'\"
'\" Generated from file 'json\&.man' by tcllib/doctools with format 'nroff'
'\" Copyright (c) 2006 ActiveState Software Inc\&.
'\" Copyright (c) 2009 Thomas Maeder, Glue Software Engineering AG
'\"
.TH "json" 3tcl 1\&.3\&.4 tcllib "JSON"
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.BS
.SH NAME
json \- JSON parser
.SH SYNOPSIS
package require \fBTcl  8\&.4\fR
.sp
package require \fBjson  ?1\&.3\&.4?\fR
.sp
\fB::json::json2dict\fR \fItxt\fR
.sp
\fB::json::many-json2dict\fR \fItxt\fR ?\fImax\fR?
.sp
.BE
.SH DESCRIPTION
.PP
The \fBjson\fR package provides a simple Tcl-only library for parsing the
JSON \fIhttp://www\&.json\&.org/\fR data exchange format as specified in RFC 4627
\fIhttp://www\&.ietf\&.org/rfc/rfc4627\&.txt\fR\&.
There is some ambiguity in parsing JSON because JSON has type information that
is not maintained by the Tcl conversion\&.  The \fBjson\fR package returns
data as a Tcl \fBdict\fR\&.  Either the \fBdict\fR package or Tcl 8\&.5 is
required for use\&.
.SH COMMANDS
.TP
\fB::json::json2dict\fR \fItxt\fR
Parse JSON formatted text \fItxt\fR into a Tcl dict and return
the value\&.
.sp
If \fItxt\fR contains more than one JSON entity only the
first one is returned\&.
.TP
\fB::json::many-json2dict\fR \fItxt\fR ?\fImax\fR?
Parse JSON formatted text \fItxt\fR containing multiple JSON entities
into a list of dictionaries and return that list\&.
.sp
If \fImax\fR is specified exactly that many entities are extracted
from \fItxt\fR\&. By default the command will attempt to extract all, without
limits\&. A value of "\fImax\fR == 0" does not make sense and will cause the
command to throw an error\&.
.PP
.PP
.SH EXAMPLES
.PP
An example of a JSON array converted to Tcl\&.  A JSON array is returned as a
single item with multiple elements\&.
.PP
.CS

[
    {
       "precision": "zip",
       "Latitude":  37\&.7668,
       "Longitude": -122\&.3959,
       "Address":   "",
       "City":      "SAN FRANCISCO",
       "State":     "CA",
       "Zip":       "94107",
       "Country":   "US"
    },
    {
       "precision": "zip",
       "Latitude":  37\&.371991,
       "Longitude": -122\&.026020,
       "Address":   "",
       "City":      "SUNNYVALE",
       "State":     "CA",
       "Zip":       "94085",
       "Country":   "US"
    }
]
=>
{Country US Latitude 37\&.7668 precision zip State CA City {SAN FRANCISCO} Address {} Zip 94107 Longitude -122\&.3959} {Country US Latitude 37\&.371991 precision zip State CA City SUNNYVALE Address {} Zip 94085 Longitude -122\&.026020}

.CE
.PP
An example of a JSON object converted to Tcl\&.  A JSON object is returned as a
multi-element list (a dict)\&.
.PP
.CS

{
    "Image": {
        "Width":  800,
        "Height": 600,
        "Title":  "View from 15th Floor",
        "Thumbnail": {
            "Url":    "http://www\&.example\&.com/image/481989943",
            "Height": 125,
            "Width":  "100"
        },
        "IDs": [116, 943, 234, 38793]
    }
}
=>
Image {IDs {116 943 234 38793} Thumbnail {Width 100 Height 125 Url http://www\&.example\&.com/image/481989943} Width 800 Height 600 Title {View from 15th Floor}}

.CE
.SH RELATED
To write json, instead of parsing it, see package \fBjson::write\fR\&.
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems\&.
Please report such in the category \fIjson\fR of the
\fITcllib Trackers\fR [http://core\&.tcl\&.tk/tcllib/reportlist]\&.
Please also report any ideas for enhancements you may have for either
package and/or documentation\&.
.PP
When proposing code changes, please provide \fIunified diffs\fR,
i\&.e the output of \fBdiff -u\fR\&.
.PP
Note further that \fIattachments\fR are strongly preferred over
inlined patches\&. Attachments can be made by going to the \fBEdit\fR
form of the ticket immediately after its creation, and then using the
left-most button in the secondary navigation bar\&.
.SH KEYWORDS
data exchange, exchange format, javascript, json
.SH CATEGORY
CGI programming
.SH COPYRIGHT
.nf
Copyright (c) 2006 ActiveState Software Inc\&.
Copyright (c) 2009 Thomas Maeder, Glue Software Engineering AG

.fi