User:Baxter.brad/Drafts/JSON File Type Examples

JSON File Type Examples
This page contains examples of the file types described in ../JSON_Document_Streaming_Proposal. The contents are much-truncated MARC-in-JSON records.

Object
This file contains a single JSON object.

{  "leader" : "02179cas  2200553 a 45e0", "fields" : [ {        "001" : "913380"      },      {         "245" : {            "subfields" : [ {                 "a" : "Current population reports." },              {                  "n" : "Series P-20," },              {                  "p" : "Population characteristics." }           ],            "ind1" : "0", "ind2" : "0" }     }   ] }

Collection
This file contains a collection of JSON objects.

[  {      "leader" : "02179cas  2200553 a 45e0", "fields" : [ {           "001" : "913380"         },         {            "245" : {               "subfields" : [ {                    "a" : "Current population reports." },                 {                     "n" : "Series P-20," },                 {                     "p" : "Population characteristics." }              ],               "ind1" : "0", "ind2" : "0" }        }      ]   },   {      "leader" : "01858cas  2200457 a 4500", "fields" : [ {           "001" : "913385"         },         {            "245" : {               "subfields" : [ {                    "a" : "Current population reports." },                 {                     "n" : "Series P-60," },                 {                     "p" : "Consumer income." }              ],               "ind1" : "0", "ind2" : "0" }        }      ]   },   {      "leader" : "01866cas  2200469 a 4500", "fields" : [ {           "001" : "1665454"         },         {            "245" : {               "subfields" : [ {                    "a" : "Physical review." },                 {                     "n" : "A," },                 {                     "p" : "Atomic, molecular, and optical physics" },                 {                     "h" : "[electronic resource]." }              ],               "ind1" : "0", "ind2" : "0" }        }      ]   },   {      "leader" : "02267cas  2200517 a 45e0", "fields" : [ {           "001" : "1665455"         },         {            "245" : {               "subfields" : [ {                    "a" : "Physical review." },                 {                     "n" : "B," },                 {                     "p" : "Condensed matter" },                 {                     "h" : "[electronic resource]." }              ],               "ind1" : "0", "ind2" : "0" }        }      ]   },   {      "leader" : "01121nam  2200301 a 4500", "fields" : [ {           "001" : "1665456"         },         {            "245" : {               "subfields" : [ {                    "a" : "America and the British Labour Party :" },                 {                     "b" : "the \"special relationship\" at work /" },                 {                     "c" : "Peter Jones." }              ],               "ind1" : "1", "ind2" : "0" }        }      ]   } ]

Collection-Delimited
This file also contains a collection of JSON objects. The objects are separated from each other by a blank line, as indicated by the fact that there is a blank line after the initial "[" line.

The difference in the indentation from the example above is an artifact of how the file was created. The "collection" file above was generated in one call to the JSON emitter. This "collection-delimited" file was generated by printing "[\n\n" to the file and then calling the JSON emitter for each JSON object. Each object was then written to the file with a blank line after it. Each object except the last one also had a comma added to the end. Finally "]\n" was printed to the file.

I'm expecting JSON emitters to adopt this format as an option, assuming the format is adopted. :-) In that case, the indentation would probably be more like above.

[

{  "leader" : "02179cas  2200553 a 45e0", "fields" : [ {        "001" : "913380"      },      {         "245" : {            "subfields" : [ {                 "a" : "Current population reports." },              {                  "n" : "Series P-20," },              {                  "p" : "Population characteristics." }           ],            "ind1" : "0", "ind2" : "0" }     }   ] },

{  "leader" : "01858cas  2200457 a 4500", "fields" : [ {        "001" : "913385"      },      {         "245" : {            "subfields" : [ {                 "a" : "Current population reports." },              {                  "n" : "Series P-60," },              {                  "p" : "Consumer income." }           ],            "ind1" : "0", "ind2" : "0" }     }   ] },

