Man page - bson_json_reader_t(3)

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Manual

BSON_JSON_READER_T(3) libbson BSON_JSON_READER_T(3)

Bulk JSON to BSON conversion

#include <bson/bson.h>
typedef struct _bson_json_reader_t bson_json_reader_t;
typedef enum {


   BSON_JSON_ERROR_READ_CORRUPT_JS = 1,


   BSON_JSON_ERROR_READ_INVALID_PARAM,


   BSON_JSON_ERROR_READ_CB_FAILURE,
} bson_json_error_code_t;


The bson_json_reader_t structure is used for reading a sequence of JSON documents and transforming them to bson_t documents.

This can often be useful if you want to perform bulk operations that are defined in a file containing JSON documents.

TIP:

bson_json_reader_t works upon JSON documents formatted in MongoDB extended JSON format.


/*


 * Copyright 2009-present MongoDB, Inc.


 *


 * Licensed under the Apache License, Version 2.0 (the "License");


 * you may not use this file except in compliance with the License.


 * You may obtain a copy of the License at


 *


 *   http://www.apache.org/licenses/LICENSE-2.0


 *


 * Unless required by applicable law or agreed to in writing, software


 * distributed under the License is distributed on an "AS IS" BASIS,


 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.


 * See the License for the specific language governing permissions and


 * limitations under the License.


 */
/*


 * This program will print each JSON document contained in the provided files


 * as a BSON string to STDOUT.


 */
#include <bson/bson.h>
#include <stdlib.h>
#include <stdio.h>
int
main (int argc, char *argv[])
{


   bson_json_reader_t *reader;


   bson_error_t error;


   const char *filename;


   bson_t doc = BSON_INITIALIZER;


   int i;


   int b;


   /*


    * Print program usage if no arguments are provided.


    */


   if (argc == 1) {


      fprintf (stderr, "usage: %s FILE...\n", argv[0]);


      return 1;


   }


   /*


    * Process command line arguments expecting each to be a filename.


    */


   for (i = 1; i < argc; i++) {


      filename = argv[i];


      /*


       * Open the filename provided in command line arguments.


       */


      if (0 == strcmp (filename, "-")) {


         reader = bson_json_reader_new_from_fd (STDIN_FILENO, false);


      } else {


         if (!(reader = bson_json_reader_new_from_file (filename, &error))) {


            fprintf (


               stderr, "Failed to open \"%s\": %s\n", filename, error.message);


            continue;


         }


      }


      /*


       * Convert each incoming document to BSON and print to stdout.


       */


      while ((b = bson_json_reader_read (reader, &doc, &error))) {


         if (b < 0) {


            fprintf (stderr, "Error in json parsing:\n%s\n", error.message);


            abort ();


         }


         if (fwrite (bson_get_data (&doc), 1, doc.len, stdout) != doc.len) {


            fprintf (stderr, "Failed to write to stdout, exiting.\n");


            exit (1);


         }


         bson_reinit (&doc);


      }


      bson_json_reader_destroy (reader);


      bson_destroy (&doc);


   }


   return 0;
}


MongoDB, Inc

2009-present, MongoDB, Inc.

December 18, 2025 1.30.4