@hpriyalal,
Labels are shown at every interval of the axis. To avoid overlapping, chart skips alternative labels which can be overridden by setting interval property. Incase of date-time axis, you may need to set intervalType along with interval according to your data, please refer documentation for more info and live examples.
If this doesn’t solve the issue you are facing, kindly create JSFiddle reproducing the issue and share it with us so that we can look into the code, understand the scenario better and help you out.
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Vishwas R
Team CanvasJS