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diff --git a/src/bank-lib/bank_api_json.h b/src/bank-lib/bank_api_json.h
new file mode 100644
index 000000000..2ecaf8ef1
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+++ b/src/bank-lib/bank_api_json.h
@@ -0,0 +1,352 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2014, 2015 GNUnet e.V.
+
+  TALER is free software; you can redistribute it and/or modify it under the
+  terms of the GNU Affero General Public License as published by the Free Software
+  Foundation; either version 3, or (at your option) any later version.
+
+  TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details.
+
+  You should have received a copy of the GNU Affero General Public License along with
+  TALER; see the file COPYING.  If not, If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file mint-lib/mint_api_json.h
+ * @brief functions to parse incoming requests (JSON snippets)
+ * @author Florian Dold
+ * @author Benedikt Mueller
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <gnunet/gnunet_util_lib.h>
+#include "taler_util.h"
+#include <jansson.h>
+
+
+/**
+ * Enumeration with the various commands for the
+ * #BAJ_parse_json interpreter.
+ */
+enum BAJ_Command
+{
+
+  /**
+   * End of command list.
+   */
+  BAJ_CMD_END,
+
+  /**
+   * Parse amount at current position.
+   */
+  BAJ_CMD_AMOUNT,
+
+  /**
+   * Parse absolute time at current position.
+   */
+  BAJ_CMD_TIME_ABSOLUTE,
+
+  /**
+   * Parse fixed binary value at current position.
+   */
+  BAJ_CMD_BINARY_FIXED,
+
+  /**
+   * Parse variable-size binary value at current position.
+   */
+  BAJ_CMD_BINARY_VARIABLE,
+
+  /**
+   * Parse RSA public key at current position.
+   */
+  BAJ_CMD_RSA_PUBLIC_KEY,
+
+  /**
+   * Parse RSA signature at current position.
+   */
+  BAJ_CMD_RSA_SIGNATURE,
+
+  /**
+   * Parse `const char *` JSON string at current position.
+   */
+  BAJ_CMD_STRING,
+
+  /**
+   * Parse `uint16_t` integer at the current position.
+   */
+  BAJ_CMD_UINT16,
+
+  /**
+   * Parse `uint64_t` integer at the current position.
+   */
+  BAJ_CMD_UINT64,
+
+  /**
+   * Parse JSON object at the current position.
+   */
+  BAJ_CMD_JSON_OBJECT,
+
+  /**
+   * Parse ??? at current position.
+   */
+  BAJ_CMD_C
+
+};
+
+
+/**
+ * @brief Entry in parser specification for #BAJ_parse_json.
+ */
+struct BAJ_Specification
+{
+
+  /**
+   * Command to execute.
+   */
+  enum BAJ_Command cmd;
+
+  /**
+   * Name of the field to access.
+   */
+  const char *field;
+
+  /**
+   * Further details for the command.
+   */
+  union {
+
+    /**
+     * Where to store amount for #BAJ_CMD_AMOUNT.
+     */
+    struct TALER_Amount *amount;
+
+    /**
+     * Where to store time, for #BAJ_CMD_TIME_ABSOLUTE.
+     */
+    struct GNUNET_TIME_Absolute *abs_time;
+
+    /**
+     * Where to write binary data, for #BAJ_CMD_BINARY_FIXED.
+     */
+    struct {
+      /**
+       * Where to write the data.
+       */
+      void *dest;
+
+      /**
+       * How many bytes to write to @e dest.
+       */
+      size_t dest_size;
+
+    } fixed_data;
+
+    /**
+     * Where to write binary data, for #BAJ_CMD_BINARY_VARIABLE.
+     */
+    struct {
+      /**
+       * Where to store the pointer with the data (is allocated).
+       */
+      void **dest_p;
+
+      /**
+       * Where to store the number of bytes allocated at `*dest`.
+       */
+      size_t *dest_size_p;
+
+    } variable_data;
+
+    /**
+     * Where to store the RSA public key for #BAJ_CMD_RSA_PUBLIC_KEY
+     */
+    struct GNUNET_CRYPTO_rsa_PublicKey **rsa_public_key;
+
+    /**
+     * Where to store the RSA signature for #BAJ_CMD_RSA_SIGNATURE
+     */
+    struct GNUNET_CRYPTO_rsa_Signature **rsa_signature;
+
+    /**
+     * Details for #BAJ_CMD_EDDSA_SIGNATURE
+     */
+    struct {
+
+      /**
+       * Where to store the purpose.
+       */
+      struct GNUNET_CRYPTO_EccSignaturePurpose **purpose_p;
+
+      /**
+       * Key to verify the signature against.
