(_) => Err(Error::with_msg("logic")),
+        }
+    }
+}
+
+impl Stream for JsonCollector {
+    type Item = Box<dyn BinnedResponseItem>;
+
+    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
+        use Poll::*;
+        loop {
+            break if self.done {
+                Ready(None)
+            } else {
+                match self.fut.poll_unpin(cx) {
+                    Ready(Ok(item)) => {
+                        let item = Ok(StreamItem::DataItem(RangeCompletableItem::Data(item)));
+                        let item = Box::new(item) as Box<dyn BinnedResponseItem>;
+                        self.done = true;
+                        Ready(Some(item))
+                    }
+                    Ready(Err(e)) => {
+                        let item = Err::<StreamItem<RangeCompletableItem<serde_json::Value>>, _>(e);
+                        let item = Box::new(item) as Box<dyn BinnedResponseItem>;
+                        Ready(Some(item))
+                    }
+                    Pending => Pending,
+                }
+            };
+        }
+    }
+}
+
+impl<NTY> PipelinePostProcessB<MinMaxAvgBins<NTY>> for CollectForJson
+where
+    NTY: NumOps,
+{
+    fn convert(
+        &self,
+        inp: Pin<Box<dyn Stream<Item = Sitemty<MinMaxAvgBins<NTY>>> + Send>>,
+        bin_count_exp: u32,
+    ) -> Pin<Box<dyn Stream<Item = Box<dyn BinnedResponseItem>> + Send>> {
+        let s = JsonCollector::new(inp, bin_count_exp);
+        Box::pin(s)
+    }
+}
+
 pub async fn binned_bytes_for_http(
     query: &BinnedQuery,
     node_config: &NodeConfigCached,
 ) -> Result<Pin<Box<dyn Stream<Item = Result<Bytes, Error>> + Send>>, Error> {
-    let pl = make_num_pipeline::<Ppp1>(query, Ppp1 {}, node_config).await?;
+    let pl = make_num_pipeline::<MakeBoxedItems>(query, MakeBoxedItems {}, node_config).await?;
     let ret = pl.stream.map(|item| {
         let fr = item.make_frame();
         let fr = fr?;
@@ -527,13 +606,13 @@ impl Serialize for IsoDateTime {
     }
 }
 
-pub async fn collect_all<S>(stream: S, collection_spec: Box<dyn CollectionSpec2>) -> Result<serde_json::Value, Error>
+pub async fn collect_all<T, S>(stream: S, bin_count_exp: u32) -> Result<serde_json::Value, Error>
 where
-    S: Stream<Item = Sitemty<Box<dyn Any>>> + Unpin,
+    S: Stream<Item = Sitemty<T>> + Unpin,
+    T: Collectable,
 {
     let deadline = tokio::time::Instant::now() + Duration::from_millis(1000);
-    //let mut main_item = <T as Collectable>::Collected::new(bin_count_exp);
-    let mut main_item = collection_spec.empty();
+    let mut collector = <T as Collectable>::new_collector(bin_count_exp);
     let mut i1 = 0;
     let mut stream = stream;
     loop {
@@ -544,13 +623,7 @@ where
             match tokio::time::timeout_at(deadline, stream.next()).await {
                 Ok(k) => k,
                 Err(_) => {
-                    // TODO
-
-                    // TODO
-
-                    // TODO
-
-                    //main_item.timed_out(true);
+                    collector.set_timed_out();
                     None
                 }
             }
@@ -562,10 +635,11 @@ where
                         StreamItem::Log(_) => {}
                         StreamItem::Stats(_) => {}
                         StreamItem::DataItem(item) => match item {
-                            RangeCompletableItem::RangeComplete => {}
+                            RangeCompletableItem::RangeComplete => {
+                                collector.set_range_complete();
+                            }
                             RangeCompletableItem::Data(item) => {
-                                main_item.append(&item);
-                                //item.append_to(&mut main_item);
+                                collector.ingest(&item);
                                 i1 += 1;
                             }
                         },
@@ -579,31 +653,21 @@ where
             None => break,
         }
     }
-    Ok(err::todoval())
-}
-
-// TODO remove
-#[derive(Debug, Serialize, Deserialize)]
-pub struct UnusedBinnedJsonResult {
-    ts_bin_edges: Vec<IsoDateTime>,
-    counts: Vec<u64>,
-    #[serde(skip_serializing_if = "Bool::is_false")]
-    finalised_range: bool,
-    #[serde(skip_serializing_if = "Zero::is_zero")]
-    missing_bins: u64,
-    #[serde(skip_serializing_if = "Option::is_none")]
-    continue_at: Option<IsoDateTime>,
-}
-
-pub async fn binned_json(node_config: &NodeConfigCached, query: &BinnedQuery) -> Result<serde_json::Value, Error> {
-    err::todoval()
-    /*
-    let pl = make_num_pipeline_for_entry(query, node_config).await?;
-    let collected = collect_all(pl.stream, pl.bin_count).await?;
-    let ret = ToJsonResult::to_json_result(&collected)?;
-    let ret = serde_json::to_value(ret)?;
+    let ret = serde_json::to_value(collector.result()?)?;
     Ok(ret)
-    */
+}
+
+pub async fn binned_json(
+    node_config: &NodeConfigCached,
+    query: &BinnedQuery,
+) -> Result<Pin<Box<dyn Stream<Item = Result<Bytes, Error>> + Send>>, Error> {
+    let pl = make_num_pipeline(query, CollectForJson::new(), node_config).await?;
+    let ret = pl.stream.map(|item| {
+        let fr = item.to_json_result()?;
+        let buf = fr.to_json_bytes()?;
+        Ok(Bytes::from(buf))
+    });
+    Ok(Box::pin(ret))
 }
 
 pub struct ReadPbv<T>
@@ -767,7 +831,6 @@ pub trait TBinnedBins:
     + Send
     + Serialize
     + DeserializeOwned
-    + Collectable
     + ReadableFromFile
     + FilterFittingInside
     + AggregatableTdim2
@@ -1063,6 +1126,105 @@ where
     }
 }
 
