[Condenser] Fix issue with page not loading when json_metadata tags field contains an Array of Arrays

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[Condenser] Fix issue with page not loading when json_metadata tags field contains an Array of Arrays

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When a user submits a comment that has an Array of Arrays for the tags field, Condenser breaks due to expecting a single array.


When parsing the tags, concat the arrays together to create a single Array from the multiples if they exist.


Due to the fact that users are able to submit arbitrary data in the json_metadata field that Condenser parses, users are able to completely break their own account by submitting improperly formatted tags in the json_metadata. One user in particular @makafuigdzivenu encountered this issue and is unable to load any of his pages via Condenser. This pull request contains a quick solution to the problem by just concatenating multiple arrays in the tags field to just a single array.

Example Of Improperly Formatted JSON_METADATA

  • (tags should be an Array of strings)
    json_metadata: {
      tags: [['badtag']],
      app: 'testpost',
      community: 'testpost',
      format: 'markdown+html'

Shoutout to @ makafuigdzivenu for reporting the original issue on steemit/condenser


Improperly formatted tags breaking Condenser

screen shot 2018-01-17 at 1 15 06 pm

Improperly formatted tags concatenated into a single Array works fine

screen shot 2018-01-17 at 1 42 05 pm


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  ·  last month

Thank you for the contribution. It has been approved.

Nice work and a quick fix :)

You can contact us on Discord.

  ·  last month

Hey @reggaemuffin, I just gave you a tip for your hard work on moderation. Upvote this comment to support the utopian moderators and increase your future rewards!

  ·  last month

thanks for sharing very nice info @netuoso

  ·  last month

is that how someone can use more than 5 tags? put them in an array?

  ·  last month

You know there is no limit on tags on the blockchain right? The limits you experience are imposed by the various frontends.

  ·  last month

I didn't know that ':)
Than why the heck someone wants to use an array in the tags array???
Thanks for the reply.

  ·  last month

Well, I am glad you know what you are doing as it's all greek to me..lol

  ·  last month

Hey @netuoso I am @utopian-io. I have just upvoted you!


  • Seems like you contribute quite often. AMAZING!

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  ·  last month

many thanks @netuoso for your efforts and support!