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Unix tools are old school, some of those being written forty years ago. Let’s say I want to match all authors in the following JSON pattern: Sed is line oriented, and while it offers multi-line support, it’s no match for Perl. Let’s say we want to extract all “domain” related values: Let’s save the pretty printed JSON file and put other Unix tools to work. Python comes along with most Unix distributions, so running the following VIM command manages to do the trick: First, we will download a one-line JSON file from Reddit. Let’s see how easily you can pretty print a JSON file with VIM. Git interactive rebase uses VIM by default, so it’s worth knowing VIM. VIM, like many other Unix utilities, is both tough and brilliant. I’ve recently had to analyze a 100 MB one-line JSON file and once more VIM saved the day. There aren’t many editors capable of working with very large files, like production logs for instance. Sooner or later there comes the day when your easy-to-use IDE becomes useless for handling huge files. JSON separates array elements and key-value pairs with commas.Follow you are trading with Kraken or Revolut, then you are going to love If $enable is false (the default), then decode will only accept valid JSON texts.
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I suggest only to use this option to parse application-specific files written by humans (configuration files, resource files etc.) Be aware that this option makes you accept invalid JSON texts as if they were valid!. If $enable is true (or missing), then decode will accept some extensions to normal JSON syntax (see below). The mutators for flags all return the JSON::PP object again and thus calls can be chained: my $json = JSON::PP->new->utf8->space_after->encode( relaxed $json = $json->relaxed() All boolean flags described below are by default disabled (with the exception of allow_nonref, which defaults to enabled since version 4.0). new $json = JSON::PP->newĬreates a new JSON::PP object that can be used to de/encode JSON strings. The object oriented interface lets you configure your own encoding or decoding style, within the limits of supported formats. This section is also taken from JSON::XS. See MAPPING, below, for more information on how JSON values are mapped to Perl. Returns true if the passed scalar represents either JSON::PP::true or JSON::PP::false, two constants that act like 1 and 0 respectively and are also used to represent JSON true and false in Perl strings. JSON::PP::is_bool $is_boolean = JSON::PP::is_bool($scalar) This function call is functionally identical to: $perl_scalar = JSON::PP->new->utf8->decode($json_text)Įxcept being faster. The opposite of encode_json: expects an UTF-8 (binary) string and tries to parse that as an UTF-8 encoded JSON text, returning the resulting reference. decode_json $perl_scalar = decode_json $json_text This function call is functionally identical to: $json_text = JSON::PP->new->utf8->encode($perl_scalar)Įxcept being faster.
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encode_json $json_text = encode_json $perl_scalarĬonverts the given Perl data structure to a UTF-8 encoded, binary string (that is, the string contains octets only). encode_json and decode_json are exported by default. This section is taken from JSON::XS almost verbatim. JSON::PP has been in the Perl core since Perl 5.14, mainly for CPAN toolchain modules to parse META.json. If you need JavaScript-friendly RFC7159-compliant pure perl module, try JSON::Tiny, which is derived from Mojolicious web framework and is also smaller and faster than JSON::PP.
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not to escape extra characters such as U+2028 and U+2029, etc), in order for you not to lose such JavaScript-friendliness silently when you use JSON.pm and install JSON::XS for speed or by accident. JSON::PP works as a fallback module when you use JSON module without having installed JSON::XS.īecause of this fallback feature of JSON.pm, JSON::PP tries not to be more JavaScript-friendly than JSON::XS (i.e. JSON::PP is a pure perl JSON decoder/encoder, and (almost) compatible to much faster JSON::XS written by Marc Lehmann in C. # JSON::XS or JSON::PP, so you should be able to just: # Note that JSON version 2.0 and above will automatically use $perl_scalar = $json->decode( $json_text ) $pretty_printed_json_text = $json->encode( $perl_scalar ) $json = JSON::PP->new->ascii->pretty->allow_nonref $perl_hash_or_arrayref = decode_json $utf8_encoded_json_text $utf8_encoded_json_text = encode_json $perl_hash_or_arrayref # exported functions, they croak on error JSON::PP - JSON::XS compatible pure-Perl module.