+       */
+      const struct GNUNET_CRYPTO_EddsaPublicKey *pub_key;
+
+    } eddsa_signature;
+
+    /**
+     * Where to store a pointer to the string.
+     */
+    const char **strptr;
+
+    /**
+     * Where to store 16-bit integer.
+     */
+    uint16_t *u16;
+
+    /**
+     * Where to store 64-bit integer.
+     */
+    uint64_t *u64;
+
+    /**
+     * Where to store a JSON object.
+     */
+    json_t **obj;
+
+  } details;
+
+};
+
+
+/**
+ * Navigate and parse data in a JSON tree.
+ *
+ * @param root the JSON node to start the navigation at.
+ * @param spec parse specification array
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
+ */
+int
+BAJ_parse_json (const json_t *root,
+                struct BAJ_Specification *spec);
+
+
+/**
+ * Free all elements allocated during a
+ * #BAJ_parse_json() operation.
+ *
+ * @param spec specification of the parse operation
+ */
+void
+BAJ_parse_free (struct BAJ_Specification *spec);
+
+
+/**
+ * End of a parser specification.
+ */
+#define BAJ_spec_end { .cmd = BAJ_CMD_END }
+
+/**
+ * Fixed size object (in network byte order, encoded using Crockford
+ * Base32hex encoding).
+ *
+ * @param name name of the JSON field
+ * @param obj pointer where to write the data (type of `*obj` will determine size)
+ */
+#define BAJ_spec_fixed_auto(name,obj) { .cmd = BAJ_CMD_BINARY_FIXED, .field = name, .details.fixed_data.dest = obj, .details.fixed_data.dest_size = sizeof (*obj) }
+
+
+/**
+ * Variable size object (in network byte order, encoded using Crockford
+ * Base32hex encoding).
+ *
+ * @param name name of the JSON field
+ * @param obj pointer where to write the data (a `void **`)
+ * @param size where to store the number of bytes allocated for @a obj (of type `size_t *`
+ */
+#define BAJ_spec_varsize(name,obj,size) { .cmd = BAJ_CMD_BINARY_VARIABLE, .field = name, .details.variable_data.dest_p = obj, .details.variable_data.dest_size_p = size }
+
+
+/**
+ * The expected field stores a string.
+ *
+ * @param name name of the JSON field
+ * @param strptr where to store a pointer to the field
+ */
+struct BAJ_Specification
+BAJ_spec_string (const char *name,
+                 const char **strptr);
+
+
+/**
+ * Absolute time.
+ *
+ * @param name name of the JSON field
+ * @param[out] at where to store the absolute time found under @a name
+ */
+struct BAJ_Specification
+BAJ_spec_absolute_time (const char *name,
+                        struct GNUNET_TIME_Absolute *at);
+
+
+/**
+ * 16-bit integer.
+ *
+ * @param name name of the JSON field
+ * @param[out] u16 where to store the integer found under @a name
+ */
+struct BAJ_Specification
+BAJ_spec_uint16 (const char *name,
+                 uint16_t *u16);
+
+
+/**
+ * 64-bit integer.
+ *
+ * @param name name of the JSON field
+ * @param[out] u64 where to store the integer found under @a name
+ */
+struct BAJ_Specification
+BAJ_spec_uint64 (const char *name,
+                 uint64_t *u64);
+
+
+/**
+ * JSON object.
+ *
+ * @param name name of the JSON field
+ * @param[out] jsonp where to store the JSON found under @a name
+ */
+struct BAJ_Specification
+BAJ_spec_json (const char *name,
+               json_t **jsonp);
+
+
+/**
+ * Specification for parsing an amount value.
+ *
+ * @param name name of the JSON field
+ * @param amount where to store the amount under @a name
+ */
+struct BAJ_Specification
+BAJ_spec_amount (const char *name,
+                 struct TALER_Amount *amount);
+
+
+/**
+ * Specification for parsing an RSA public key.
+ *
+ * @param name name of the JSON field
+ * @param pk where to store the RSA key found under @a name
+ */
+struct BAJ_Specification
+BAJ_spec_rsa_public_key (const char *name,
+                         struct GNUNET_CRYPTO_rsa_PublicKey **pk);
+
+
+/**
+ * Specification for parsing an RSA signature.
+ *
+ * @param name name of the JSON field
+ * @param sig where to store the RSA signature found under @a name
+ */
+struct BAJ_Specification
+BAJ_spec_rsa_signature (const char *name,
+                        struct GNUNET_CRYPTO_rsa_Signature **sig);
+
+
+
+
+/* end of mint_api_json.h */