{  "leader" : "01866cas  2200469 a 4500", "fields" : [ {        "001" : "1665454"      },      {         "245" : {            "subfields" : [ {                 "a" : "Physical review." },              {                  "n" : "A," },              {                  "p" : "Atomic, molecular, and optical physics" },              {                  "h" : "[electronic resource]." }           ],            "ind1" : "0", "ind2" : "0" }     }   ] },

{  "leader" : "02267cas  2200517 a 45e0", "fields" : [ {        "001" : "1665455"      },      {         "245" : {            "subfields" : [ {                 "a" : "Physical review." },              {                  "n" : "B," },              {                  "p" : "Condensed matter" },              {                  "h" : "[electronic resource]." }           ],            "ind1" : "0", "ind2" : "0" }     }   ] },

{  "leader" : "01121nam  2200301 a 4500", "fields" : [ {        "001" : "1665456"      },      {         "245" : {            "subfields" : [ {                 "a" : "America and the British Labour Party :" },              {                  "b" : "the \"special relationship\" at work /" },              {                  "c" : "Peter Jones." }           ],            "ind1" : "1", "ind2" : "0" }     }   ] }

]

Delimited
This file contains multiple JSON objects concatenated together. The file begins with a blank line, and there is a blank line between the objects.

Notice that there isn't a comma at the end of the objects. This should be considered the normal case, but a smart parser should probably look to see if there is a comma.

{  "leader" : "02179cas  2200553 a 45e0", "fields" : [ {        "001" : "913380"      },      {         "245" : {            "subfields" : [ {                 "a" : "Current population reports." },              {                  "n" : "Series P-20," },              {                  "p" : "Population characteristics." }           ],            "ind1" : "0", "ind2" : "0" }     }   ] }

{  "leader" : "01858cas  2200457 a 4500", "fields" : [ {        "001" : "913385"      },      {         "245" : {            "subfields" : [ {                 "a" : "Current population reports." },              {                  "n" : "Series P-60," },              {                  "p" : "Consumer income." }           ],            "ind1" : "0", "ind2" : "0" }     }   ] }

{  "leader" : "01866cas  2200469 a 4500", "fields" : [ {        "001" : "1665454"      },      {         "245" : {            "subfields" : [ {                 "a" : "Physical review." },              {                  "n" : "A," },              {                  "p" : "Atomic, molecular, and optical physics" },              {                  "h" : "[electronic resource]." }           ],            "ind1" : "0", "ind2" : "0" }     }   ] }

{  "leader" : "02267cas  2200517 a 45e0", "fields" : [ {        "001" : "1665455"      },      {         "245" : {            "subfields" : [ {                 "a" : "Physical review." },              {                  "n" : "B," },              {                  "p" : "Condensed matter" },              {                  "h" : "[electronic resource]." }           ],            "ind1" : "0", "ind2" : "0" }     }   ] }

{  "leader" : "01121nam  2200301 a 4500", "fields" : [ {        "001" : "1665456"      },      {         "245" : {            "subfields" : [ {                 "a" : "America and the British Labour Party :" },              {                  "b" : "the \"special relationship\" at work /" },              {                  "c" : "Peter Jones." }           ],            "ind1" : "1", "ind2" : "0" }     }   ] }

This file also contains multiple JSON objects concatenated together, like the file above. But this file begins with a line that contains "---\n", and there is a copy of that line between the objects.

Notice that the file ends with a copy of that line, too. This should be considered the normal case (just as the last line of a text file would normally end in a newline), but a parser should handle the case where there isn't anything after the last object.

