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troubleshooting-faq.md

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Frequently asked questions: troubleshooting

I am not getting an image file, what went wrong?

In case of any errors, the server will respond with an HTTP status code other than 200 OK (e.g. 400 Bad Request) and a short plain text message containing the reason for the error.

The server responds with "Post data is not valid JSON!", but I have posted only JSON. How can that be?

Note that there are some subtle differences between objects specified directly in JavaScript and valid JSON. For example, the plot data that could be specified in a JavaScript code snippet as

var data = [
  {
    x: ['2013-10-04 22:23:00', '2013-11-04 22:23:00', '2013-12-04 22:23:00'],
    y: [1, 3, 6],
    type: 'scatter'
  }
];

Plotly.newPlot('myDiv', data);

corresponds to the following JSON to generate the same plot on the export server:

{
  "x": ["2013-10-04 22:23:00", "2013-11-04 22:23:00", "2013-12-04 22:23:00"],
  "y": [1, 3, 6],
  "type": "scatter"
}

The notable differences are:

  • no array brackets around the data (an array is not an object in the sense of JavaScript Object Notation)
  • no single quote string delimiters, only double quotes are valid string delimiters in JSON
  • names of object members in JSON have to be enclosed in double quotes, too, e.g. y: [1,3,6] becomes "y": [1,3,6]

The image I get just contains axis but no plot data. Why?

If the image looks something like this, ...

Empty plot

... then it is due to the fact that the specified plot data is not the way that Plotly.js expects it to be. In other words, there is in error in the specified data. (The export server does not detect such mistakes, because it only checks whether the data is valid JSON.) The simplest case would be that the data is just empty, and therefore nothing is rendered. You might want to check the Ploty examples to get an idea what data Plotly.js requires to render certain kinds of plots. Playing around with the plot data on CodePen might also be a way to figure out the correct data format.