+#[derive(Serialize)]
+pub struct MinMaxAvgBinsCollectedResult<NTY> {
+    ts_bin_edges: Vec<IsoDateTime>,
+    counts: Vec<u64>,
+    mins: Vec<Option<NTY>>,
+    maxs: Vec<Option<NTY>>,
+    avgs: Vec<Option<f32>>,
+    #[serde(skip_serializing_if = "Bool::is_false", rename = "finalisedRange")]
+    finalised_range: bool,
+    #[serde(skip_serializing_if = "Zero::is_zero", rename = "missingBins")]
+    missing_bins: u32,
+    #[serde(skip_serializing_if = "Option::is_none", rename = "continueAt")]
+    continue_at: Option<IsoDateTime>,
+}
+
+pub struct MinMaxAvgBinsCollector<NTY> {
+    bin_count_exp: u32,
+    timed_out: bool,
+    range_complete: bool,
+    vals: MinMaxAvgBins<NTY>,
+    _m1: PhantomData<NTY>,
+}
+
+impl<NTY> MinMaxAvgBinsCollector<NTY> {
+    pub fn new(bin_count_exp: u32) -> Self {
+        Self {
+            bin_count_exp,
+            timed_out: false,
+            range_complete: false,
+            vals: MinMaxAvgBins::<NTY>::empty(),
+            _m1: PhantomData,
+        }
+    }
+}
+
+impl<NTY> Collector for MinMaxAvgBinsCollector<NTY>
+where
+    NTY: NumOps + Serialize,
+{
+    type Input = MinMaxAvgBins<NTY>;
+    type Output = MinMaxAvgBinsCollectedResult<NTY>;
+
+    fn ingest(&mut self, src: &Self::Input) {
+        Appendable::append(&mut self.vals, src);
+    }
+
+    fn set_range_complete(&mut self) {
+        self.range_complete = true;
+    }
+
+    fn set_timed_out(&mut self) {
+        self.timed_out = true;
+    }
+
+    fn result(self) -> Result<Self::Output, Error> {
+        let bin_count = self.vals.ts1s.len() as u32;
+        let mut tsa: Vec<_> = self
+            .vals
+            .ts1s
+            .iter()
+            .map(|&k| IsoDateTime(Utc.timestamp_nanos(k as i64)))
+            .collect();
+        if let Some(&z) = self.vals.ts2s.last() {
+            tsa.push(IsoDateTime(Utc.timestamp_nanos(z as i64)));
+        }
+        let tsa = tsa;
+        let continue_at = if self.vals.ts1s.len() < self.bin_count_exp as usize {
+            match tsa.last() {
+                Some(k) => Some(k.clone()),
+                None => Err(Error::with_msg("partial_content but no bin in result"))?,
+            }
+        } else {
+            None
+        };
+        let ret = MinMaxAvgBinsCollectedResult::<NTY> {
+            ts_bin_edges: tsa,
+            counts: vec![],
+            mins: self.vals.mins,
+            maxs: self.vals.maxs,
+            avgs: self.vals.avgs,
+            finalised_range: self.range_complete,
+            missing_bins: self.bin_count_exp - bin_count,
+            continue_at,
+        };
+        Ok(ret)
+    }
+}
+
+impl<NTY> Collectable for MinMaxAvgBins<NTY>
+where
+    NTY: NumOps + Serialize,
+{
+    type Collector = MinMaxAvgBinsCollector<NTY>;
+
+    fn new_collector(bin_count_exp: u32) -> Self::Collector {
+        Self::Collector::new(bin_count_exp)
+    }
+}
+
 pub struct MinMaxAvgAggregator<NTY> {
     range: NanoRange,
     count: u32,
diff --git a/httpret/src/lib.rs b/httpret/src/lib.rs
index 93a0854..68a53ea 100644
--- a/httpret/src/lib.rs
+++ b/httpret/src/lib.rs
@@ -331,7 +331,7 @@ async fn binned(req: Request<Body>, node_config: &NodeConfigCached) -> Result<Re
 
 async fn binned_binary(query: BinnedQuery, node_config: &NodeConfigCached) -> Result<Response<Body>, Error> {
     let ret = match disk::binned::binned_bytes_for_http(&query, node_config).await {
-        Ok(s) => response(StatusCode::OK).body(BodyStream::wrapped(s, format!("desc-BINNED")))?,
+        Ok(s) => response(StatusCode::OK).body(BodyStream::wrapped(s, format!("binned_binary")))?,
         Err(e) => {
             if query.report_error() {
                 response(StatusCode::INTERNAL_SERVER_ERROR).body(Body::from(format!("{:?}", e)))?
@@ -346,10 +346,7 @@ async fn binned_binary(query: BinnedQuery, node_config: &NodeConfigCached) -> Re
 
 async fn binned_json(query: BinnedQuery, node_config: &NodeConfigCached) -> Result<Response<Body>, Error> {
     let ret = match disk::binned::binned_json(node_config, &query).await {
-        Ok(val) => {
-            let body = serde_json::to_string(&val)?;
-            response(StatusCode::OK).body(Body::from(body))
-        }?,
+        Ok(s) => response(StatusCode::OK).body(BodyStream::wrapped(s, format!("binned_json")))?,
         Err(e) => {
             if query.report_error() {
                 response(StatusCode::INTERNAL_SERVER_ERROR).body(Body::from(format!("{:?}", e)))?