--- {  "leader" : "02179cas  2200553 a 45e0", "fields" : [ {        "001" : "913380"      },      {         "245" : {            "subfields" : [ {                 "a" : "Current population reports." },              {                  "n" : "Series P-20," },              {                  "p" : "Population characteristics." }           ],            "ind1" : "0", "ind2" : "0" }     }   ] } --- {   "leader" : "01858cas  2200457 a 4500", "fields" : [ {        "001" : "913385"      },      {         "245" : {            "subfields" : [ {                 "a" : "Current population reports." },              {                  "n" : "Series P-60," },              {                  "p" : "Consumer income." }           ],            "ind1" : "0", "ind2" : "0" }     }   ] } --- {   "leader" : "01866cas  2200469 a 4500", "fields" : [ {        "001" : "1665454"      },      {         "245" : {            "subfields" : [ {                 "a" : "Physical review." },              {                  "n" : "A," },              {                  "p" : "Atomic, molecular, and optical physics" },              {                  "h" : "[electronic resource]." }           ],            "ind1" : "0", "ind2" : "0" }     }   ] } --- {   "leader" : "02267cas  2200517 a 45e0", "fields" : [ {        "001" : "1665455"      },      {         "245" : {            "subfields" : [ {                 "a" : "Physical review." },              {                  "n" : "B," },              {                  "p" : "Condensed matter" },              {                  "h" : "[electronic resource]." }           ],            "ind1" : "0", "ind2" : "0" }     }   ] } --- {   "leader" : "01121nam  2200301 a 4500", "fields" : [ {        "001" : "1665456"      },      {         "245" : {            "subfields" : [ {                 "a" : "America and the British Labour Party :" },              {                  "b" : "the \"special relationship\" at work /" },              {                  "c" : "Peter Jones." }           ],            "ind1" : "1", "ind2" : "0" }     }   ] } ---

NDJ
This file contains multiple JSON objects concatenated together, and each object must fit on a single line.

Unlike the other types, the file itself can't inform you what type it is. This is because the file begins with a brace,, so the first assumption is that it's file type 'object'. It is up to an outside agency to inform you what type it is, e.g., via a MIME type indicator.

