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---
title: Data inspection
linkTitle: Inspection
description: Use template functions to inspect values and data structures.
categories: [troubleshooting]
keywords: []
menu:
docs:
parent: troubleshooting
weight: 40
weight: 40
---
Use the [`jsonify`] function to inspect a data structure:
```go-html-template
<pre>{{ jsonify (dict "indent" " ") .Params }}</pre>
```
```text
{
"date": "2023-11-10T15:10:42-08:00",
"draft": false,
"iscjklanguage": false,
"lastmod": "2023-11-10T15:10:42-08:00",
"publishdate": "2023-11-10T15:10:42-08:00",
"tags": [
"foo",
"bar"
],
"title": "My first post"
}
```
{{% note %}}
Hugo will throw an error if you attempt to use the construct above to display context that includes a page collection. For example, in a home page template, this will fail:
`{{ jsonify (dict "indent" " ") . }}`
{{% /note %}}
Use the [`debug.Dump`] function to inspect data types:
```go-html-template
<pre>{{ debug.Dump .Params }}</pre>
```
```text
maps.Params{
"date": time.Time{},
"draft": false,
"iscjklanguage": false,
"lastmod": time.Time{},
"publishdate": time.Time{},
"tags": []string{
"foo",
"bar",
},
"title": "My first post",
}
```
Use the [`printf`] function (render) or [`warnf`] function (log to console) to inspect simple data structures. The layout string below displays both value and data type.
```go-html-template
{{ $value := 42 }}
{{ printf "%[1]v (%[1]T)" $value }} → 42 (int)
```
[`jsonify`]: /functions/encoding/jsonify
[`debug.Dump`]: /functions/debug/dump
[`printf`]: /functions/fmt/printf
[`warnf`]: /functions/fmt/warnf
|
