---
name: "Mojo::JSON"
section: "3pm"
platform: "linux"
package: "libmojolicious-perl"
version: "9.39+dfsg-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Mojo::JSON"
---

# Mojo::JSON(3pm)

Minimalistic JSON

## NAME

Mojo::JSON - Minimalistic JSON

## SYNOPSIS

```
  use Mojo::JSON qw(decode_json encode_json);
  my $bytes = encode_json {foo => [1, 2], bar => 'hello!', baz => \1};
  my $hash  = decode_json $bytes;
```

## DESCRIPTION

Mojo::JSON is a minimalistic and possibly the fastest pure-Perl implementation of RFC 8259 \<https://tools.ietf.org/html/rfc8259\>.

It supports normal Perl data types like scalar, array reference, hash reference and will try to call the `"TO_JSON"` method on blessed references, or stringify them if it doesn't exist. Differentiating between strings and numbers in Perl is hard, depending on how it has been used, a scalar can be both at the same time. The string value has a higher precedence unless both representations are equivalent.

```
  [1, -2, 3]     -> [1, -2, 3]
  {"foo": "bar"} -> {foo => 'bar'}
```

Literal names will be translated to and from Mojo::JSON constants or a similar native Perl value.

```
  true  -> Mojo::JSON->true
  false -> Mojo::JSON->false
  null  -> undef
```

In addition scalar references will be used to generate booleans, based on if their values are true or false.

```
  \1 -> true
  \0 -> false
```

The character `"/"` will always be escaped to prevent XSS attacks.

```
  "</script>" -> "<\/script>"
```

For better performance the optional module Cpanel::JSON::XS (4.09+) will be used automatically if possible. This can also be disabled with the `"MOJO_NO_JSON_XS"` environment variable.

## FUNCTIONS

Mojo::JSON implements the following functions, which can be imported individually.

### decode\_json

```
  my $value = decode_json $bytes;
```

Decode JSON to Perl value and die if decoding fails.

### encode\_json

```
  my $bytes = encode_json {i => '♥ mojolicious'};
```

Encode Perl value to JSON.

### false

```
  my $false = false;
```

False value, used because Perl has no native equivalent.

### from\_json

```
  my $value = from_json $chars;
```

Decode JSON text that is not `"UTF-8"` encoded to Perl value and die if decoding fails.

### j

```
  my $bytes = j [1, 2, 3];
  my $bytes = j {i => '♥ mojolicious'};
  my $value = j $bytes;
```

Encode Perl data structure (which may only be an array reference or hash reference) or decode JSON, an `"undef"` return value indicates a bare `"null"` or that decoding failed.

### to\_json

```
  my $chars = to_json {i => '♥ mojolicious'};
```

Encode Perl value to JSON text without `"UTF-8"` encoding it.

### true

```
  my $true = true;
```

True value, used because Perl has no native equivalent.

## SEE ALSO

Mojolicious, Mojolicious::Guides, \<https://mojolicious.org\>.