# HDF5.jl with vector of tuples of strings

**URL:** <https://discourse.julialang.org/t/hdf5-jl-with-vector-of-tuples-of-strings/139148>\
**Category:** Data\
**Tags:** hdf5\
**Created:** [September 1, 2026, 9:41pm UTC](https://discourse.julialang.org/t/hdf5-jl-with-vector-of-tuples-of-strings/139148 "2026-09-01T21:41:39Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![BambOoxX](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/bambooxx/32/22179_2.png) [@BambOoxX](https://discourse.julialang.org/u/BambOoxX)\
**Post date:** [September 1, 2026, 9:41pm UTC](https://discourse.julialang.org/t/hdf5-jl-with-vector-of-tuples-of-strings/139148/1 "2026-09-01T21:41:39Z")

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@mkitti I just stumbled on another similar string related issue. If one tries to write a `Vector{@NamedTuple...}` where at least one type is a string, the writing fails.  
This is on v0.17.3.

```julia
using HDF5

arr = [
       (;A="A",B=1),
       (;A="A",B=2)
       ]
 h5write("test.h5", "test", arr)

```

> ERROR: ArgumentError: Could not convert non-bitstype @NamedTuple{A::String, B::Int64} to @NamedTuple{A::HDF5.FixedString{1, 0}, B::Int64} for writing to HDF5. Consider implementing `convert(::Type{@NamedTuple{A::HDF5.FixedString{1, 0}, B::Int64}}, ::@NamedTuple{A::String, B::Int64})`

The funny thing if that these arrays are actually the output of `h5read`…  
I can open an issue on github if you prefer, but this felt pretty related to the OP.

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**Author:** ![mkitti](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mkitti/32/12459_2.png) [@mkitti](https://discourse.julialang.org/u/mkitti)\
**Post date:** [September 1, 2026, 9:43pm UTC](https://discourse.julialang.org/t/hdf5-jl-with-vector-of-tuples-of-strings/139148/2 "2026-09-01T21:43:45Z")

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Please create an issue. It is difficult to track these things here.

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**Author:** ![stevengj](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/stevengj/32/71_2.png) [@stevengj](https://discourse.julialang.org/u/stevengj)\
**Post date:** [September 1, 2026, 9:50pm UTC](https://discourse.julialang.org/t/hdf5-jl-with-vector-of-tuples-of-strings/139148/3 "2026-09-01T21:50:35Z")

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(I’ve moved this to a new topic. Please don’t post to ancient threads, especially with replies that are only tangentially related to to the topic of the old thread.)

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**Author:** ![mkitti](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mkitti/32/12459_2.png) [@mkitti](https://discourse.julialang.org/u/mkitti)\
**Post date:** [September 1, 2026, 9:55pm UTC](https://discourse.julialang.org/t/hdf5-jl-with-vector-of-tuples-of-strings/139148/4 "2026-09-01T21:55:11Z")

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Github Issue: [Writing a Vector{@NamedTuple} containing String field(s) fails · Issue #1239 · JuliaIO/HDF5.jl · GitHub](https://github.com/JuliaIO/HDF5.jl/issues/1239)

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**Author:** ![BambOoxX](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/bambooxx/32/22179_2.png) [@BambOoxX](https://discourse.julialang.org/u/BambOoxX)\
**Post date:** [September 2, 2026, 7:25am UTC](https://discourse.julialang.org/t/hdf5-jl-with-vector-of-tuples-of-strings/139148/5 "2026-09-02T07:25:32Z")

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Thanks, my bad.