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P-20, Popul. char."}],"ind1":"0","ind2":" "}},{"222":{"subfields":[{"a":"Current population reports. Series P-20, Population characteristics"}],"ind1":" ","ind2":"0"}},{"245":{"subfields":[{"a":"Current population reports."},{"n":"Series P-20,"},{"p":"Population characteristics."}],"ind1":"0","ind2":"0"}},{"246":{"subfields":[{"a":"Population characteristics"}],"ind1":"1","ind2":"0"}},{"260":{"subfields":[{"a":"[Washington, D.C.] :"},{"b":"U.S. Dept. of Commerce, Bureau of the Census :"},{"b":"For sale by the Supt. of Docs., U.S. G.P.O.,"}],"ind1":" ","ind2":" "}},{"265":{"subfields":[{"a":"Supt. of Docs., U.S. Govt. Print. Off., Washington, DC 20402"}],"ind1":" ","ind2":" "}},{"300":{"subfields":[{"a":"v. :"},{"b":"ill., maps ;"},{"c":"27 cm."}],"ind1":" ","ind2":" "}},{"362":{"subfields":[{"a":"Began with No. 1."}],"ind1":"1","ind2":" "}},{"500":{"subfields":[{"a":"Description based on: No. 352."}],"ind1":" ","ind2":" "}},{"500":{"subfields":[{"a":"Prior to January 1976 issues were classified C 56.218:P-20/(nos.)"}],"ind1":" ","ind2":" "}},{"510":{"subfields":[{"a":"Population index"},{"x":"0032-4701"}],"ind1":"2","ind2":" "}},{"510":{"subfields":[{"a":"American statistics index"},{"x":"0091-1658"}],"ind1":"0","ind2":" "}},{"530":{"subfields":[{"a":"Some issues also available online via the World Wide Web, in PDF format."}],"ind1":" ","ind2":" "}},{"651":{"subfields":[{"a":"United States"},{"x":"Population"},{"v":"Statistics"},{"v":"Periodicals."}],"ind1":" ","ind2":"0"}},{"710":{"subfields":[{"a":"United States."},{"b":"Bureau of the Census."}],"ind1":"1","ind2":" "}},{"740":{"subfields":[{"a":"Population-special subjects."}],"ind1":"0","ind2":" "}},{"780":{"subfields":[{"t":"Current population reports. Series P-27, Farm population"},{"x":"1048-6283"},{"w":"(DLC)sf 87037999"},{"w":"(OCoLC)7226532"}],"ind1":"0","ind2":"5"}},{"850":{"subfields":[{"a":"AU"},{"a":"DLC"},{"a":"InU"},{"a":"MH-KG"},{"a":"MH-PA"},{"a":"MH-SR"},{"a":"MdU"},{"a":"PU-W"}],"ind1":" ","ind2":" "}},{"856":{"subfields":[{"u":"http://www.census.gov/mp/www/pub/pop/mspop01.html"}],"ind1":"4","ind2":"1"}},{"891":{"subfields":[{"9":"853"},{"8":"1"},{"a":"no."},{"i":"(year)"}],"ind1":"0","ind2":"3"}},{"891":{"subfields":[{"9":"863"},{"8":"1"},{"a":" -"},{"i":" -"},{"x":"provisional"}],"ind1":"4","ind2":"0"}},{"936":{"subfields":[{"a":"No. 404 (Nov. 1985) LIC"}],"ind1":" ","ind2":" "}},{"994":{"subfields":[{"a":"E0"},{"b":"TXA"}],"ind1":" ","ind2":" "}}]} {"leader":"01858cas 2200457 a 4500","fields":[{"001":"913385"},{"005":"20030124101154.0"},{"008":"790313c19489999dcuuu1m      f0   a0eng  "},{"010":{"subfields":[{"a":"   52002108 //r822"}],"ind1":" ","ind2":" "}},{"019":{"subfields":[{"a":"01779114"},{"a":"07619124"},{"a":"11810351"}],"ind1":" ","ind2":" "}},{"022":{"subfields":[{"a":"0730-4803"}],"ind1":"0","ind2":" "}},{"035":{"subfields":[{"a":"(OCoLC)04738786"}],"ind1":" ","ind2":" "}},{"035":{"subfields":[{"9":"ADZ9248AM"}],"ind1":" ","ind2":" "}},{"035":{"subfields":[{"a":"913385"}],"ind1":" ","ind2":" "}},{"040":{"subfields":[{"a":"DLC"},{"c":"CPO"},{"d":"NLM"},{"d":"MUL"},{"d":"GPO"},{"d":"NSD"},{"d":"GPO"},{"d":"HUL"},{"d":"DLC"},{"d":"NST"},{"d":"DLC"},{"d":"NST"},{"d":"RCS"},{"d":"OCL"},{"d":"NSD"},{"d":"HUL"},{"d":"NST"},{"d":"DLC"},{"d":"OCL"},{"d":"NST"},{"d":"DLC"},{"d":"NST"},{"d":"MYG"},{"d":"TXA"}],"ind1":" ","ind2":" "}},{"042":{"subfields":[{"a":"nsdp"},{"a":"lc"}],"ind1":" ","ind2":" "}},{"043":{"subfields":[{"a":"n-us---"}],"ind1":" ","ind2":" "}},{"049":{"subfields":[{"a":"TXAO"}],"ind1":" ","ind2":" "}},{"050":{"subfields":[{"a":"HC110.I5"},{"b":"A53"}],"ind1":"0","ind2":"0"}},{"060":{"subfields":[{"a":"W2 A B9CUBM"}],"ind1":"0","ind2":" "}},{"069":{"subfields":[{"a":"C56641000"}],"ind1":"1","ind2":" "}},{"074":{"subfields":[{"a":"0142-C-07"}],"ind1":" ","ind2":" "}},{"082":{"subfields":[{"a":"339.2/2/0973"},{"2":"19"}],"ind1":"0","ind2":"0"}},{"086":{"subfields":[{"a":"C 3.186:P-60/"}],"ind1":"0","ind2":" "}},{"210":{"subfields":[{"a":"Curr. popul. rep., Ser. 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